Daily Leetcode in C++

My daily challenge on leetcode since 2021/09/06.

Questions List

### 1 ~ 250

</>	#	Solution Title	Difficulty
📎	1	Two Sum	Easy
📎	2	Add Two Numbers	Medium
📎	3	Longest Substring Without Repeating Characters	Medium
📎	4	Median of Two Sorted Arrays	Hard
📎	5	Longest Palindromic Substring	Medium
📎	6	Zigzag Conversion	Medium
📎	7	Reverse Integer	Medium
📎	8	String to Integer (atoi)	Medium
📎	9	Palindrome Number	Easy
📎	10	Regular Expression Matching	Hard
📎	11	Container With Most Water	Medium
📎	12	Integer to Roman	Medium
📎	13	Roman to Integer	Easy
📎	14	Longest Common Prefix	Easy
📎	15	3Sum	Medium
📎	16	3Sum Closest	Medium
📎	17	Letter Combinations of a Phone Number	Medium
📎	18	4Sum	Medium
📎	19	Remove Nth Node From End of List	Medium
📎	20	Valid Parentheses	Easy
📎	21	Merge Two Sorted Lists	Easy
📎	22	Generate Parentheses	Medium
📎	23	Merge k Sorted Lists	Hard
📎	24	Swap Nodes in Pairs	Medium
📎	25	Reverse Nodes in k-Group	Hard
📎	26	Remove Duplicates from Sorted Array	Easy
📎	27	Remove Element	Easy
📎	28	Find the Index of the First Occurrence in a String	Medium
📎	29	Divide Two Integers	Medium
📎	30	Substring with Concatenation of All Words	Hard
📎	31	Next Permutation	Medium
📎	32	Longest Valid Parentheses	Hard
📎	33	Search in Rotated Sorted Array	Medium
📎	34	Find First and Last Position of Element in Sorted Array	Medium
📎	35	Search Insert Position	Easy
📎	36	Valid Sudoku	Medium
📎	37	Sudoku Solver	Hard
📎	38	Count and Say	Medium
📎	39	Combination Sum	Medium
📎	40	Combination Sum II	Medium
📎	41	First Missing Positive	Hard
📎	42	Trapping Rain Water	Hard
📎	43	Multiply Strings	Medium
📎	44	Wildcard Matching	Hard
📎	45	Jump Game II	Medium
📎	46	Permutations	Medium
📎	47	Permutations II	Medium
📎	48	Rotate Image	Medium
📎	49	Group Anagrams	Medium
📎	50	Pow(x, n)	Medium
📎	51	N-Queens	Hard
📎	52	N-Queens II	Hard
📎	53	Maximum Subarray	Medium
📎	54	Spiral Matrix	Medium
📎	55	Jump Game	Medium
📎	56	Merge Intervals	Medium
📎	57	Insert Interval	Medium
📎	58	Length of Last Word	Easy
📎	59	Spiral Matrix II	Medium
📎	60	Permutation Sequence	Hard
📎	61	Rotate List	Medium
📎	62	Unique Paths	Medium
📎	63	Unique Paths II	Medium
📎	64	Minimum Path Sum	Medium
📎	65	Valid Number	Hard
📎	66	Plus One	Easy
📎	67	Add Binary	Easy
📎	68	Text Justification	Hard
📎	69	Sqrt(x)	Easy
📎	70	Climbing Stairs	Easy
📎	71	Simplify Path	Medium
📎	72	Edit Distance	Hard
📎	73	Set Matrix Zeroes	Medium
📎	74	Search a 2D Matrix	Medium
📎	75	Sort Colors	Medium
📎	76	Minimum Window Substring	Hard
📎	77	Combinations	Medium
📎	78	Subsets	Medium
📎	79	Word Search	Medium
📎	80	Remove Duplicates from Sorted Array II	Medium
📎	81	Search in Rotated Sorted Array II	Medium
📎	82	Remove Duplicates from Sorted List II	Medium
📎	83	Remove Duplicates from Sorted List	Easy
📎	84	Largest Rectangle in Histogram	Hard
📎	85	Maximal Rectangle	Hard
📎	86	Partition List	Medium
📎	87	Scramble String	Hard
📎	88	Merge Sorted Array	Easy
📎	89	Gray Code	Medium
📎	90	Subsets II	Medium
📎	91	Decode Ways	Medium
📎	92	Reverse Linked List II	Medium
📎	93	Restore IP Addresses	Medium
📎	94	Binary Tree Inorder Traversal	Easy
📎	95	Unique Binary Search Trees II	Medium
📎	96	Unique Binary Search Trees	Medium
📎	97	Interleaving String	Medium
📎	98	Validate Binary Search Tree	Medium
📎	99	Recover Binary Search Tree	Medium
📎	100	Same Tree	Easy
📎	101	Symmetric Tree	Easy
📎	102	Binary Tree Level Order Traversal	Medium
📎	103	Binary Tree Zigzag Level Order Traversal	Medium
📎	104	Maximum Depth of Binary Tree	Easy
📎	105	Construct Binary Tree from Preorder and Inorder Traversal	Medium
📎	106	Construct Binary Tree from Inorder and Postorder Traversal	Medium
	107	Binary Tree Level Order Traversal II	Medium
📎	108	Convert Sorted Array to Binary Search Tree	Easy
📎	109	Convert Sorted List to Binary Search Tree	Medium
📎	110	Balanced Binary Tree	Easy
📎	111	Minimum Depth of Binary Tree	Easy
📎	112	Path Sum	Easy
📎	113	Path Sum II	Medium
📎	114	Flatten Binary Tree to Linked List	Medium
📎	115	Distinct Subsequences	Hard
📎	116	Populating Next Right Pointers in Each Node	Medium
📎	117	Populating Next Right Pointers in Each Node II	Medium
📎	118	Pascal's Triangle	Easy
📎	119	Pascal's Triangle II	Easy
📎	120	Triangle	Medium
📎	121	Best Time to Buy and Sell Stock	Easy
📎	122	Best Time to Buy and Sell Stock II	Medium
📎	123	Best Time to Buy and Sell Stock III	Hard
📎	124	Binary Tree Maximum Path Sum	Hard
	125	Valid Palindrome	Easy
📎	126	Word Ladder II	Hard
📎	127	Word Ladder	Hard
📎	128	Longest Consecutive Sequence	Medium
📎	129	Sum Root to Leaf Numbers	Medium
📎	130	Surrounded Regions	Medium
📎	131	Palindrome Partitioning	Medium
	132	Palindrome Partitioning II	Hard
📎	133	Clone Graph	Medium
📎	134	Gas Station	Medium
📎	135	Candy	Hard
📎	136	Single Number	Easy
📎	137	Single Number II	Medium
📎	138	Copy List with Random Pointer	Medium
📎	139	Word Break	Medium
📎	140	Word Break II	Hard
📎	141	Linked List Cycle	Easy
📎	142	Linked List Cycle II	Medium
📎	143	Reorder List	Medium
📎	144	Binary Tree Preorder Traversal	Easy
📎	145	Binary Tree Postorder Traversal	Easy
📎	146	LRU Cache	Medium
📎	147	Insertion Sort List	Medium
📎	148	Sort List	Medium
📎	149	Max Points on a Line	Hard
📎	150	Evaluate Reverse Polish Notation	Medium
📎	151	Reverse Words in a String	Medium
📎	152	Maximum Product Subarray	Medium
📎	153	Find Minimum in Rotated Sorted Array	Medium
📎	154	Find Minimum in Rotated Sorted Array II	Hard
📎	155	Min Stack	Medium
🔒	156	Binary Tree Upside Down	Medium
🔒	157	Read N Characters Given Read4	Easy
🔒	158	Read N Characters Given read4 II - Call Multiple Times	Hard
🔒	159	Longest Substring with At Most Two Distinct Characters	Medium
📎	160	Intersection of Two Linked Lists	Easy
🔒	161	One Edit Distance	Medium
📎	162	Find Peak Element	Medium
🔒	163	Missing Ranges	Easy
	164	Maximum Gap	Hard
📎	165	Compare Version Numbers	Medium
📎	166	Fraction to Recurring Decimal	Medium
📎	167	Two Sum II - Input Array Is Sorted	Medium
	168	Excel Sheet Column Title	Easy
📎	169	Majority Element	Easy
🔒	170	Two Sum III - Data structure design	Easy
📎	171	Excel Sheet Column Number	Easy
	172	Factorial Trailing Zeroes	Medium
📎	173	Binary Search Tree Iterator	Medium
📎	174	Dungeon Game	Hard
	175	Combine Two Tables	Easy
	176	Second Highest Salary	Medium
	177	Nth Highest Salary	Medium
	178	Rank Scores	Medium
📎	179	Largest Number	Medium
	180	Consecutive Numbers	Medium
	181	Employees Earning More Than Their Managers	Easy
	182	Duplicate Emails	Easy
	183	Customers Who Never Order	Easy
	184	Department Highest Salary	Medium
	185	Department Top Three Salaries	Hard
🔒	186	Reverse Words in a String II	Medium
📎	187	Repeated DNA Sequences	Medium
📎	188	Best Time to Buy and Sell Stock IV	Hard
📎	189	Rotate Array	Medium
📎	190	Reverse Bits	Easy
📎	191	Number of 1 Bits	Easy
	192	Word Frequency	Medium
	193	Valid Phone Numbers	Easy
	194	Transpose File	Medium
	195	Tenth Line	Easy
	196	Delete Duplicate Emails	Easy
	197	Rising Temperature	Easy
📎	198	House Robber	Medium
📎	199	Binary Tree Right Side View	Medium
📎	200	Number of Islands	Medium
📎	201	Bitwise AND of Numbers Range	Medium
📎	202	Happy Number	Easy
📎	203	Remove Linked List Elements	Easy
	204	Count Primes	Medium
📎	205	Isomorphic Strings	Easy
📎	206	Reverse Linked List	Easy
📎	207	Course Schedule	Medium
📎	208	Implement Trie (Prefix Tree)	Medium
📎	209	Minimum Size Subarray Sum	Medium
📎	210	Course Schedule II	Medium
📎	211	Design Add and Search Words Data Structure	Medium
📎	212	Word Search II	Hard
📎	213	House Robber II	Medium
📎	214	Shortest Palindrome	Hard
📎	215	Kth Largest Element in an Array	Medium
📎	216	Combination Sum III	Medium
📎	217	Contains Duplicate	Easy
📎	218	The Skyline Problem	Hard
📎	219	Contains Duplicate II	Easy
📎	220	Contains Duplicate III	Hard
📎	221	Maximal Square	Medium
📎	222	Count Complete Tree Nodes	Medium
📎	223	Rectangle Area	Medium
📎	224	Basic Calculator	Hard
📎	225	Implement Stack using Queues	Easy
📎	226	Invert Binary Tree	Easy
📎	227	Basic Calculator II	Medium
📎	228	Summary Ranges	Easy
📎	229	Majority Element II	Medium
📎	230	Kth Smallest Element in a BST	Medium
📎	231	Power of Two	Easy
📎	232	Implement Queue using Stacks	Easy
	233	Number of Digit One	Hard
📎	234	Palindrome Linked List	Easy
📎	235	Lowest Common Ancestor of a Binary Search Tree	Medium
📎	236	Lowest Common Ancestor of a Binary Tree	Medium
	237	Delete Node in a Linked List	Medium
📎	238	Product of Array Except Self	Medium
	239	Sliding Window Maximum	Hard
📎	240	Search a 2D Matrix II	Medium
📎	241	Different Ways to Add Parentheses	Medium
📎	242	Valid Anagram	Easy
🔒	243	Shortest Word Distance	Easy
🔒	244	Shortest Word Distance II	Medium
🔒	245	Shortest Word Distance III	Medium
🔒	246	Strobogrammatic Number	Easy
🔒	247	Strobogrammatic Number II	Medium
🔒	248	Strobogrammatic Number III	Hard
🔒	249	Group Shifted Strings	Medium
🔒	250	Count Univalue Subtrees	Medium

### 251 ~ 500

</>	#	Solution Title	Difficulty
🔒	251	Flatten 2D Vector	Medium
🔒	252	Meeting Rooms	Easy
🔒	253	Meeting Rooms II	Medium
🔒	254	Factor Combinations	Medium
🔒	255	Verify Preorder Sequence in Binary Search Tree	Medium
🔒	256	Paint House	Medium
📎	257	Binary Tree Paths	Easy
📎	258	Add Digits	Easy
🔒	259	3Sum Smaller	Medium
📎	260	Single Number III	Medium
🔒	261	Graph Valid Tree	Medium
	262	Trips and Users	Hard
📎	263	Ugly Number	Easy
📎	264	Ugly Number II	Medium
🔒	265	Paint House II	Hard
🔒	266	Palindrome Permutation	Easy
🔒	267	Palindrome Permutation II	Medium
📎	268	Missing Number	Easy
🔒	269	Alien Dictionary	Hard
🔒	270	Closest Binary Search Tree Value	Easy
🔒	271	Encode and Decode Strings	Medium
🔒	272	Closest Binary Search Tree Value II	Hard
	273	Integer to English Words	Hard
	274	H-Index	Medium
📎	275	H-Index II	Medium
🔒	276	Paint Fence	Medium
🔒	277	Find the Celebrity	Medium
📎	278	First Bad Version	Easy
📎	279	Perfect Squares	Medium
🔒	280	Wiggle Sort	Medium
🔒	281	Zigzag Iterator	Medium
📎	282	Expression Add Operators	Hard
📎	283	Move Zeroes	Easy
📎	284	Peeking Iterator	Medium
🔒	285	Inorder Successor in BST	Medium
🔒	286	Walls and Gates	Medium
📎	287	Find the Duplicate Number	Medium
🔒	288	Unique Word Abbreviation	Medium
📎	289	Game of Life	Medium
📎	290	Word Pattern	Easy
🔒	291	Word Pattern II	Medium
📎	292	Nim Game	Easy
🔒	293	Flip Game	Easy
🔒	294	Flip Game II	Medium
📎	295	Find Median from Data Stream	Hard
🔒	296	Best Meeting Point	Hard
📎	297	Serialize and Deserialize Binary Tree	Hard
🔒	298	Binary Tree Longest Consecutive Sequence	Medium
📎	299	Bulls and Cows	Medium
📎	300	Longest Increasing Subsequence	Medium
	301	Remove Invalid Parentheses	Hard
🔒	302	Smallest Rectangle Enclosing Black Pixels	Hard
📎	303	Range Sum Query - Immutable	Easy
📎	304	Range Sum Query 2D - Immutable	Medium
🔒	305	Number of Islands II	Hard
	306	Additive Number	Medium
📎	307	Range Sum Query - Mutable	Medium
🔒	308	Range Sum Query 2D - Mutable	Hard
📎	309	Best Time to Buy and Sell Stock with Cooldown	Medium
📎	310	Minimum Height Trees	Medium
🔒	311	Sparse Matrix Multiplication	Medium
📎	312	Burst Balloons	Hard
	313	Super Ugly Number	Medium
🔒	314	Binary Tree Vertical Order Traversal	Medium
📎	315	Count of Smaller Numbers After Self	Hard
📎	316	Remove Duplicate Letters	Medium
📎	317	Shortest Distance from All Buildings	Hard
📎	318	Maximum Product of Word Lengths	Medium
	319	Bulb Switcher	Medium
🔒	320	Generalized Abbreviation	Medium
	321	Create Maximum Number	Hard
📎	322	Coin Change	Medium
🔒	323	Number of Connected Components in an Undirected Graph	Medium
	324	Wiggle Sort II	Medium
🔒	325	Maximum Size Subarray Sum Equals k	Medium
📎	326	Power of Three	Easy
	327	Count of Range Sum	Hard
📎	328	Odd Even Linked List	Medium
📎	329	Longest Increasing Path in a Matrix	Hard
	330	Patching Array	Hard
	331	Verify Preorder Serialization of a Binary Tree	Medium
	332	Reconstruct Itinerary	Hard
🔒	333	Largest BST Subtree	Medium
📎	334	Increasing Triplet Subsequence	Medium
	335	Self Crossing	Hard
📎	336	Palindrome Pairs	Hard
📎	337	House Robber III	Medium
📎	338	Counting Bits	Easy
🔒	339	Nested List Weight Sum	Medium
🔒	340	Longest Substring with At Most K Distinct Characters	Medium
📎	341	Flatten Nested List Iterator	Medium
📎	342	Power of Four	Easy
📎	343	Integer Break	Medium
📎	344	Reverse String	Easy
📎	345	Reverse Vowels of a String	Easy
🔒	346	Moving Average from Data Stream	Easy
📎	347	Top K Frequent Elements	Medium
🔒	348	Design Tic-Tac-Toe	Medium
📎	349	Intersection of Two Arrays	Easy
📎	350	Intersection of Two Arrays II	Easy
🔒	351	Android Unlock Patterns	Medium
📎	352	Data Stream as Disjoint Intervals	Hard
🔒	353	Design Snake Game	Medium
📎	354	Russian Doll Envelopes	Hard
📎	355	Design Twitter	Medium
🔒	356	Line Reflection	Medium
📎	357	Count Numbers with Unique Digits	Medium
🔒	358	Rearrange String k Distance Apart	Hard
🔒	359	Logger Rate Limiter	Easy
🔒	360	Sort Transformed Array	Medium
🔒	361	Bomb Enemy	Medium
🔒	362	Design Hit Counter	Medium
📎	363	Max Sum of Rectangle No Larger Than K	Hard
🔒	364	Nested List Weight Sum II	Medium
📎	365	Water and Jug Problem	Medium
🔒	366	Find Leaves of Binary Tree	Medium
📎	367	Valid Perfect Square	Easy
📎	368	Largest Divisible Subset	Medium
🔒	369	Plus One Linked List	Medium
🔒	370	Range Addition	Medium
	371	Sum of Two Integers	Medium
📎	372	Super Pow	Medium
	373	Find K Pairs with Smallest Sums	Medium
📎	374	Guess Number Higher or Lower	Easy
📎	375	Guess Number Higher or Lower II	Medium
📎	376	Wiggle Subsequence	Medium
📎	377	Combination Sum IV	Medium
📎	378	Kth Smallest Element in a Sorted Matrix	Medium
🔒	379	Design Phone Directory	Medium
📎	380	Insert Delete GetRandom O(1)	Medium
	381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard
📎	382	Linked List Random Node	Medium
📎	383	Ransom Note	Easy
📎	384	Shuffle an Array	Medium
	385	Mini Parser	Medium
	386	Lexicographical Numbers	Medium
📎	387	First Unique Character in a String	Easy
📎	388	Longest Absolute File Path	Medium
📎	389	Find the Difference	Easy
	390	Elimination Game	Medium
	391	Perfect Rectangle	Hard
📎	392	Is Subsequence	Easy
📎	393	UTF-8 Validation	Medium
📎	394	Decode String	Medium
	395	Longest Substring with At Least K Repeating Characters	Medium
	396	Rotate Function	Medium
📎	397	Integer Replacement	Medium
	398	Random Pick Index	Medium
📎	399	Evaluate Division	Medium
	400	Nth Digit	Medium
📎	401	Binary Watch	Easy
📎	402	Remove K Digits	Medium
	403	Frog Jump	Hard
📎	404	Sum of Left Leaves	Easy
📎	405	Convert a Number to Hexadecimal	Easy
📎	406	Queue Reconstruction by Height	Medium
	407	Trapping Rain Water II	Hard
🔒	408	Valid Word Abbreviation	Easy
📎	409	Longest Palindrome	Easy
📎	410	Split Array Largest Sum	Hard
🔒	411	Minimum Unique Word Abbreviation	Hard
📎	412	Fizz Buzz	Easy
📎	413	Arithmetic Slices	Medium
📎	414	Third Maximum Number	Easy
📎	415	Add Strings	Easy
📎	416	Partition Equal Subset Sum	Medium
📎	417	Pacific Atlantic Water Flow	Medium
🔒	418	Sentence Screen Fitting	Medium
	419	Battleships in a Board	Medium
	420	Strong Password Checker	Hard
📎	421	Maximum XOR of Two Numbers in an Array	Medium
🔒	422	Valid Word Square	Easy
	423	Reconstruct Original Digits from English	Medium
📎	424	Longest Repeating Character Replacement	Medium
🔒	425	Word Squares	Hard
🔒	426	Convert Binary Search Tree to Sorted Doubly Linked List	Medium
	427	Construct Quad Tree	Medium
🔒	428	Serialize and Deserialize N-ary Tree	Hard
📎	429	N-ary Tree Level Order Traversal	Medium
📎	430	Flatten a Multilevel Doubly Linked List	Medium
🔒	431	Encode N-ary Tree to Binary Tree	Hard
	432	All O`one Data Structure	Hard
📎	433	Minimum Genetic Mutation	Medium
📎	434	Number of Segments in a String	Easy
📎	435	Non-overlapping Intervals	Medium
📎	436	Find Right Interval	Medium
📎	437	Path Sum III	Medium
📎	438	Find All Anagrams in a String	Medium
🔒	439	Ternary Expression Parser	Medium
	440	K-th Smallest in Lexicographical Order	Hard
📎	441	Arranging Coins	Easy
📎	442	Find All Duplicates in an Array	Medium
	443	String Compression	Medium
🔒	444	Sequence Reconstruction	Medium
📎	445	Add Two Numbers II	Medium
📎	446	Arithmetic Slices II - Subsequence	Hard
	447	Number of Boomerangs	Medium
📎	448	Find All Numbers Disappeared in an Array	Easy
	449	Serialize and Deserialize BST	Medium
📎	450	Delete Node in a BST	Medium
📎	451	Sort Characters By Frequency	Medium
📎	452	Minimum Number of Arrows to Burst Balloons	Medium
	453	Minimum Moves to Equal Array Elements	Medium
📎	454	4Sum II	Medium
📎	455	Assign Cookies	Easy
📎	456	132 Pattern	Medium
	457	Circular Array Loop	Medium
📎	458	Poor Pigs	Hard
📎	459	Repeated Substring Pattern	Easy
📎	460	LFU Cache	Hard
📎	461	Hamming Distance	Easy
📎	462	Minimum Moves to Equal Array Elements II	Medium
📎	463	Island Perimeter	Easy
	464	Can I Win	Medium
🔒	465	Optimal Account Balancing	Hard
	466	Count The Repetitions	Hard
	467	Unique Substrings in Wraparound String	Medium
📎	468	Validate IP Address	Medium
🔒	469	Convex Polygon	Medium
	470	Implement Rand10() Using Rand7()	Medium
🔒	471	Encode String with Shortest Length	Hard
📎	472	Concatenated Words	Hard
📎	473	Matchsticks to Square	Medium
📎	474	Ones and Zeroes	Medium
	475	Heaters	Medium
📎	476	Number Complement	Easy
	477	Total Hamming Distance	Medium
	478	Generate Random Point in a Circle	Medium
	479	Largest Palindrome Product	Hard
	480	Sliding Window Median	Hard
	481	Magical String	Medium
📎	482	License Key Formatting	Easy
	483	Smallest Good Base	Hard
🔒	484	Find Permutation	Medium
📎	485	Max Consecutive Ones	Easy
	486	Predict the Winner	Medium
🔒	487	Max Consecutive Ones II	Medium
	488	Zuma Game	Hard
🔒	489	Robot Room Cleaner	Hard
🔒	490	The Maze	Medium
📎	491	Non-decreasing Subsequences	Medium
📎	492	Construct the Rectangle	Easy
	493	Reverse Pairs	Hard
	494	Target Sum	Medium
📎	495	Teemo Attacking	Easy
📎	496	Next Greater Element I	Easy
	497	Random Point in Non-overlapping Rectangles	Medium
	498	Diagonal Traverse	Medium
🔒	499	The Maze III	Hard
📎	500	Keyboard Row	Easy

### 501 ~ 750

</>	#	Solution Title	Difficulty
📎	501	Find Mode in Binary Search Tree	Easy
	502	IPO	Hard
📎	503	Next Greater Element II	Medium
📎	504	Base 7	Easy
🔒	505	The Maze II	Medium
	506	Relative Ranks	Easy
📎	507	Perfect Number	Easy
	508	Most Frequent Subtree Sum	Medium
📎	509	Fibonacci Number	Easy
🔒	510	Inorder Successor in BST II	Medium
	511	Game Play Analysis I	Easy
🔒	512	Game Play Analysis II	Easy
📎	513	Find Bottom Left Tree Value	Medium
	514	Freedom Trail	Hard
📎	515	Find Largest Value in Each Tree Row	Medium
📎	516	Longest Palindromic Subsequence	Medium
	517	Super Washing Machines	Hard
📎	518	Coin Change II	Medium
	519	Random Flip Matrix	Medium
📎	520	Detect Capital	Easy
	521	Longest Uncommon Subsequence I	Easy
	522	Longest Uncommon Subsequence II	Medium
📎	523	Continuous Subarray Sum	Medium
	524	Longest Word in Dictionary through Deleting	Medium
📎	525	Contiguous Array	Medium
	526	Beautiful Arrangement	Medium
🔒	527	Word Abbreviation	Hard
📎	528	Random Pick with Weight	Medium
	529	Minesweeper	Medium
📎	530	Minimum Absolute Difference in BST	Easy
🔒	531	Lonely Pixel I	Medium
📎	532	K-diff Pairs in an Array	Medium
🔒	533	Lonely Pixel II	Medium
🔒	534	Game Play Analysis III	Medium
📎	535	Encode and Decode TinyURL	Medium
🔒	536	Construct Binary Tree from String	Medium
	537	Complex Number Multiplication	Medium
📎	538	Convert BST to Greater Tree	Medium
📎	539	Minimum Time Difference	Medium
📎	540	Single Element in a Sorted Array	Medium
📎	541	Reverse String II	Easy
📎	542	01 Matrix	Medium
📎	543	Diameter of Binary Tree	Easy
🔒	544	Output Contest Matches	Medium
🔒	545	Boundary of Binary Tree	Medium
	546	Remove Boxes	Hard
📎	547	Number of Provinces	Medium
🔒	548	Split Array with Equal Sum	Hard
🔒	549	Binary Tree Longest Consecutive Sequence II	Medium
🔒	550	Game Play Analysis IV	Medium
	551	Student Attendance Record I	Easy
	552	Student Attendance Record II	Hard
	553	Optimal Division	Medium
	554	Brick Wall	Medium
🔒	555	Split Concatenated Strings	Medium
📎	556	Next Greater Element III	Medium
📎	557	Reverse Words in a String III	Easy
	558	Logical OR of Two Binary Grids Represented as Quad-Trees	Medium
📎	559	Maximum Depth of N-ary Tree	Easy
📎	560	Subarray Sum Equals K	Medium
📎	561	Array Partition	Easy
🔒	562	Longest Line of Consecutive One in Matrix	Medium
📎	563	Binary Tree Tilt	Easy
	564	Find the Closest Palindrome	Hard
	565	Array Nesting	Medium
📎	566	Reshape the Matrix	Easy
📎	567	Permutation in String	Medium
🔒	568	Maximum Vacation Days	Hard
🔒	569	Median Employee Salary	Hard
🔒	570	Managers with at Least 5 Direct Reports	Medium
🔒	571	Find Median Given Frequency of Numbers	Hard
📎	572	Subtree of Another Tree	Easy
🔒	573	Squirrel Simulation	Medium
🔒	574	Winning Candidate	Medium
	575	Distribute Candies	Easy
📎	576	Out of Boundary Paths	Medium
🔒	577	Employee Bonus	Easy
🔒	578	Get Highest Answer Rate Question	Medium
🔒	579	Find Cumulative Salary of an Employee	Hard
🔒	580	Count Student Number in Departments	Medium
📎	581	Shortest Unsorted Continuous Subarray	Medium
🔒	582	Kill Process	Medium
📎	583	Delete Operation for Two Strings	Medium
	584	Find Customer Referee	Easy
🔒	585	Investments in 2016	Medium
	586	Customer Placing the Largest Number of Orders	Easy
📎	587	Erect the Fence	Hard
🔒	588	Design In-Memory File System	Hard
📎	589	N-ary Tree Preorder Traversal	Easy
📎	590	N-ary Tree Postorder Traversal	Easy
	591	Tag Validator	Hard
	592	Fraction Addition and Subtraction	Medium
	593	Valid Square	Medium
	594	Longest Harmonious Subsequence	Easy
	595	Big Countries	Easy
	596	Classes More Than 5 Students	Easy
🔒	597	Friend Requests I: Overall Acceptance Rate	Easy
	598	Range Addition II	Easy
	599	Minimum Index Sum of Two Lists	Easy
	600	Non-negative Integers without Consecutive Ones	Hard
	601	Human Traffic of Stadium	Hard
🔒	602	Friend Requests II: Who Has the Most Friends	Medium
🔒	603	Consecutive Available Seats	Easy
🔒	604	Design Compressed String Iterator	Easy
📎	605	Can Place Flowers	Easy
📎	606	Construct String from Binary Tree	Easy
	607	Sales Person	Easy
	608	Tree Node	Medium
📎	609	Find Duplicate File in System	Medium
🔒	610	Triangle Judgement	Easy
📎	611	Valid Triangle Number	Medium
🔒	612	Shortest Distance in a Plane	Medium
🔒	613	Shortest Distance in a Line	Easy
🔒	614	Second Degree Follower	Medium
🔒	615	Average Salary: Departments VS Company	Hard
🔒	616	Add Bold Tag in String	Medium
📎	617	Merge Two Binary Trees	Easy
🔒	618	Students Report By Geography	Hard
🔒	619	Biggest Single Number	Easy
	620	Not Boring Movies	Easy
📎	621	Task Scheduler	Medium
📎	622	Design Circular Queue	Medium
📎	623	Add One Row to Tree	Medium
🔒	624	Maximum Distance in Arrays	Medium
🔒	625	Minimum Factorization	Medium
	626	Exchange Seats	Medium
	627	Swap Salary	Easy
	628	Maximum Product of Three Numbers	Easy
📎	629	K Inverse Pairs Array	Hard
📎	630	Course Schedule III	Hard
🔒	631	Design Excel Sum Formula	Hard
	632	Smallest Range Covering Elements from K Lists	Hard
📎	633	Sum of Square Numbers	Medium
🔒	634	Find the Derangement of An Array	Medium
🔒	635	Design Log Storage System	Medium
	636	Exclusive Time of Functions	Medium
📎	637	Average of Levels in Binary Tree	Easy
	638	Shopping Offers	Medium
	639	Decode Ways II	Hard
📎	640	Solve the Equation	Medium
	641	Design Circular Deque	Medium
🔒	642	Design Search Autocomplete System	Hard
📎	643	Maximum Average Subarray I	Easy
🔒	644	Maximum Average Subarray II	Hard
📎	645	Set Mismatch	Easy
	646	Maximum Length of Pair Chain	Medium
📎	647	Palindromic Substrings	Medium
	648	Replace Words	Medium
	649	Dota2 Senate	Medium
	650	2 Keys Keyboard	Medium
🔒	651	4 Keys Keyboard	Medium
	652	Find Duplicate Subtrees	Medium
📎	653	Two Sum IV - Input is a BST	Easy
📎	654	Maximum Binary Tree	Medium
📎	655	Print Binary Tree	Medium
🔒	656	Coin Path	Hard
📎	657	Robot Return to Origin	Easy
📎	658	Find K Closest Elements	Medium
📎	659	Split Array into Consecutive Subsequences	Medium
🔒	660	Remove 9	Hard
📎	661	Image Smoother	Easy
📎	662	Maximum Width of Binary Tree	Medium
🔒	663	Equal Tree Partition	Medium
	664	Strange Printer	Hard
📎	665	Non-decreasing Array	Medium
🔒	666	Path Sum IV	Medium
	667	Beautiful Arrangement II	Medium
📎	668	Kth Smallest Number in Multiplication Table	Hard
📎	669	Trim a Binary Search Tree	Medium
	670	Maximum Swap	Medium
📎	671	Second Minimum Node In a Binary Tree	Easy
	672	Bulb Switcher II	Medium
📎	673	Number of Longest Increasing Subsequence	Medium
	674	Longest Continuous Increasing Subsequence	Easy
	675	Cut Off Trees for Golf Event	Hard
	676	Implement Magic Dictionary	Medium
	677	Map Sum Pairs	Medium
	678	Valid Parenthesis String	Medium
	679	24 Game	Hard
📎	680	Valid Palindrome II	Easy
🔒	681	Next Closest Time	Medium
📎	682	Baseball Game	Easy
🔒	683	K Empty Slots	Hard
📎	684	Redundant Connection	Medium
	685	Redundant Connection II	Hard
	686	Repeated String Match	Medium
📎	687	Longest Univalue Path	Medium
	688	Knight Probability in Chessboard	Medium
	689	Maximum Sum of 3 Non-Overlapping Subarrays	Hard
	690	Employee Importance	Medium
	691	Stickers to Spell Word	Hard
📎	692	Top K Frequent Words	Medium
📎	693	Binary Number with Alternating Bits	Easy
🔒	694	Number of Distinct Islands	Medium
📎	695	Max Area of Island	Medium
📎	696	Count Binary Substrings	Easy
📎	697	Degree of an Array	Easy
📎	698	Partition to K Equal Sum Subsets	Medium
	699	Falling Squares	Hard
📎	700	Search in a Binary Search Tree	Easy
📎	701	Insert into a Binary Search Tree	Medium
🔒	702	Search in a Sorted Array of Unknown Size	Medium
📎	703	Kth Largest Element in a Stream	Easy
📎	704	Binary Search	Easy
📎	705	Design HashSet	Easy
📎	706	Design HashMap	Easy
📎	707	Design Linked List	Medium
🔒	708	Insert into a Sorted Circular Linked List	Medium
📎	709	To Lower Case	Easy
	710	Random Pick with Blacklist	Hard
🔒	711	Number of Distinct Islands II	Hard
	712	Minimum ASCII Delete Sum for Two Strings	Medium
📎	713	Subarray Product Less Than K	Medium
📎	714	Best Time to Buy and Sell Stock with Transaction Fee	Medium
	715	Range Module	Hard
🔒	716	Max Stack	Hard
📎	717	1-bit and 2-bit Characters	Easy
📎	718	Maximum Length of Repeated Subarray	Medium
	719	Find K-th Smallest Pair Distance	Hard
	720	Longest Word in Dictionary	Medium
📎	721	Accounts Merge	Medium
📎	722	Remove Comments	Medium
🔒	723	Candy Crush	Medium
📎	724	Find Pivot Index	Easy
📎	725	Split Linked List in Parts	Medium
	726	Number of Atoms	Hard
🔒	727	Minimum Window Subsequence	Hard
📎	728	Self Dividing Numbers	Easy
📎	729	My Calendar I	Medium
	730	Count Different Palindromic Subsequences	Hard
	731	My Calendar II	Medium
📎	732	My Calendar III	Hard
📎	733	Flood Fill	Easy
🔒	734	Sentence Similarity	Easy
📎	735	Asteroid Collision	Medium
	736	Parse Lisp Expression	Hard
🔒	737	Sentence Similarity II	Medium
	738	Monotone Increasing Digits	Medium
📎	739	Daily Temperatures	Medium
📎	740	Delete and Earn	Medium
	741	Cherry Pickup	Hard
🔒	742	Closest Leaf in a Binary Tree	Medium
📎	743	Network Delay Time	Medium
📎	744	Find Smallest Letter Greater Than Target	Easy
📎	745	Prefix and Suffix Search	Hard
📎	746	Min Cost Climbing Stairs	Easy
📎	747	Largest Number At Least Twice of Others	Easy
📎	748	Shortest Completing Word	Easy
	749	Contain Virus	Hard
🔒	750	Number Of Corner Rectangles	Medium

### 751 ~ 1000

</>	#	Solution Title	Difficulty
🔒	751	IP to CIDR	Medium
📎	752	Open the Lock	Medium
	753	Cracking the Safe	Hard
	754	Reach a Number	Medium
🔒	755	Pour Water	Medium
	756	Pyramid Transition Matrix	Medium
	757	Set Intersection Size At Least Two	Hard
🔒	758	Bold Words in String	Medium
🔒	759	Employee Free Time	Hard
🔒	760	Find Anagram Mappings	Easy
	761	Special Binary String	Hard
📎	762	Prime Number of Set Bits in Binary Representation	Easy
📎	763	Partition Labels	Medium
📎	764	Largest Plus Sign	Medium
	765	Couples Holding Hands	Hard
📎	766	Toeplitz Matrix	Easy
📎	767	Reorganize String	Medium
	768	Max Chunks To Make Sorted II	Hard
📎	769	Max Chunks To Make Sorted	Medium
	770	Basic Calculator IV	Hard
📎	771	Jewels and Stones	Easy
🔒	772	Basic Calculator III	Hard
	773	Sliding Puzzle	Hard
🔒	774	Minimize Max Distance to Gas Station	Hard
	775	Global and Local Inversions	Medium
🔒	776	Split BST	Medium
	777	Swap Adjacent in LR String	Medium
	778	Swim in Rising Water	Hard
📎	779	K-th Symbol in Grammar	Medium
	780	Reaching Points	Hard
	781	Rabbits in Forest	Medium
📎	782	Transform to Chessboard	Hard
📎	783	Minimum Distance Between BST Nodes	Easy
📎	784	Letter Case Permutation	Medium
📎	785	Is Graph Bipartite?	Medium
	786	K-th Smallest Prime Fraction	Medium
📎	787	Cheapest Flights Within K Stops	Medium
	788	Rotated Digits	Medium
	789	Escape The Ghosts	Medium
📎	790	Domino and Tromino Tiling	Medium
	791	Custom Sort String	Medium
📎	792	Number of Matching Subsequences	Medium
	793	Preimage Size of Factorial Zeroes Function	Hard
📎	794	Valid Tic-Tac-Toe State	Medium
	795	Number of Subarrays with Bounded Maximum	Medium
📎	796	Rotate String	Easy
📎	797	All Paths From Source to Target	Medium
	798	Smallest Rotation with Highest Score	Hard
📎	799	Champagne Tower	Medium
🔒	800	Similar RGB Color	Easy
	801	Minimum Swaps To Make Sequences Increasing	Hard
📎	802	Find Eventual Safe States	Medium
	803	Bricks Falling When Hit	Hard
📎	804	Unique Morse Code Words	Easy
	805	Split Array With Same Average	Hard
	806	Number of Lines To Write String	Easy
	807	Max Increase to Keep City Skyline	Medium
	808	Soup Servings	Medium
	809	Expressive Words	Medium
	810	Chalkboard XOR Game	Hard
	811	Subdomain Visit Count	Medium
📎	812	Largest Triangle Area	Easy
	813	Largest Sum of Averages	Medium
📎	814	Binary Tree Pruning	Medium
📎	815	Bus Routes	Hard
	816	Ambiguous Coordinates	Medium
	817	Linked List Components	Medium
	818	Race Car	Hard
📎	819	Most Common Word	Easy
📎	820	Short Encoding of Words	Medium
📎	821	Shortest Distance to a Character	Easy
	822	Card Flipping Game	Medium
📎	823	Binary Trees With Factors	Medium
📎	824	Goat Latin	Easy
	825	Friends Of Appropriate Ages	Medium
📎	826	Most Profit Assigning Work	Medium
	827	Making A Large Island	Hard
	828	Count Unique Characters of All Substrings of a Given String	Hard
	829	Consecutive Numbers Sum	Hard
📎	830	Positions of Large Groups	Easy
	831	Masking Personal Information	Medium
	832	Flipping an Image	Easy
	833	Find And Replace in String	Medium
	834	Sum of Distances in Tree	Hard
📎	835	Image Overlap	Medium
	836	Rectangle Overlap	Easy
	837	New 21 Game	Medium
📎	838	Push Dominoes	Medium
	839	Similar String Groups	Hard
📎	840	Magic Squares In Grid	Medium
📎	841	Keys and Rooms	Medium
	842	Split Array into Fibonacci Sequence	Medium
	843	Guess the Word	Hard
📎	844	Backspace String Compare	Easy
	845	Longest Mountain in Array	Medium
	846	Hand of Straights	Medium
📎	847	Shortest Path Visiting All Nodes	Hard
📎	848	Shifting Letters	Medium
📎	849	Maximize Distance to Closest Person	Medium
	850	Rectangle Area II	Hard
	851	Loud and Rich	Medium
📎	852	Peak Index in a Mountain Array	Medium
	853	Car Fleet	Medium
	854	K-Similar Strings	Hard
	855	Exam Room	Medium
📎	856	Score of Parentheses	Medium
	857	Minimum Cost to Hire K Workers	Hard
📎	858	Mirror Reflection	Medium
📎	859	Buddy Strings	Easy
📎	860	Lemonade Change	Easy
	861	Score After Flipping Matrix	Medium
📎	862	Shortest Subarray with Sum at Least K	Hard
	863	All Nodes Distance K in Binary Tree	Medium
	864	Shortest Path to Get All Keys	Hard
	865	Smallest Subtree with all the Deepest Nodes	Medium
	866	Prime Palindrome	Medium
📎	867	Transpose Matrix	Easy
📎	868	Binary Gap	Easy
📎	869	Reordered Power of 2	Medium
	870	Advantage Shuffle	Medium
📎	871	Minimum Number of Refueling Stops	Hard
📎	872	Leaf-Similar Trees	Easy
	873	Length of Longest Fibonacci Subsequence	Medium
	874	Walking Robot Simulation	Medium
📎	875	Koko Eating Bananas	Medium
📎	876	Middle of the Linked List	Easy
	877	Stone Game	Medium
📎	878	Nth Magical Number	Hard
	879	Profitable Schemes	Hard
	880	Decoded String at Index	Medium
📎	881	Boats to Save People	Medium
📎	882	Reachable Nodes In Subdivided Graph	Hard
	883	Projection Area of 3D Shapes	Easy
📎	884	Uncommon Words from Two Sentences	Easy
	885	Spiral Matrix III	Medium
📎	886	Possible Bipartition	Medium
	887	Super Egg Drop	Hard
📎	888	Fair Candy Swap	Easy
	889	Construct Binary Tree from Preorder and Postorder Traversal	Medium
📎	890	Find and Replace Pattern	Medium
	891	Sum of Subsequence Widths	Hard
	892	Surface Area of 3D Shapes	Easy
	893	Groups of Special-Equivalent Strings	Medium
	894	All Possible Full Binary Trees	Medium
📎	895	Maximum Frequency Stack	Hard
📎	896	Monotonic Array	Easy
📎	897	Increasing Order Search Tree	Easy
📎	898	Bitwise ORs of Subarrays	Medium
📎	899	Orderly Queue	Hard
	900	RLE Iterator	Medium
📎	901	Online Stock Span	Medium
📎	902	Numbers At Most N Given Digit Set	Hard
	903	Valid Permutations for DI Sequence	Hard
	904	Fruit Into Baskets	Medium
📎	905	Sort Array By Parity	Easy
	906	Super Palindromes	Hard
📎	907	Sum of Subarray Minimums	Medium
📎	908	Smallest Range I	Easy
📎	909	Snakes and Ladders	Medium
📎	910	Smallest Range II	Medium
📎	911	Online Election	Medium
📎	912	Sort an Array	Medium
	913	Cat and Mouse	Hard
📎	914	X of a Kind in a Deck of Cards	Easy
	915	Partition Array into Disjoint Intervals	Medium
📎	916	Word Subsets	Medium
📎	917	Reverse Only Letters	Easy
📎	918	Maximum Sum Circular Subarray	Medium
	919	Complete Binary Tree Inserter	Medium
	920	Number of Music Playlists	Hard
	921	Minimum Add to Make Parentheses Valid	Medium
📎	922	Sort Array By Parity II	Easy
📎	923	3Sum With Multiplicity	Medium
	924	Minimize Malware Spread	Hard
📎	925	Long Pressed Name	Easy
	926	Flip String to Monotone Increasing	Medium
	927	Three Equal Parts	Hard
	928	Minimize Malware Spread II	Hard
📎	929	Unique Email Addresses	Easy
	930	Binary Subarrays With Sum	Medium
📎	931	Minimum Falling Path Sum	Medium
	932	Beautiful Array	Medium
📎	933	Number of Recent Calls	Easy
📎	934	Shortest Bridge	Medium
	935	Knight Dialer	Medium
📎	936	Stamping The Sequence	Hard
	937	Reorder Data in Log Files	Medium
📎	938	Range Sum of BST	Easy
	939	Minimum Area Rectangle	Medium
	940	Distinct Subsequences II	Hard
📎	941	Valid Mountain Array	Easy
	942	DI String Match	Easy
	943	Find the Shortest Superstring	Hard
📎	944	Delete Columns to Make Sorted	Easy
	945	Minimum Increment to Make Array Unique	Medium
📎	946	Validate Stack Sequences	Medium
📎	947	Most Stones Removed with Same Row or Column	Medium
📎	948	Bag of Tokens	Medium
	949	Largest Time for Given Digits	Medium
	950	Reveal Cards In Increasing Order	Medium
📎	951	Flip Equivalent Binary Trees	Medium
📎	952	Largest Component Size by Common Factor	Hard
📎	953	Verifying an Alien Dictionary	Easy
	954	Array of Doubled Pairs	Medium
	955	Delete Columns to Make Sorted II	Medium
	956	Tallest Billboard	Hard
	957	Prison Cells After N Days	Medium
📎	958	Check Completeness of a Binary Tree	Medium
	959	Regions Cut By Slashes	Medium
	960	Delete Columns to Make Sorted III	Hard
	961	N-Repeated Element in Size 2N Array	Easy
	962	Maximum Width Ramp	Medium
	963	Minimum Area Rectangle II	Medium
	964	Least Operators to Express Number	Hard
📎	965	Univalued Binary Tree	Easy
	966	Vowel Spellchecker	Medium
📎	967	Numbers With Same Consecutive Differences	Medium
📎	968	Binary Tree Cameras	Hard
	969	Pancake Sorting	Medium
	970	Powerful Integers	Medium
	971	Flip Binary Tree To Match Preorder Traversal	Medium
	972	Equal Rational Numbers	Hard
📎	973	K Closest Points to Origin	Medium
📎	974	Subarray Sums Divisible by K	Medium
	975	Odd Even Jump	Hard
📎	976	Largest Perimeter Triangle	Easy
📎	977	Squares of a Sorted Array	Easy
📎	978	Longest Turbulent Subarray	Medium
	979	Distribute Coins in Binary Tree	Medium
📎	980	Unique Paths III	Hard
📎	981	Time Based Key-Value Store	Medium
	982	Triples with Bitwise AND Equal To Zero	Hard
📎	983	Minimum Cost For Tickets	Medium
	984	String Without AAA or BBB	Medium
📎	985	Sum of Even Numbers After Queries	Medium
📎	986	Interval List Intersections	Medium
📎	987	Vertical Order Traversal of a Binary Tree	Hard
	988	Smallest String Starting From Leaf	Medium
📎	989	Add to Array-Form of Integer	Easy
📎	990	Satisfiability of Equality Equations	Medium
📎	991	Broken Calculator	Medium
	992	Subarrays with K Different Integers	Hard
📎	993	Cousins in Binary Tree	Easy
📎	994	Rotting Oranges	Medium
	995	Minimum Number of K Consecutive Bit Flips	Hard
	996	Number of Squareful Arrays	Hard
📎	997	Find the Town Judge	Easy
	998	Maximum Binary Tree II	Medium
📎	999	Available Captures for Rook	Easy
	1000	Minimum Cost to Merge Stones	Hard

### 1001 ~ 1250

</>	#	Solution Title	Difficulty
	1001	Grid Illumination	Hard
📎	1002	Find Common Characters	Easy
	1003	Check If Word Is Valid After Substitutions	Medium
	1004	Max Consecutive Ones III	Medium
	1005	Maximize Sum Of Array After K Negations	Easy
	1006	Clumsy Factorial	Medium
📎	1007	Minimum Domino Rotations For Equal Row	Medium
📎	1008	Construct Binary Search Tree from Preorder Traversal	Medium
📎	1009	Complement of Base 10 Integer	Easy
📎	1010	Pairs of Songs With Total Durations Divisible by 60	Medium
	1011	Capacity To Ship Packages Within D Days	Medium
	1012	Numbers With Repeated Digits	Hard
	1013	Partition Array Into Three Parts With Equal Sum	Easy
📎	1014	Best Sightseeing Pair	Medium
📎	1015	Smallest Integer Divisible by K	Medium
	1016	Binary String With Substrings Representing 1 To N	Medium
📎	1017	Convert to Base -2	Medium
📎	1018	Binary Prefix Divisible By 5	Easy
📎	1019	Next Greater Node In Linked List	Medium
📎	1020	Number of Enclaves	Medium
	1021	Remove Outermost Parentheses	Easy
📎	1022	Sum of Root To Leaf Binary Numbers	Easy
	1023	Camelcase Matching	Medium
	1024	Video Stitching	Medium
	1025	Divisor Game	Easy
📎	1026	Maximum Difference Between Node and Ancestor	Medium
	1027	Longest Arithmetic Subsequence	Medium
	1028	Recover a Tree From Preorder Traversal	Hard
📎	1029	Two City Scheduling	Medium
	1030	Matrix Cells in Distance Order	Easy
📎	1031	Maximum Sum of Two Non-Overlapping Subarrays	Medium
📎	1032	Stream of Characters	Hard
	1033	Moving Stones Until Consecutive	Medium
	1034	Coloring A Border	Medium
📎	1035	Uncrossed Lines	Medium
	1036	Escape a Large Maze	Hard
📎	1037	Valid Boomerang	Easy
	1038	Binary Search Tree to Greater Sum Tree	Medium
📎	1039	Minimum Score Triangulation of Polygon	Medium
	1040	Moving Stones Until Consecutive II	Medium
📎	1041	Robot Bounded In Circle	Medium
	1042	Flower Planting With No Adjacent	Medium
📎	1043	Partition Array for Maximum Sum	Medium
📎	1044	Longest Duplicate Substring	Hard
🔒	1045	Customers Who Bought All Products	Medium
📎	1046	Last Stone Weight	Easy
📎	1047	Remove All Adjacent Duplicates In String	Easy
📎	1048	Longest String Chain	Medium
📎	1049	Last Stone Weight II	Medium
	1050	Actors and Directors Who Cooperated At Least Three Times	Easy
📎	1051	Height Checker	Easy
	1052	Grumpy Bookstore Owner	Medium
📎	1053	Previous Permutation With One Swap	Medium
	1054	Distant Barcodes	Medium
🔒	1055	Shortest Way to Form String	Medium
🔒	1056	Confusing Number	Easy
🔒	1057	Campus Bikes	Medium
🔒	1058	Minimize Rounding Error to Meet Target	Medium
🔒	1059	All Paths from Source Lead to Destination	Medium
🔒	1060	Missing Element in Sorted Array	Medium
📎	1061	Lexicographically Smallest Equivalent String	Medium
🔒	1062	Longest Repeating Substring	Medium
🔒	1063	Number of Valid Subarrays	Hard
🔒	1064	Fixed Point	Easy
🔒	1065	Index Pairs of a String	Easy
🔒	1066	Campus Bikes II	Medium
🔒	1067	Digit Count in Range	Hard
🔒	1068	Product Sales Analysis I	Easy
🔒	1069	Product Sales Analysis II	Easy
🔒	1070	Product Sales Analysis III	Medium
📎	1071	Greatest Common Divisor of Strings	Easy
	1072	Flip Columns For Maximum Number of Equal Rows	Medium
	1073	Adding Two Negabinary Numbers	Medium
📎	1074	Number of Submatrices That Sum to Target	Hard
🔒	1075	Project Employees I	Easy
🔒	1076	Project Employees II	Easy
🔒	1077	Project Employees III	Medium
📎	1078	Occurrences After Bigram	Easy
	1079	Letter Tile Possibilities	Medium
	1080	Insufficient Nodes in Root to Leaf Paths	Medium
📎	1081	Smallest Subsequence of Distinct Characters	Medium
🔒	1082	Sales Analysis I	Easy
🔒	1083	Sales Analysis II	Easy
	1084	Sales Analysis III	Easy
🔒	1085	Sum of Digits in the Minimum Number	Easy
🔒	1086	High Five	Easy
🔒	1087	Brace Expansion	Medium
🔒	1088	Confusing Number II	Hard
📎	1089	Duplicate Zeros	Easy
	1090	Largest Values From Labels	Medium
📎	1091	Shortest Path in Binary Matrix	Medium
	1092	Shortest Common Supersequence	Hard
📎	1093	Statistics from a Large Sample	Medium
📎	1094	Car Pooling	Medium
	1095	Find in Mountain Array	Hard
	1096	Brace Expansion II	Hard
🔒	1097	Game Play Analysis V	Hard
🔒	1098	Unpopular Books	Medium
🔒	1099	Two Sum Less Than K	Easy
🔒	1100	Find K-Length Substrings With No Repeated Characters	Medium
🔒	1101	The Earliest Moment When Everyone Become Friends	Medium
🔒	1102	Path With Maximum Minimum Value	Medium
	1103	Distribute Candies to People	Easy
	1104	Path In Zigzag Labelled Binary Tree	Medium
	1105	Filling Bookcase Shelves	Medium
	1106	Parsing A Boolean Expression	Hard
🔒	1107	New Users Daily Count	Medium
	1108	Defanging an IP Address	Easy
	1109	Corporate Flight Bookings	Medium
	1110	Delete Nodes And Return Forest	Medium
	1111	Maximum Nesting Depth of Two Valid Parentheses Strings	Medium
🔒	1112	Highest Grade For Each Student	Medium
🔒	1113	Reported Posts	Easy
	1114	Print in Order	Easy
	1115	Print FooBar Alternately	Medium
	1116	Print Zero Even Odd	Medium
	1117	Building H2O	Medium
🔒	1118	Number of Days in a Month	Easy
🔒	1119	Remove Vowels from a String	Easy
🔒	1120	Maximum Average Subtree	Medium
🔒	1121	Divide Array Into Increasing Sequences	Hard
📎	1122	Relative Sort Array	Easy
	1123	Lowest Common Ancestor of Deepest Leaves	Medium
📎	1124	Longest Well-Performing Interval	Medium
	1125	Smallest Sufficient Team	Hard
🔒	1126	Active Businesses	Medium
🔒	1127	User Purchase Platform	Hard
📎	1128	Number of Equivalent Domino Pairs	Easy
📎	1129	Shortest Path with Alternating Colors	Medium
	1130	Minimum Cost Tree From Leaf Values	Medium
	1131	Maximum of Absolute Value Expression	Medium
🔒	1132	Reported Posts II	Medium
🔒	1133	Largest Unique Number	Easy
🔒	1134	Armstrong Number	Easy
🔒	1135	Connecting Cities With Minimum Cost	Medium
🔒	1136	Parallel Courses	Medium
📎	1137	N-th Tribonacci Number	Easy
	1138	Alphabet Board Path	Medium
	1139	Largest 1-Bordered Square	Medium
	1140	Stone Game II	Medium
	1141	User Activity for the Past 30 Days I	Easy
🔒	1142	User Activity for the Past 30 Days II	Easy
📎	1143	Longest Common Subsequence	Medium
	1144	Decrease Elements To Make Array Zigzag	Medium
📎	1145	Binary Tree Coloring Game	Medium
📎	1146	Snapshot Array	Medium
	1147	Longest Chunked Palindrome Decomposition	Hard
	1148	Article Views I	Easy
🔒	1149	Article Views II	Medium
🔒	1150	Check If a Number Is Majority Element in a Sorted Array	Easy
🔒	1151	Minimum Swaps to Group All 1's Together	Medium
🔒	1152	Analyze User Website Visit Pattern	Medium
🔒	1153	String Transforms Into Another String	Hard
📎	1154	Day of the Year	Easy
📎	1155	Number of Dice Rolls With Target Sum	Medium
	1156	Swap For Longest Repeated Character Substring	Medium
	1157	Online Majority Element In Subarray	Hard
	1158	Market Analysis I	Medium
🔒	1159	Market Analysis II	Hard
📎	1160	Find Words That Can Be Formed by Characters	Easy
	1161	Maximum Level Sum of a Binary Tree	Medium
📎	1162	As Far from Land as Possible	Medium
	1163	Last Substring in Lexicographical Order	Hard
🔒	1164	Product Price at a Given Date	Medium
🔒	1165	Single-Row Keyboard	Easy
🔒	1166	Design File System	Medium
🔒	1167	Minimum Cost to Connect Sticks	Medium
🔒	1168	Optimize Water Distribution in a Village	Hard
	1169	Invalid Transactions	Medium
	1170	Compare Strings by Frequency of the Smallest Character	Medium
	1171	Remove Zero Sum Consecutive Nodes from Linked List	Medium
	1172	Dinner Plate Stacks	Hard
🔒	1173	Immediate Food Delivery I	Easy
🔒	1174	Immediate Food Delivery II	Medium
	1175	Prime Arrangements	Easy
🔒	1176	Diet Plan Performance	Easy
	1177	Can Make Palindrome from Substring	Medium
📎	1178	Number of Valid Words for Each Puzzle	Hard
	1179	Reformat Department Table	Easy
🔒	1180	Count Substrings with Only One Distinct Letter	Easy
🔒	1181	Before and After Puzzle	Medium
🔒	1182	Shortest Distance to Target Color	Medium
🔒	1183	Maximum Number of Ones	Hard
	1184	Distance Between Bus Stops	Easy
	1185	Day of the Week	Easy
	1186	Maximum Subarray Sum with One Deletion	Medium
	1187	Make Array Strictly Increasing	Hard
🔒	1188	Design Bounded Blocking Queue	Medium
📎	1189	Maximum Number of Balloons	Easy
	1190	Reverse Substrings Between Each Pair of Parentheses	Medium
📎	1191	K-Concatenation Maximum Sum	Medium
📎	1192	Critical Connections in a Network	Hard
🔒	1193	Monthly Transactions I	Medium
🔒	1194	Tournament Winners	Hard
	1195	Fizz Buzz Multithreaded	Medium
🔒	1196	How Many Apples Can You Put into the Basket	Easy
🔒	1197	Minimum Knight Moves	Medium
🔒	1198	Find Smallest Common Element in All Rows	Medium
🔒	1199	Minimum Time to Build Blocks	Hard
📎	1200	Minimum Absolute Difference	Easy
📎	1201	Ugly Number III	Medium
📎	1202	Smallest String With Swaps	Medium
	1203	Sort Items by Groups Respecting Dependencies	Hard
🔒	1204	Last Person to Fit in the Bus	Medium
🔒	1205	Monthly Transactions II	Medium
	1206	Design Skiplist	Hard
📎	1207	Unique Number of Occurrences	Easy
	1208	Get Equal Substrings Within Budget	Medium
📎	1209	Remove All Adjacent Duplicates in String II	Medium
	1210	Minimum Moves to Reach Target with Rotations	Hard
🔒	1211	Queries Quality and Percentage	Easy
🔒	1212	Team Scores in Football Tournament	Medium
🔒	1213	Intersection of Three Sorted Arrays	Easy
🔒	1214	Two Sum BSTs	Medium
🔒	1215	Stepping Numbers	Medium
🔒	1216	Valid Palindrome III	Hard
📎	1217	Minimum Cost to Move Chips to The Same Position	Easy
	1218	Longest Arithmetic Subsequence of Given Difference	Medium
	1219	Path with Maximum Gold	Medium
📎	1220	Count Vowels Permutation	Hard
📎	1221	Split a String in Balanced Strings	Easy
	1222	Queens That Can Attack the King	Medium
	1223	Dice Roll Simulation	Hard
	1224	Maximum Equal Frequency	Hard
🔒	1225	Report Contiguous Dates	Hard
	1226	The Dining Philosophers	Medium
	1227	Airplane Seat Assignment Probability	Medium
🔒	1228	Missing Number In Arithmetic Progression	Easy
🔒	1229	Meeting Scheduler	Medium
🔒	1230	Toss Strange Coins	Medium
🔒	1231	Divide Chocolate	Hard
📎	1232	Check If It Is a Straight Line	Easy
	1233	Remove Sub-Folders from the Filesystem	Medium
	1234	Replace the Substring for Balanced String	Medium
	1235	Maximum Profit in Job Scheduling	Hard
🔒	1236	Web Crawler	Medium
	1237	Find Positive Integer Solution for a Given Equation	Medium
	1238	Circular Permutation in Binary Representation	Medium
📎	1239	Maximum Length of a Concatenated String with Unique Characters	Medium
	1240	Tiling a Rectangle with the Fewest Squares	Hard
🔒	1241	Number of Comments per Post	Easy
🔒	1242	Web Crawler Multithreaded	Medium
🔒	1243	Array Transformation	Easy
🔒	1244	Design A Leaderboard	Medium
🔒	1245	Tree Diameter	Medium
🔒	1246	Palindrome Removal	Hard
	1247	Minimum Swaps to Make Strings Equal	Medium
	1248	Count Number of Nice Subarrays	Medium
📎	1249	Minimum Remove to Make Valid Parentheses	Medium
	1250	Check If It Is a Good Array	Hard

### 1251 ~ 1500

</>	#	Solution Title	Difficulty
🔒	1251	Average Selling Price	Easy
📎	1252	Cells with Odd Values in a Matrix	Easy
	1253	Reconstruct a 2-Row Binary Matrix	Medium
📎	1254	Number of Closed Islands	Medium
	1255	Maximum Score Words Formed by Letters	Hard
🔒	1256	Encode Number	Medium
🔒	1257	Smallest Common Region	Medium
🔒	1258	Synonymous Sentences	Medium
🔒	1259	Handshakes That Don't Cross	Hard
📎	1260	Shift 2D Grid	Easy
	1261	Find Elements in a Contaminated Binary Tree	Medium
	1262	Greatest Sum Divisible by Three	Medium
	1263	Minimum Moves to Move a Box to Their Target Location	Hard
🔒	1264	Page Recommendations	Medium
🔒	1265	Print Immutable Linked List in Reverse	Medium
📎	1266	Minimum Time Visiting All Points	Easy
📎	1267	Count Servers that Communicate	Medium
📎	1268	Search Suggestions System	Medium
	1269	Number of Ways to Stay in the Same Place After Some Steps	Hard
🔒	1270	All People Report to the Given Manager	Medium
🔒	1271	Hexspeak	Easy
🔒	1272	Remove Interval	Medium
🔒	1273	Delete Tree Nodes	Medium
🔒	1274	Number of Ships in a Rectangle	Hard
📎	1275	Find Winner on a Tic Tac Toe Game	Easy
	1276	Number of Burgers with No Waste of Ingredients	Medium
	1277	Count Square Submatrices with All Ones	Medium
	1278	Palindrome Partitioning III	Hard
🔒	1279	Traffic Light Controlled Intersection	Easy
🔒	1280	Students and Examinations	Easy
📎	1281	Subtract the Product and Sum of Digits of an Integer	Easy
	1282	Group the People Given the Group Size They Belong To	Medium
📎	1283	Find the Smallest Divisor Given a Threshold	Medium
	1284	Minimum Number of Flips to Convert Binary Matrix to Zero Matrix	Hard
🔒	1285	Find the Start and End Number of Continuous Ranges	Medium
📎	1286	Iterator for Combination	Medium
📎	1287	Element Appearing More Than 25% In Sorted Array	Easy
📎	1288	Remove Covered Intervals	Medium
	1289	Minimum Falling Path Sum II	Hard
📎	1290	Convert Binary Number in a Linked List to Integer	Easy
📎	1291	Sequential Digits	Medium
📎	1292	Maximum Side Length of a Square with Sum Less than or Equal to Threshold	Medium
📎	1293	Shortest Path in a Grid with Obstacles Elimination	Hard
🔒	1294	Weather Type in Each Country	Easy
📎	1295	Find Numbers with Even Number of Digits	Easy
	1296	Divide Array in Sets of K Consecutive Numbers	Medium
	1297	Maximum Number of Occurrences of a Substring	Medium
	1298	Maximum Candies You Can Get from Boxes	Hard
	1299	Replace Elements with Greatest Element on Right Side	Easy
📎	1300	Sum of Mutated Array Closest to Target	Medium
	1301	Number of Paths with Max Score	Hard
📎	1302	Deepest Leaves Sum	Medium
🔒	1303	Find the Team Size	Easy
	1304	Find N Unique Integers Sum up to Zero	Easy
📎	1305	All Elements in Two Binary Search Trees	Medium
📎	1306	Jump Game III	Medium
	1307	Verbal Arithmetic Puzzle	Hard
🔒	1308	Running Total for Different Genders	Medium
📎	1309	Decrypt String from Alphabet to Integer Mapping	Easy
	1310	XOR Queries of a Subarray	Medium
	1311	Get Watched Videos by Your Friends	Medium
	1312	Minimum Insertion Steps to Make a String Palindrome	Hard
	1313	Decompress Run-Length Encoded List	Easy
📎	1314	Matrix Block Sum	Medium
	1315	Sum of Nodes with Even-Valued Grandparent	Medium
	1316	Distinct Echo Substrings	Hard
	1317	Convert Integer to the Sum of Two No-Zero Integers	Easy
	1318	Minimum Flips to Make a OR b Equal to c	Medium
📎	1319	Number of Operations to Make Network Connected	Medium
	1320	Minimum Distance to Type a Word Using Two Fingers	Hard
🔒	1321	Restaurant Growth	Medium
🔒	1322	Ads Performance	Easy
📎	1323	Maximum 69 Number	Easy
	1324	Print Words Vertically	Medium
	1325	Delete Leaves With a Given Value	Medium
	1326	Minimum Number of Taps to Open to Water a Garden	Hard
🔒	1327	List the Products Ordered in a Period	Easy
📎	1328	Break a Palindrome	Medium
📎	1329	Sort the Matrix Diagonally	Medium
	1330	Reverse Subarray To Maximize Array Value	Hard
	1331	Rank Transform of an Array	Easy
📎	1332	Remove Palindromic Subsequences	Easy
	1333	Filter Restaurants by Vegan-Friendly, Price and Distance	Medium
	1334	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Medium
📎	1335	Minimum Difficulty of a Job Schedule	Hard
🔒	1336	Number of Transactions per Visit	Hard
📎	1337	The K Weakest Rows in a Matrix	Easy
📎	1338	Reduce Array Size to The Half	Medium
	1339	Maximum Product of Splitted Binary Tree	Medium
	1340	Jump Game V	Hard
🔒	1341	Movie Rating	Medium
📎	1342	Number of Steps to Reduce a Number to Zero	Easy
	1343	Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold	Medium
📎	1344	Angle Between Hands of a Clock	Medium
📎	1345	Jump Game IV	Hard
📎	1346	Check If N and Its Double Exist	Easy
	1347	Minimum Number of Steps to Make Two Strings Anagram	Medium
	1348	Tweet Counts Per Frequency	Medium
	1349	Maximum Students Taking Exam	Hard
🔒	1350	Students With Invalid Departments	Easy
📎	1351	Count Negative Numbers in a Sorted Matrix	Easy
	1352	Product of the Last K Numbers	Medium
	1353	Maximum Number of Events That Can Be Attended	Medium
	1354	Construct Target Array With Multiple Sums	Hard
🔒	1355	Activity Participants	Medium
📎	1356	Sort Integers by The Number of 1 Bits	Easy
	1357	Apply Discount Every n Orders	Medium
	1358	Number of Substrings Containing All Three Characters	Medium
📎	1359	Count All Valid Pickup and Delivery Options	Hard
	1360	Number of Days Between Two Dates	Easy
📎	1361	Validate Binary Tree Nodes	Medium
	1362	Closest Divisors	Medium
	1363	Largest Multiple of Three	Hard
📎	1364	Number of Trusted Contacts of a Customer	Medium
	1365	How Many Numbers Are Smaller Than the Current Number	Easy
	1366	Rank Teams by Votes	Medium
📎	1367	Linked List in Binary Tree	Medium
	1368	Minimum Cost to Make at Least One Valid Path in a Grid	Hard
🔒	1369	Get the Second Most Recent Activity	Hard
	1370	Increasing Decreasing String	Easy
	1371	Find the Longest Substring Containing Vowels in Even Counts	Medium
	1372	Longest ZigZag Path in a Binary Tree	Medium
	1373	Maximum Sum BST in Binary Tree	Hard
	1374	Generate a String With Characters That Have Odd Counts	Easy
	1375	Number of Times Binary String Is Prefix-Aligned	Medium
📎	1376	Time Needed to Inform All Employees	Medium
	1377	Frog Position After T Seconds	Hard
🔒	1378	Replace Employee ID With The Unique Identifier	Easy
📎	1379	Find a Corresponding Node of a Binary Tree in a Clone of That Tree	Easy
	1380	Lucky Numbers in a Matrix	Easy
	1381	Design a Stack With Increment Operation	Medium
📎	1382	Balance a Binary Search Tree	Medium
📎	1383	Maximum Performance of a Team	Hard
🔒	1384	Total Sales Amount by Year	Hard
📎	1385	Find the Distance Value Between Two Arrays	Easy
	1386	Cinema Seat Allocation	Medium
	1387	Sort Integers by The Power Value	Medium
	1388	Pizza With 3n Slices	Hard
	1389	Create Target Array in the Given Order	Easy
📎	1390	Four Divisors	Medium
	1391	Check if There is a Valid Path in a Grid	Medium
	1392	Longest Happy Prefix	Hard
	1393	Capital Gain/Loss	Medium
	1394	Find Lucky Integer in an Array	Easy
	1395	Count Number of Teams	Medium
📎	1396	Design Underground System	Medium
	1397	Find All Good Strings	Hard
🔒	1398	Customers Who Bought Products A and B but Not C	Medium
	1399	Count Largest Group	Easy
	1400	Construct K Palindrome Strings	Medium
	1401	Circle and Rectangle Overlapping	Medium
	1402	Reducing Dishes	Hard
	1403	Minimum Subsequence in Non-Increasing Order	Easy
	1404	Number of Steps to Reduce a Number in Binary Representation to One	Medium
	1405	Longest Happy String	Medium
	1406	Stone Game III	Hard
	1407	Top Travellers	Easy
📎	1408	String Matching in an Array	Easy
	1409	Queries on a Permutation With Key	Medium
	1410	HTML Entity Parser	Medium
	1411	Number of Ways to Paint N × 3 Grid	Hard
🔒	1412	Find the Quiet Students in All Exams	Hard
📎	1413	Minimum Value to Get Positive Step by Step Sum	Easy
	1414	Find the Minimum Number of Fibonacci Numbers Whose Sum Is K	Medium
	1415	The k-th Lexicographical String of All Happy Strings of Length n	Medium
	1416	Restore The Array	Hard
	1417	Reformat The String	Easy
	1418	Display Table of Food Orders in a Restaurant	Medium
📎	1419	Minimum Number of Frogs Croaking	Medium
	1420	Build Array Where You Can Find The Maximum Exactly K Comparisons	Hard
🔒	1421	NPV Queries	Easy
	1422	Maximum Score After Splitting a String	Easy
📎	1423	Maximum Points You Can Obtain from Cards	Medium
	1424	Diagonal Traverse II	Medium
	1425	Constrained Subsequence Sum	Hard
🔒	1426	Counting Elements	Easy
🔒	1427	Perform String Shifts	Easy
🔒	1428	Leftmost Column with at Least a One	Medium
🔒	1429	First Unique Number	Medium
🔒	1430	Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree	Medium
	1431	Kids With the Greatest Number of Candies	Easy
	1432	Max Difference You Can Get From Changing an Integer	Medium
	1433	Check If a String Can Break Another String	Medium
	1434	Number of Ways to Wear Different Hats to Each Other	Hard
🔒	1435	Create a Session Bar Chart	Easy
	1436	Destination City	Easy
📎	1437	Check If All 1's Are at Least Length K Places Away	Easy
	1438	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Medium
	1439	Find the Kth Smallest Sum of a Matrix With Sorted Rows	Hard
🔒	1440	Evaluate Boolean Expression	Medium
	1441	Build an Array With Stack Operations	Medium
	1442	Count Triplets That Can Form Two Arrays of Equal XOR	Medium
📎	1443	Minimum Time to Collect All Apples in a Tree	Medium
	1444	Number of Ways of Cutting a Pizza	Hard
🔒	1445	Apples & Oranges	Medium
📎	1446	Consecutive Characters	Easy
	1447	Simplified Fractions	Medium
📎	1448	Count Good Nodes in Binary Tree	Medium
	1449	Form Largest Integer With Digits That Add up to Target	Hard
	1450	Number of Students Doing Homework at a Given Time	Easy
	1451	Rearrange Words in a Sentence	Medium
	1452	People Whose List of Favorite Companies Is Not a Subset of Another List	Medium
	1453	Maximum Number of Darts Inside of a Circular Dartboard	Hard
🔒	1454	Active Users	Medium
📎	1455	Check If a Word Occurs As a Prefix of Any Word in a Sentence	Easy
	1456	Maximum Number of Vowels in a Substring of Given Length	Medium
📎	1457	Pseudo-Palindromic Paths in a Binary Tree	Medium
	1458	Max Dot Product of Two Subsequences	Hard
🔒	1459	Rectangles Area	Medium
	1460	Make Two Arrays Equal by Reversing Subarrays	Easy
📎	1461	Check If a String Contains All Binary Codes of Size K	Medium
📎	1462	Course Schedule IV	Medium
📎	1463	Cherry Pickup II	Hard
📎	1464	Maximum Product of Two Elements in an Array	Easy
📎	1465	Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts	Medium
📎	1466	Reorder Routes to Make All Paths Lead to the City Zero	Medium
	1467	Probability of a Two Boxes Having The Same Number of Distinct Balls	Hard
🔒	1468	Calculate Salaries	Medium
🔒	1469	Find All The Lonely Nodes	Easy
📎	1470	Shuffle the Array	Easy
📎	1471	The k Strongest Values in an Array	Medium
	1472	Design Browser History	Medium
📎	1473	Paint House III	Hard
🔒	1474	Delete N Nodes After M Nodes of a Linked List	Easy
	1475	Final Prices With a Special Discount in a Shop	Easy
	1476	Subrectangle Queries	Medium
	1477	Find Two Non-overlapping Sub-arrays Each With Target Sum	Medium
	1478	Allocate Mailboxes	Hard
🔒	1479	Sales by Day of the Week	Hard
📎	1480	Running Sum of 1d Array	Easy
	1481	Least Number of Unique Integers after K Removals	Medium
📎	1482	Minimum Number of Days to Make m Bouquets	Medium
	1483	Kth Ancestor of a Tree Node	Hard
	1484	Group Sold Products By The Date	Easy
🔒	1485	Clone Binary Tree With Random Pointer	Medium
📎	1486	XOR Operation in an Array	Easy
	1487	Making File Names Unique	Medium
📎	1488	Avoid Flood in The City	Medium
	1489	Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree	Hard
🔒	1490	Clone N-ary Tree	Medium
📎	1491	Average Salary Excluding the Minimum and Maximum Salary	Easy
	1492	The kth Factor of n	Medium
	1493	Longest Subarray of 1's After Deleting One Element	Medium
	1494	Parallel Courses II	Hard
🔒	1495	Friendly Movies Streamed Last Month	Easy
	1496	Path Crossing	Easy
	1497	Check If Array Pairs Are Divisible by k	Medium
📎	1498	Number of Subsequences That Satisfy the Given Sum Condition	Medium
	1499	Max Value of Equation	Hard
🔒	1500	Design a File Sharing System	Medium

### 1501 ~ 1750

</>	#	Solution Title	Difficulty
🔒	1501	Countries You Can Safely Invest In	Medium
📎	1502	Can Make Arithmetic Progression From Sequence	Easy
	1503	Last Moment Before All Ants Fall Out of a Plank	Medium
	1504	Count Submatrices With All Ones	Medium
	1505	Minimum Possible Integer After at Most K Adjacent Swaps On Digits	Hard
🔒	1506	Find Root of N-Ary Tree	Medium
📎	1507	Reformat Date	Easy
📎	1508	Range Sum of Sorted Subarray Sums	Medium
📎	1509	Minimum Difference Between Largest and Smallest Value in Three Moves	Medium
📎	1510	Stone Game IV	Hard
🔒	1511	Customer Order Frequency	Easy
📎	1512	Number of Good Pairs	Easy
	1513	Number of Substrings With Only 1s	Medium
	1514	Path with Maximum Probability	Medium
	1515	Best Position for a Service Centre	Hard
🔒	1516	Move Sub-Tree of N-Ary Tree	Hard
🔒	1517	Find Users With Valid E-Mails	Easy
	1518	Water Bottles	Easy
📎	1519	Number of Nodes in the Sub-Tree With the Same Label	Medium
	1520	Maximum Number of Non-Overlapping Substrings	Hard
	1521	Find a Value of a Mysterious Function Closest to Target	Hard
🔒	1522	Diameter of N-Ary Tree	Medium
📎	1523	Count Odd Numbers in an Interval Range	Easy
	1524	Number of Sub-arrays With Odd Sum	Medium
	1525	Number of Good Ways to Split a String	Medium
	1526	Minimum Number of Increments on Subarrays to Form a Target Array	Hard
	1527	Patients With a Condition	Easy
	1528	Shuffle String	Easy
📎	1529	Minimum Suffix Flips	Medium
	1530	Number of Good Leaf Nodes Pairs	Medium
📎	1531	String Compression II	Hard
🔒	1532	The Most Recent Three Orders	Medium
🔒	1533	Find the Index of the Large Integer	Medium
📎	1534	Count Good Triplets	Easy
	1535	Find the Winner of an Array Game	Medium
	1536	Minimum Swaps to Arrange a Binary Grid	Medium
	1537	Get the Maximum Score	Hard
🔒	1538	Guess the Majority in a Hidden Array	Medium
📎	1539	Kth Missing Positive Number	Easy
	1540	Can Convert String in K Moves	Medium
	1541	Minimum Insertions to Balance a Parentheses String	Medium
	1542	Find Longest Awesome Substring	Hard
🔒	1543	Fix Product Name Format	Easy
📎	1544	Make The String Great	Easy
📎	1545	Find Kth Bit in Nth Binary String	Medium
	1546	Maximum Number of Non-Overlapping Subarrays With Sum Equals Target	Medium
	1547	Minimum Cost to Cut a Stick	Hard
🔒	1548	The Most Similar Path in a Graph	Hard
🔒	1549	The Most Recent Orders for Each Product	Medium
	1550	Three Consecutive Odds	Easy
	1551	Minimum Operations to Make Array Equal	Medium
📎	1552	Magnetic Force Between Two Balls	Medium
	1553	Minimum Number of Days to Eat N Oranges	Hard
🔒	1554	Strings Differ by One Character	Medium
🔒	1555	Bank Account Summary	Medium
📎	1556	Thousand Separator	Easy
📎	1557	Minimum Number of Vertices to Reach All Nodes	Medium
	1558	Minimum Numbers of Function Calls to Make Target Array	Medium
📎	1559	Detect Cycles in 2D Grid	Medium
	1560	Most Visited Sector in a Circular Track	Easy
	1561	Maximum Number of Coins You Can Get	Medium
📎	1562	Find Latest Group of Size M	Medium
	1563	Stone Game V	Hard
🔒	1564	Put Boxes Into the Warehouse I	Medium
🔒	1565	Unique Orders and Customers Per Month	Easy
	1566	Detect Pattern of Length M Repeated K or More Times	Easy
📎	1567	Maximum Length of Subarray With Positive Product	Medium
	1568	Minimum Number of Days to Disconnect Island	Hard
	1569	Number of Ways to Reorder Array to Get Same BST	Hard
🔒	1570	Dot Product of Two Sparse Vectors	Medium
🔒	1571	Warehouse Manager	Easy
📎	1572	Matrix Diagonal Sum	Easy
	1573	Number of Ways to Split a String	Medium
📎	1574	Shortest Subarray to be Removed to Make Array Sorted	Medium
	1575	Count All Possible Routes	Hard
📎	1576	Replace All ?'s to Avoid Consecutive Repeating Characters	Easy
	1577	Number of Ways Where Square of Number Is Equal to Product of Two Numbers	Medium
📎	1578	Minimum Time to Make Rope Colorful	Medium
	1579	Remove Max Number of Edges to Keep Graph Fully Traversable	Hard
🔒	1580	Put Boxes Into the Warehouse II	Medium
	1581	Customer Who Visited but Did Not Make Any Transactions	Easy
📎	1582	Special Positions in a Binary Matrix	Easy
	1583	Count Unhappy Friends	Medium
📎	1584	Min Cost to Connect All Points	Medium
	1585	Check If String Is Transformable With Substring Sort Operations	Hard
🔒	1586	Binary Search Tree Iterator II	Medium
	1587	Bank Account Summary II	Easy
📎	1588	Sum of All Odd Length Subarrays	Easy
	1589	Maximum Sum Obtained of Any Permutation	Medium
	1590	Make Sum Divisible by P	Medium
	1591	Strange Printer II	Hard
	1592	Rearrange Spaces Between Words	Easy
	1593	Split a String Into the Max Number of Unique Substrings	Medium
	1594	Maximum Non Negative Product in a Matrix	Medium
	1595	Minimum Cost to Connect Two Groups of Points	Hard
🔒	1596	The Most Frequently Ordered Products for Each Customer	Medium
🔒	1597	Build Binary Expression Tree From Infix Expression	Hard
	1598	Crawler Log Folder	Easy
	1599	Maximum Profit of Operating a Centennial Wheel	Medium
	1600	Throne Inheritance	Medium
	1601	Maximum Number of Achievable Transfer Requests	Hard
🔒	1602	Find Nearest Right Node in Binary Tree	Medium
📎	1603	Design Parking System	Easy
	1604	Alert Using Same Key-Card Three or More Times in a One Hour Period	Medium
	1605	Find Valid Matrix Given Row and Column Sums	Medium
	1606	Find Servers That Handled Most Number of Requests	Hard
🔒	1607	Sellers With No Sales	Easy
📎	1608	Special Array With X Elements Greater Than or Equal X	Easy
📎	1609	Even Odd Tree	Medium
	1610	Maximum Number of Visible Points	Hard
	1611	Minimum One Bit Operations to Make Integers Zero	Hard
🔒	1612	Check If Two Expression Trees are Equivalent	Medium
🔒	1613	Find the Missing IDs	Medium
📎	1614	Maximum Nesting Depth of the Parentheses	Easy
📎	1615	Maximal Network Rank	Medium
	1616	Split Two Strings to Make Palindrome	Medium
	1617	Count Subtrees With Max Distance Between Cities	Hard
🔒	1618	Maximum Font to Fit a Sentence in a Screen	Medium
	1619	Mean of Array After Removing Some Elements	Easy
	1620	Coordinate With Maximum Network Quality	Medium
	1621	Number of Sets of K Non-Overlapping Line Segments	Medium
	1622	Fancy Sequence	Hard
🔒	1623	All Valid Triplets That Can Represent a Country	Easy
	1624	Largest Substring Between Two Equal Characters	Easy
	1625	Lexicographically Smallest String After Applying Operations	Medium
📎	1626	Best Team With No Conflicts	Medium
	1627	Graph Connectivity With Threshold	Hard
🔒	1628	Design an Expression Tree With Evaluate Function	Medium
📎	1629	Slowest Key	Easy
📎	1630	Arithmetic Subarrays	Medium
📎	1631	Path With Minimum Effort	Medium
	1632	Rank Transform of a Matrix	Hard
🔒	1633	Percentage of Users Attended a Contest	Easy
🔒	1634	Add Two Polynomials Represented as Linked Lists	Medium
🔒	1635	Hopper Company Queries I	Hard
	1636	Sort Array by Increasing Frequency	Easy
	1637	Widest Vertical Area Between Two Points Containing No Points	Medium
	1638	Count Substrings That Differ by One Character	Medium
	1639	Number of Ways to Form a Target String Given a Dictionary	Hard
	1640	Check Array Formation Through Concatenation	Easy
📎	1641	Count Sorted Vowel Strings	Medium
📎	1642	Furthest Building You Can Reach	Medium
	1643	Kth Smallest Instructions	Hard
🔒	1644	Lowest Common Ancestor of a Binary Tree II	Medium
🔒	1645	Hopper Company Queries II	Hard
	1646	Get Maximum in Generated Array	Easy
📎	1647	Minimum Deletions to Make Character Frequencies Unique	Medium
📎	1648	Sell Diminishing-Valued Colored Balls	Medium
	1649	Create Sorted Array through Instructions	Hard
🔒	1650	Lowest Common Ancestor of a Binary Tree III	Medium
🔒	1651	Hopper Company Queries III	Hard
📎	1652	Defuse the Bomb	Easy
	1653	Minimum Deletions to Make String Balanced	Medium
📎	1654	Minimum Jumps to Reach Home	Medium
	1655	Distribute Repeating Integers	Hard
📎	1656	Design an Ordered Stream	Easy
📎	1657	Determine if Two Strings Are Close	Medium
📎	1658	Minimum Operations to Reduce X to Zero	Medium
	1659	Maximize Grid Happiness	Hard
🔒	1660	Correct a Binary Tree	Medium
🔒	1661	Average Time of Process per Machine	Easy
📎	1662	Check If Two String Arrays are Equivalent	Easy
📎	1663	Smallest String With A Given Numeric Value	Medium
	1664	Ways to Make a Fair Array	Medium
	1665	Minimum Initial Energy to Finish Tasks	Hard
🔒	1666	Change the Root of a Binary Tree	Medium
	1667	Fix Names in a Table	Easy
📎	1668	Maximum Repeating Substring	Easy
	1669	Merge In Between Linked Lists	Medium
	1670	Design Front Middle Back Queue	Medium
	1671	Minimum Number of Removals to Make Mountain Array	Hard
📎	1672	Richest Customer Wealth	Easy
	1673	Find the Most Competitive Subsequence	Medium
📎	1674	Minimum Moves to Make Array Complementary	Medium
📎	1675	Minimize Deviation in Array	Hard
🔒	1676	Lowest Common Ancestor of a Binary Tree IV	Medium
🔒	1677	Product's Worth Over Invoices	Easy
📎	1678	Goal Parser Interpretation	Easy
📎	1679	Max Number of K-Sum Pairs	Medium
📎	1680	Concatenation of Consecutive Binary Numbers	Medium
	1681	Minimum Incompatibility	Hard
🔒	1682	Longest Palindromic Subsequence II	Medium
🔒	1683	Invalid Tweets	Easy
📎	1684	Count the Number of Consistent Strings	Easy
	1685	Sum of Absolute Differences in a Sorted Array	Medium
	1686	Stone Game VI	Medium
	1687	Delivering Boxes from Storage to Ports	Hard
📎	1688	Count of Matches in Tournament	Easy
📎	1689	Partitioning Into Minimum Number Of Deci-Binary Numbers	Medium
	1690	Stone Game VII	Medium
	1691	Maximum Height by Stacking Cuboids	Hard
🔒	1692	Count Ways to Distribute Candies	Hard
	1693	Daily Leads and Partners	Easy
	1694	Reformat Phone Number	Easy
📎	1695	Maximum Erasure Value	Medium
📎	1696	Jump Game VI	Medium
	1697	Checking Existence of Edge Length Limited Paths	Hard
🔒	1698	Number of Distinct Substrings in a String	Medium
🔒	1699	Number of Calls Between Two Persons	Medium
	1700	Number of Students Unable to Eat Lunch	Easy
	1701	Average Waiting Time	Medium
	1702	Maximum Binary String After Change	Medium
	1703	Minimum Adjacent Swaps for K Consecutive Ones	Hard
📎	1704	Determine if String Halves Are Alike	Easy
📎	1705	Maximum Number of Eaten Apples	Medium
📎	1706	Where Will the Ball Fall	Medium
	1707	Maximum XOR With an Element From Array	Hard
🔒	1708	Largest Subarray Length K	Easy
🔒	1709	Biggest Window Between Visits	Medium
📎	1710	Maximum Units on a Truck	Easy
	1711	Count Good Meals	Medium
📎	1712	Ways to Split Array Into Three Subarrays	Medium
	1713	Minimum Operations to Make a Subsequence	Hard
🔒	1714	Sum Of Special Evenly-Spaced Elements In Array	Hard
🔒	1715	Count Apples and Oranges	Medium
📎	1716	Calculate Money in Leetcode Bank	Easy
	1717	Maximum Score From Removing Substrings	Medium
	1718	Construct the Lexicographically Largest Valid Sequence	Medium
	1719	Number Of Ways To Reconstruct A Tree	Hard
📎	1720	Decode XORed Array	Easy
📎	1721	Swapping Nodes in a Linked List	Medium
	1722	Minimize Hamming Distance After Swap Operations	Medium
	1723	Find Minimum Time to Finish All Jobs	Hard
🔒	1724	Checking Existence of Edge Length Limited Paths II	Hard
	1725	Number Of Rectangles That Can Form The Largest Square	Easy
	1726	Tuple with Same Product	Medium
	1727	Largest Submatrix With Rearrangements	Medium
	1728	Cat and Mouse II	Hard
	1729	Find Followers Count	Easy
🔒	1730	Shortest Path to Get Food	Medium
🔒	1731	The Number of Employees Which Report to Each Employee	Easy
📎	1732	Find the Highest Altitude	Easy
	1733	Minimum Number of People to Teach	Medium
	1734	Decode XORed Permutation	Medium
	1735	Count Ways to Make Array With Product	Hard
	1736	Latest Time by Replacing Hidden Digits	Easy
	1737	Change Minimum Characters to Satisfy One of Three Conditions	Medium
	1738	Find Kth Largest XOR Coordinate Value	Medium
	1739	Building Boxes	Hard
🔒	1740	Find Distance in a Binary Tree	Medium
	1741	Find Total Time Spent by Each Employee	Easy
	1742	Maximum Number of Balls in a Box	Easy
	1743	Restore the Array From Adjacent Pairs	Medium
	1744	Can You Eat Your Favorite Candy on Your Favorite Day?	Medium
	1745	Palindrome Partitioning IV	Hard
🔒	1746	Maximum Subarray Sum After One Operation	Medium
🔒	1747	Leetflex Banned Accounts	Medium
📎	1748	Sum of Unique Elements	Easy
	1749	Maximum Absolute Sum of Any Subarray	Medium
	1750	Minimum Length of String After Deleting Similar Ends	Medium

### 1751 ~ 2000

</>	#	Solution Title	Difficulty
	1751	Maximum Number of Events That Can Be Attended II	Hard
📎	1752	Check if Array Is Sorted and Rotated	Easy
	1753	Maximum Score From Removing Stones	Medium
	1754	Largest Merge Of Two Strings	Medium
	1755	Closest Subsequence Sum	Hard
🔒	1756	Design Most Recently Used Queue	Medium
	1757	Recyclable and Low Fat Products	Easy
	1758	Minimum Changes To Make Alternating Binary String	Easy
	1759	Count Number of Homogenous Substrings	Medium
📎	1760	Minimum Limit of Balls in a Bag	Medium
	1761	Minimum Degree of a Connected Trio in a Graph	Hard
🔒	1762	Buildings With an Ocean View	Medium
	1763	Longest Nice Substring	Easy
	1764	Form Array by Concatenating Subarrays of Another Array	Medium
	1765	Map of Highest Peak	Medium
	1766	Tree of Coprimes	Hard
🔒	1767	Find the Subtasks That Did Not Execute	Hard
📎	1768	Merge Strings Alternately	Easy
	1769	Minimum Number of Operations to Move All Balls to Each Box	Medium
📎	1770	Maximum Score from Performing Multiplication Operations	Hard
	1771	Maximize Palindrome Length From Subsequences	Hard
🔒	1772	Sort Features by Popularity	Medium
	1773	Count Items Matching a Rule	Easy
	1774	Closest Dessert Cost	Medium
	1775	Equal Sum Arrays With Minimum Number of Operations	Medium
	1776	Car Fleet II	Hard
🔒	1777	Product's Price for Each Store	Easy
🔒	1778	Shortest Path in a Hidden Grid	Medium
📎	1779	Find Nearest Point That Has the Same X or Y Coordinate	Easy
	1780	Check if Number is a Sum of Powers of Three	Medium
	1781	Sum of Beauty of All Substrings	Medium
	1782	Count Pairs Of Nodes	Hard
🔒	1783	Grand Slam Titles	Medium
📎	1784	Check if Binary String Has at Most One Segment of Ones	Easy
	1785	Minimum Elements to Add to Form a Given Sum	Medium
📎	1786	Number of Restricted Paths From First to Last Node	Medium
	1787	Make the XOR of All Segments Equal to Zero	Hard
🔒	1788	Maximize the Beauty of the Garden	Hard
🔒	1789	Primary Department for Each Employee	Easy
📎	1790	Check if One String Swap Can Make Strings Equal	Easy
📎	1791	Find Center of Star Graph	Easy
	1792	Maximum Average Pass Ratio	Medium
	1793	Maximum Score of a Good Subarray	Hard
🔒	1794	Count Pairs of Equal Substrings With Minimum Difference	Medium
	1795	Rearrange Products Table	Easy
	1796	Second Largest Digit in a String	Easy
📎	1797	Design Authentication Manager	Medium
	1798	Maximum Number of Consecutive Values You Can Make	Medium
	1799	Maximize Score After N Operations	Hard
	1800	Maximum Ascending Subarray Sum	Easy
	1801	Number of Orders in the Backlog	Medium
📎	1802	Maximum Value at a Given Index in a Bounded Array	Medium
	1803	Count Pairs With XOR in a Range	Hard
🔒	1804	Implement Trie II (Prefix Tree)	Medium
📎	1805	Number of Different Integers in a String	Easy
	1806	Minimum Number of Operations to Reinitialize a Permutation	Medium
	1807	Evaluate the Bracket Pairs of a String	Medium
	1808	Maximize Number of Nice Divisors	Hard
🔒	1809	Ad-Free Sessions	Easy
🔒	1810	Minimum Path Cost in a Hidden Grid	Medium
🔒	1811	Find Interview Candidates	Medium
	1812	Determine Color of a Chessboard Square	Easy
	1813	Sentence Similarity III	Medium
	1814	Count Nice Pairs in an Array	Medium
	1815	Maximum Number of Groups Getting Fresh Donuts	Hard
📎	1816	Truncate Sentence	Easy
	1817	Finding the Users Active Minutes	Medium
📎	1818	Minimum Absolute Sum Difference	Medium
	1819	Number of Different Subsequences GCDs	Hard
🔒	1820	Maximum Number of Accepted Invitations	Medium
🔒	1821	Find Customers With Positive Revenue this Year	Easy
📎	1822	Sign of the Product of an Array	Easy
📎	1823	Find the Winner of the Circular Game	Medium
	1824	Minimum Sideway Jumps	Medium
	1825	Finding MK Average	Hard
🔒	1826	Faulty Sensor	Easy
📎	1827	Minimum Operations to Make the Array Increasing	Easy
📎	1828	Queries on Number of Points Inside a Circle	Medium
📎	1829	Maximum XOR for Each Query	Medium
	1830	Minimum Number of Operations to Make String Sorted	Hard
🔒	1831	Maximum Transaction Each Day	Medium
📎	1832	Check if the Sentence Is Pangram	Easy
📎	1833	Maximum Ice Cream Bars	Medium
📎	1834	Single-Threaded CPU	Medium
	1835	Find XOR Sum of All Pairs Bitwise AND	Hard
🔒	1836	Remove Duplicates From an Unsorted Linked List	Medium
📎	1837	Sum of Digits in Base K	Easy
📎	1838	Frequency of the Most Frequent Element	Medium
	1839	Longest Substring Of All Vowels in Order	Medium
	1840	Maximum Building Height	Hard
🔒	1841	League Statistics	Medium
🔒	1842	Next Palindrome Using Same Digits	Hard
🔒	1843	Suspicious Bank Accounts	Medium
📎	1844	Replace All Digits with Characters	Easy
📎	1845	Seat Reservation Manager	Medium
	1846	Maximum Element After Decreasing and Rearranging	Medium
	1847	Closest Room	Hard
	1848	Minimum Distance to the Target Element	Easy
	1849	Splitting a String Into Descending Consecutive Values	Medium
	1850	Minimum Adjacent Swaps to Reach the Kth Smallest Number	Medium
	1851	Minimum Interval to Include Each Query	Hard
🔒	1852	Distinct Numbers in Each Subarray	Medium
🔒	1853	Convert Date Format	Easy
	1854	Maximum Population Year	Easy
📎	1855	Maximum Distance Between a Pair of Values	Medium
	1856	Maximum Subarray Min-Product	Medium
	1857	Largest Color Value in a Directed Graph	Hard
🔒	1858	Longest Word With All Prefixes	Medium
📎	1859	Sorting the Sentence	Easy
	1860	Incremental Memory Leak	Medium
	1861	Rotating the Box	Medium
	1862	Sum of Floored Pairs	Hard
📎	1863	Sum of All Subset XOR Totals	Easy
	1864	Minimum Number of Swaps to Make the Binary String Alternating	Medium
	1865	Finding Pairs With a Certain Sum	Medium
	1866	Number of Ways to Rearrange Sticks With K Sticks Visible	Hard
🔒	1867	Orders With Maximum Quantity Above Average	Medium
🔒	1868	Product of Two Run-Length Encoded Arrays	Medium
	1869	Longer Contiguous Segments of Ones than Zeros	Easy
📎	1870	Minimum Speed to Arrive on Time	Medium
	1871	Jump Game VII	Medium
	1872	Stone Game VIII	Hard
	1873	Calculate Special Bonus	Easy
🔒	1874	Minimize Product Sum of Two Arrays	Medium
🔒	1875	Group Employees of the Same Salary	Medium
	1876	Substrings of Size Three with Distinct Characters	Easy
	1877	Minimize Maximum Pair Sum in Array	Medium
	1878	Get Biggest Three Rhombus Sums in a Grid	Medium
📎	1879	Minimum XOR Sum of Two Arrays	Hard
	1880	Check if Word Equals Summation of Two Words	Easy
📎	1881	Maximum Value after Insertion	Medium
	1882	Process Tasks Using Servers	Medium
	1883	Minimum Skips to Arrive at Meeting On Time	Hard
	1884	Egg Drop With 2 Eggs and N Floors	Medium
🔒	1885	Count Pairs in Two Arrays	Medium
📎	1886	Determine Whether Matrix Can Be Obtained By Rotation	Easy
📎	1887	Reduction Operations to Make the Array Elements Equal	Medium
	1888	Minimum Number of Flips to Make the Binary String Alternating	Medium
	1889	Minimum Space Wasted From Packaging	Hard
	1890	The Latest Login in 2020	Easy
🔒	1891	Cutting Ribbons	Medium
🔒	1892	Page Recommendations II	Hard
	1893	Check if All the Integers in a Range Are Covered	Easy
📎	1894	Find the Student that Will Replace the Chalk	Medium
	1895	Largest Magic Square	Medium
	1896	Minimum Cost to Change the Final Value of Expression	Hard
	1897	Redistribute Characters to Make All Strings Equal	Easy
📎	1898	Maximum Number of Removable Characters	Medium
	1899	Merge Triplets to Form Target Triplet	Medium
	1900	The Earliest and Latest Rounds Where Players Compete	Hard
📎	1901	Find a Peak Element II	Medium
🔒	1902	Depth of BST Given Insertion Order	Medium
📎	1903	Largest Odd Number in String	Easy
	1904	The Number of Full Rounds You Have Played	Medium
📎	1905	Count Sub Islands	Medium
	1906	Minimum Absolute Difference Queries	Medium
🔒	1907	Count Salary Categories	Medium
🔒	1908	Game of Nim	Medium
	1909	Remove One Element to Make the Array Strictly Increasing	Easy
	1910	Remove All Occurrences of a Substring	Medium
	1911	Maximum Alternating Subsequence Sum	Medium
	1912	Design Movie Rental System	Hard
	1913	Maximum Product Difference Between Two Pairs	Easy
	1914	Cyclically Rotating a Grid	Medium
	1915	Number of Wonderful Substrings	Medium
	1916	Count Ways to Build Rooms in an Ant Colony	Hard
🔒	1917	Leetcodify Friends Recommendations	Hard
🔒	1918	Kth Smallest Subarray Sum	Medium
🔒	1919	Leetcodify Similar Friends	Hard
📎	1920	Build Array from Permutation	Easy
	1921	Eliminate Maximum Number of Monsters	Medium
	1922	Count Good Numbers	Medium
	1923	Longest Common Subpath	Hard
🔒	1924	Erect the Fence II	Hard
📎	1925	Count Square Sum Triples	Easy
📎	1926	Nearest Exit from Entrance in Maze	Medium
	1927	Sum Game	Medium
	1928	Minimum Cost to Reach Destination in Time	Hard
📎	1929	Concatenation of Array	Easy
	1930	Unique Length-3 Palindromic Subsequences	Medium
	1931	Painting a Grid With Three Different Colors	Hard
	1932	Merge BSTs to Create Single BST	Hard
🔒	1933	Check if String Is Decomposable Into Value-Equal Substrings	Easy
🔒	1934	Confirmation Rate	Medium
	1935	Maximum Number of Words You Can Type	Easy
	1936	Add Minimum Number of Rungs	Medium
	1937	Maximum Number of Points with Cost	Medium
	1938	Maximum Genetic Difference Query	Hard
🔒	1939	Users That Actively Request Confirmation Messages	Easy
🔒	1940	Longest Common Subsequence Between Sorted Arrays	Medium
📎	1941	Check if All Characters Have Equal Number of Occurrences	Easy
	1942	The Number of the Smallest Unoccupied Chair	Medium
	1943	Describe the Painting	Medium
	1944	Number of Visible People in a Queue	Hard
	1945	Sum of Digits of String After Convert	Easy
	1946	Largest Number After Mutating Substring	Medium
	1947	Maximum Compatibility Score Sum	Medium
	1948	Delete Duplicate Folders in System	Hard
🔒	1949	Strong Friendship	Medium
🔒	1950	Maximum of Minimum Values in All Subarrays	Medium
🔒	1951	All the Pairs With the Maximum Number of Common Followers	Medium
📎	1952	Three Divisors	Easy
	1953	Maximum Number of Weeks for Which You Can Work	Medium
	1954	Minimum Garden Perimeter to Collect Enough Apples	Medium
	1955	Count Number of Special Subsequences	Hard
🔒	1956	Minimum Time For K Virus Variants to Spread	Hard
	1957	Delete Characters to Make Fancy String	Easy
	1958	Check if Move is Legal	Medium
	1959	Minimum Total Space Wasted With K Resizing Operations	Medium
	1960	Maximum Product of the Length of Two Palindromic Substrings	Hard
📎	1961	Check If String Is a Prefix of Array	Easy
📎	1962	Remove Stones to Minimize the Total	Medium
📎	1963	Minimum Number of Swaps to Make the String Balanced	Medium
	1964	Find the Longest Valid Obstacle Course at Each Position	Hard
	1965	Employees With Missing Information	Easy
🔒	1966	Binary Searchable Numbers in an Unsorted Array	Medium
📎	1967	Number of Strings That Appear as Substrings in Word	Easy
📎	1968	Array With Elements Not Equal to Average of Neighbors	Medium
	1969	Minimum Non-Zero Product of the Array Elements	Medium
	1970	Last Day Where You Can Still Cross	Hard
📎	1971	Find if Path Exists in Graph	Easy
🔒	1972	First and Last Call On the Same Day	Hard
🔒	1973	Count Nodes Equal to Sum of Descendants	Medium
	1974	Minimum Time to Type Word Using Special Typewriter	Easy
	1975	Maximum Matrix Sum	Medium
	1976	Number of Ways to Arrive at Destination	Medium
	1977	Number of Ways to Separate Numbers	Hard
🔒	1978	Employees Whose Manager Left the Company	Easy
	1979	Find Greatest Common Divisor of Array	Easy
	1980	Find Unique Binary String	Medium
	1981	Minimize the Difference Between Target and Chosen Elements	Medium
	1982	Find Array Given Subset Sums	Hard
🔒	1983	Widest Pair of Indices With Equal Range Sum	Medium
	1984	Minimum Difference Between Highest and Lowest of K Scores	Easy
	1985	Find the Kth Largest Integer in the Array	Medium
	1986	Minimum Number of Work Sessions to Finish the Tasks	Medium
	1987	Number of Unique Good Subsequences	Hard
🔒	1988	Find Cutoff Score for Each School	Medium
🔒	1989	Maximum Number of People That Can Be Caught in Tag	Medium
🔒	1990	Count the Number of Experiments	Medium
📎	1991	Find the Middle Index in Array	Easy
	1992	Find All Groups of Farmland	Medium
	1993	Operations on Tree	Medium
	1994	The Number of Good Subsets	Hard
	1995	Count Special Quadruplets	Easy
📎	1996	The Number of Weak Characters in the Game	Medium
	1997	First Day Where You Have Been in All the Rooms	Medium
	1998	GCD Sort of an Array	Hard
🔒	1999	Smallest Greater Multiple Made of Two Digits	Medium
📎	2000	Reverse Prefix of Word	Easy

### 2001 ~ 2250

</>	#	Solution Title	Difficulty
	2001	Number of Pairs of Interchangeable Rectangles	Medium
	2002	Maximum Product of the Length of Two Palindromic Subsequences	Medium
	2003	Smallest Missing Genetic Value in Each Subtree	Hard
🔒	2004	The Number of Seniors and Juniors to Join the Company	Hard
🔒	2005	Subtree Removal Game with Fibonacci Tree	Hard
📎	2006	Count Number of Pairs With Absolute Difference K	Easy
📎	2007	Find Original Array From Doubled Array	Medium
	2008	Maximum Earnings From Taxi	Medium
	2009	Minimum Number of Operations to Make Array Continuous	Hard
🔒	2010	The Number of Seniors and Juniors to Join the Company II	Hard
📎	2011	Final Value of Variable After Performing Operations	Easy
	2012	Sum of Beauty in the Array	Medium
	2013	Detect Squares	Medium
	2014	Longest Subsequence Repeated k Times	Hard
🔒	2015	Average Height of Buildings in Each Segment	Medium
	2016	Maximum Difference Between Increasing Elements	Easy
	2017	Grid Game	Medium
📎	2018	Check if Word Can Be Placed In Crossword	Medium
	2019	The Score of Students Solving Math Expression	Hard
🔒	2020	Number of Accounts That Did Not Stream	Medium
🔒	2021	Brightest Position on Street	Medium
📎	2022	Convert 1D Array Into 2D Array	Easy
	2023	Number of Pairs of Strings With Concatenation Equal to Target	Medium
	2024	Maximize the Confusion of an Exam	Medium
	2025	Maximum Number of Ways to Partition an Array	Hard
🔒	2026	Low-Quality Problems	Easy
	2027	Minimum Moves to Convert String	Easy
	2028	Find Missing Observations	Medium
	2029	Stone Game IX	Medium
	2030	Smallest K-Length Subsequence With Occurrences of a Letter	Hard
🔒	2031	Count Subarrays With More Ones Than Zeros	Medium
📎	2032	Two Out of Three	Easy
	2033	Minimum Operations to Make a Uni-Value Grid	Medium
	2034	Stock Price Fluctuation	Medium
	2035	Partition Array Into Two Arrays to Minimize Sum Difference	Hard
🔒	2036	Maximum Alternating Subarray Sum	Medium
	2037	Minimum Number of Moves to Seat Everyone	Easy
	2038	Remove Colored Pieces if Both Neighbors are the Same Color	Medium
	2039	The Time When the Network Becomes Idle	Medium
	2040	Kth Smallest Product of Two Sorted Arrays	Hard
🔒	2041	Accepted Candidates From the Interviews	Medium
📎	2042	Check if Numbers Are Ascending in a Sentence	Easy
	2043	Simple Bank System	Medium
	2044	Count Number of Maximum Bitwise-OR Subsets	Medium
	2045	Second Minimum Time to Reach Destination	Hard
🔒	2046	Sort Linked List Already Sorted Using Absolute Values	Medium
	2047	Number of Valid Words in a Sentence	Easy
	2048	Next Greater Numerically Balanced Number	Medium
	2049	Count Nodes With the Highest Score	Medium
	2050	Parallel Courses III	Hard
🔒	2051	The Category of Each Member in the Store	Medium
🔒	2052	Minimum Cost to Separate Sentence Into Rows	Medium
📎	2053	Kth Distinct String in an Array	Easy
	2054	Two Best Non-Overlapping Events	Medium
	2055	Plates Between Candles	Medium
	2056	Number of Valid Move Combinations On Chessboard	Hard
📎	2057	Smallest Index With Equal Value	Easy
	2058	Find the Minimum and Maximum Number of Nodes Between Critical Points	Medium
	2059	Minimum Operations to Convert Number	Medium
	2060	Check if an Original String Exists Given Two Encoded Strings	Hard
🔒	2061	Number of Spaces Cleaning Robot Cleaned	Medium
	2062	Count Vowel Substrings of a String	Easy
	2063	Vowels of All Substrings	Medium
	2064	Minimized Maximum of Products Distributed to Any Store	Medium
	2065	Maximum Path Quality of a Graph	Hard
🔒	2066	Account Balance	Medium
🔒	2067	Number of Equal Count Substrings	Medium
	2068	Check Whether Two Strings are Almost Equivalent	Easy
	2069	Walking Robot Simulation II	Medium
	2070	Most Beautiful Item for Each Query	Medium
	2071	Maximum Number of Tasks You Can Assign	Hard
🔒	2072	The Winner University	Easy
	2073	Time Needed to Buy Tickets	Easy
	2074	Reverse Nodes in Even Length Groups	Medium
	2075	Decode the Slanted Ciphertext	Medium
	2076	Process Restricted Friend Requests	Hard
🔒	2077	Paths in Maze That Lead to Same Room	Medium
	2078	Two Furthest Houses With Different Colors	Easy
	2079	Watering Plants	Medium
	2080	Range Frequency Queries	Medium
	2081	Sum of k-Mirror Numbers	Hard
🔒	2082	The Number of Rich Customers	Easy
🔒	2083	Substrings That Begin and End With the Same Letter	Medium
🔒	2084	Drop Type 1 Orders for Customers With Type 0 Orders	Medium
	2085	Count Common Words With One Occurrence	Easy
	2086	Minimum Number of Food Buckets to Feed the Hamsters	Medium
	2087	Minimum Cost Homecoming of a Robot in a Grid	Medium
	2088	Count Fertile Pyramids in a Land	Hard
	2089	Find Target Indices After Sorting Array	Easy
📎	2090	K Radius Subarray Averages	Medium
	2091	Removing Minimum and Maximum From Array	Medium
	2092	Find All People With Secret	Hard
🔒	2093	Minimum Cost to Reach City With Discounts	Medium
	2094	Finding 3-Digit Even Numbers	Easy
📎	2095	Delete the Middle Node of a Linked List	Medium
	2096	Step-By-Step Directions From a Binary Tree Node to Another	Medium
	2097	Valid Arrangement of Pairs	Hard
🔒	2098	Subsequence of Size K With the Largest Even Sum	Medium
	2099	Find Subsequence of Length K With the Largest Sum	Easy
	2100	Find Good Days to Rob the Bank	Medium
	2101	Detonate the Maximum Bombs	Medium
	2102	Sequentially Ordinal Rank Tracker	Hard
	2103	Rings and Rods	Easy
	2104	Sum of Subarray Ranges	Medium
	2105	Watering Plants II	Medium
	2106	Maximum Fruits Harvested After at Most K Steps	Hard
🔒	2107	Number of Unique Flavors After Sharing K Candies	Medium
	2108	Find First Palindromic String in the Array	Easy
	2109	Adding Spaces to a String	Medium
	2110	Number of Smooth Descent Periods of a Stock	Medium
	2111	Minimum Operations to Make the Array K-Increasing	Hard
🔒	2112	The Airport With the Most Traffic	Medium
🔒	2113	Elements in Array After Removing and Replacing Elements	Medium
	2114	Maximum Number of Words Found in Sentences	Easy
	2115	Find All Possible Recipes from Given Supplies	Medium
	2116	Check if a Parentheses String Can Be Valid	Medium
	2117	Abbreviating the Product of a Range	Hard
🔒	2118	Build the Equation	Hard
	2119	A Number After a Double Reversal	Easy
	2120	Execution of All Suffix Instructions Staying in a Grid	Medium
	2121	Intervals Between Identical Elements	Medium
	2122	Recover the Original Array	Hard
🔒	2123	Minimum Operations to Remove Adjacent Ones in Matrix	Hard
	2124	Check if All A's Appears Before All B's	Easy
	2125	Number of Laser Beams in a Bank	Medium
	2126	Destroying Asteroids	Medium
	2127	Maximum Employees to Be Invited to a Meeting	Hard
🔒	2128	Remove All Ones With Row and Column Flips	Medium
	2129	Capitalize the Title	Easy
	2130	Maximum Twin Sum of a Linked List	Medium
📎	2131	Longest Palindrome by Concatenating Two Letter Words	Medium
	2132	Stamping the Grid	Hard
	2133	Check if Every Row and Column Contains All Numbers	Easy
📎	2134	Minimum Swaps to Group All 1's Together II	Medium
	2135	Count Words Obtained After Adding a Letter	Medium
📎	2136	Earliest Possible Day of Full Bloom	Hard
🔒	2137	Pour Water Between Buckets to Make Water Levels Equal	Medium
	2138	Divide a String Into Groups of Size k	Easy
	2139	Minimum Moves to Reach Target Score	Medium
	2140	Solving Questions With Brainpower	Medium
	2141	Maximum Running Time of N Computers	Hard
🔒	2142	The Number of Passengers in Each Bus I	Medium
🔒	2143	Choose Numbers From Two Arrays in Range	Hard
	2144	Minimum Cost of Buying Candies With Discount	Easy
	2145	Count the Hidden Sequences	Medium
	2146	K Highest Ranked Items Within a Price Range	Medium
	2147	Number of Ways to Divide a Long Corridor	Hard
	2148	Count Elements With Strictly Smaller and Greater Elements	Easy
📎	2149	Rearrange Array Elements by Sign	Medium
	2150	Find All Lonely Numbers in the Array	Medium
	2151	Maximum Good People Based on Statements	Hard
🔒	2152	Minimum Number of Lines to Cover Points	Medium
🔒	2153	The Number of Passengers in Each Bus II	Hard
📎	2154	Keep Multiplying Found Values by Two	Easy
	2155	All Divisions With the Highest Score of a Binary Array	Medium
	2156	Find Substring With Given Hash Value	Hard
	2157	Groups of Strings	Hard
🔒	2158	Amount of New Area Painted Each Day	Hard
🔒	2159	Order Two Columns Independently	Medium
	2160	Minimum Sum of Four Digit Number After Splitting Digits	Easy
	2161	Partition Array According to Given Pivot	Medium
	2162	Minimum Cost to Set Cooking Time	Medium
	2163	Minimum Difference in Sums After Removal of Elements	Hard
📎	2164	Sort Even and Odd Indices Independently	Easy
	2165	Smallest Value of the Rearranged Number	Medium
	2166	Design Bitset	Medium
	2167	Minimum Time to Remove All Cars Containing Illegal Goods	Hard
🔒	2168	Unique Substrings With Equal Digit Frequency	Medium
	2169	Count Operations to Obtain Zero	Easy
	2170	Minimum Operations to Make the Array Alternating	Medium
	2171	Removing Minimum Number of Magic Beans	Medium
	2172	Maximum AND Sum of Array	Hard
🔒	2173	Longest Winning Streak	Hard
🔒	2174	Remove All Ones With Row and Column Flips II	Medium
🔒	2175	The Change in Global Rankings	Medium
	2176	Count Equal and Divisible Pairs in an Array	Easy
	2177	Find Three Consecutive Integers That Sum to a Given Number	Medium
	2178	Maximum Split of Positive Even Integers	Medium
	2179	Count Good Triplets in an Array	Hard
📎	2180	Count Integers With Even Digit Sum	Easy
	2181	Merge Nodes in Between Zeros	Medium
	2182	Construct String With Repeat Limit	Medium
	2183	Count Array Pairs Divisible by K	Hard
🔒	2184	Number of Ways to Build Sturdy Brick Wall	Medium
	2185	Counting Words With a Given Prefix	Easy
	2186	Minimum Number of Steps to Make Two Strings Anagram II	Medium
	2187	Minimum Time to Complete Trips	Medium
	2188	Minimum Time to Finish the Race	Hard
🔒	2189	Number of Ways to Build House of Cards	Medium
	2190	Most Frequent Number Following Key In an Array	Easy
	2191	Sort the Jumbled Numbers	Medium
	2192	All Ancestors of a Node in a Directed Acyclic Graph	Medium
	2193	Minimum Number of Moves to Make Palindrome	Hard
	2194	Cells in a Range on an Excel Sheet	Easy
	2195	Append K Integers With Minimal Sum	Medium
	2196	Create Binary Tree From Descriptions	Medium
	2197	Replace Non-Coprime Numbers in Array	Hard
🔒	2198	Number of Single Divisor Triplets	Medium
🔒	2199	Finding the Topic of Each Post	Hard
📎	2200	Find All K-Distant Indices in an Array	Easy
	2201	Count Artifacts That Can Be Extracted	Medium
	2202	Maximize the Topmost Element After K Moves	Medium
	2203	Minimum Weighted Subgraph With the Required Paths	Hard
🔒	2204	Distance to a Cycle in Undirected Graph	Hard
🔒	2205	The Number of Users That Are Eligible for Discount	Easy
📎	2206	Divide Array Into Equal Pairs	Easy
	2207	Maximize Number of Subsequences in a String	Medium
	2208	Minimum Operations to Halve Array Sum	Medium
	2209	Minimum White Tiles After Covering With Carpets	Hard
	2210	Count Hills and Valleys in an Array	Easy
	2211	Count Collisions on a Road	Medium
	2212	Maximum Points in an Archery Competition	Medium
	2213	Longest Substring of One Repeating Character	Hard
🔒	2214	Minimum Health to Beat Game	Medium
	2215	Find the Difference of Two Arrays	Easy
	2216	Minimum Deletions to Make Array Beautiful	Medium
	2217	Find Palindrome With Fixed Length	Medium
	2218	Maximum Value of K Coins From Piles	Hard
🔒	2219	Maximum Sum Score of Array	Medium
	2220	Minimum Bit Flips to Convert Number	Easy
📎	2221	Find Triangular Sum of an Array	Medium
	2222	Number of Ways to Select Buildings	Medium
	2223	Sum of Scores of Built Strings	Hard
	2224	Minimum Number of Operations to Convert Time	Easy
📎	2225	Find Players With Zero or One Losses	Medium
	2226	Maximum Candies Allocated to K Children	Medium
	2227	Encrypt and Decrypt Strings	Hard
🔒	2228	Users With Two Purchases Within Seven Days	Medium
🔒	2229	Check if an Array Is Consecutive	Easy
🔒	2230	The Users That Are Eligible for Discount	Easy
	2231	Largest Number After Digit Swaps by Parity	Easy
	2232	Minimize Result by Adding Parentheses to Expression	Medium
	2233	Maximum Product After K Increments	Medium
	2234	Maximum Total Beauty of the Gardens	Hard
📎	2235	Add Two Integers	Easy
📎	2236	Root Equals Sum of Children	Easy
🔒	2237	Count Positions on Street With Required Brightness	Medium
🔒	2238	Number of Times a Driver Was a Passenger	Medium
📎	2239	Find Closest Number to Zero	Easy
	2240	Number of Ways to Buy Pens and Pencils	Medium
	2241	Design an ATM Machine	Medium
	2242	Maximum Score of a Node Sequence	Hard
	2243	Calculate Digit Sum of a String	Easy
📎	2244	Minimum Rounds to Complete All Tasks	Medium
	2245	Maximum Trailing Zeros in a Cornered Path	Medium
📎	2246	Longest Path With Different Adjacent Characters	Hard
🔒	2247	Maximum Cost of Trip With K Highways	Hard
📎	2248	Intersection of Multiple Arrays	Easy
	2249	Count Lattice Points Inside a Circle	Medium
	2250	Count Number of Rectangles Containing Each Point	Medium

### 2251 ~ 2500

</>	#	Solution Title	Difficulty
	2251	Number of Flowers in Full Bloom	Hard
🔒	2252	Dynamic Pivoting of a Table	Hard
🔒	2253	Dynamic Unpivoting of a Table	Hard
🔒	2254	Design Video Sharing Platform	Hard
📎	2255	Count Prefixes of a Given String	Easy
📎	2256	Minimum Average Difference	Medium
	2257	Count Unguarded Cells in the Grid	Medium
	2258	Escape the Spreading Fire	Hard
	2259	Remove Digit From Number to Maximize Result	Easy
	2260	Minimum Consecutive Cards to Pick Up	Medium
	2261	K Divisible Elements Subarrays	Medium
	2262	Total Appeal of A String	Hard
🔒	2263	Make Array Non-decreasing or Non-increasing	Hard
	2264	Largest 3-Same-Digit Number in String	Easy
	2265	Count Nodes Equal to Average of Subtree	Medium
📎	2266	Count Number of Texts	Medium
	2267	Check if There Is a Valid Parentheses String Path	Hard
🔒	2268	Minimum Number of Keypresses	Medium
	2269	Find the K-Beauty of a Number	Easy
	2270	Number of Ways to Split Array	Medium
	2271	Maximum White Tiles Covered by a Carpet	Medium
	2272	Substring With Largest Variance	Hard
	2273	Find Resultant Array After Removing Anagrams	Easy
📎	2274	Maximum Consecutive Floors Without Special Floors	Medium
	2275	Largest Combination With Bitwise AND Greater Than Zero	Medium
	2276	Count Integers in Intervals	Hard
🔒	2277	Closest Node to Path in Tree	Hard
	2278	Percentage of Letter in String	Easy
📎	2279	Maximum Bags With Full Capacity of Rocks	Medium
	2280	Minimum Lines to Represent a Line Chart	Medium
	2281	Sum of Total Strength of Wizards	Hard
🔒	2282	Number of People That Can Be Seen in a Grid	Medium
	2283	Check if Number Has Equal Digit Count and Digit Value	Easy
	2284	Sender With Largest Word Count	Medium
	2285	Maximum Total Importance of Roads	Medium
	2286	Booking Concert Tickets in Groups	Hard
	2287	Rearrange Characters to Make Target String	Easy
	2288	Apply Discount to Prices	Medium
	2289	Steps to Make Array Non-decreasing	Medium
	2290	Minimum Obstacle Removal to Reach Corner	Hard
🔒	2291	Maximum Profit From Trading Stocks	Medium
🔒	2292	Products With Three or More Orders in Two Consecutive Years	Medium
📎	2293	Min Max Game	Easy
	2294	Partition Array Such That Maximum Difference Is K	Medium
	2295	Replace Elements in an Array	Medium
	2296	Design a Text Editor	Hard
🔒	2297	Jump Game VIII	Medium
🔒	2298	Tasks Count in the Weekend	Medium
	2299	Strong Password Checker II	Easy
	2300	Successful Pairs of Spells and Potions	Medium
	2301	Match Substring After Replacement	Hard
	2302	Count Subarrays With Score Less Than K	Hard
	2303	Calculate Amount Paid in Taxes	Easy
	2304	Minimum Path Cost in a Grid	Medium
	2305	Fair Distribution of Cookies	Medium
	2306	Naming a Company	Hard
🔒	2307	Check for Contradictions in Equations	Hard
🔒	2308	Arrange Table by Gender	Medium
	2309	Greatest English Letter in Upper and Lower Case	Easy
	2310	Sum of Numbers With Units Digit K	Medium
📎	2311	Longest Binary Subsequence Less Than or Equal to K	Medium
	2312	Selling Pieces of Wood	Hard
🔒	2313	Minimum Flips in Binary Tree to Get Result	Hard
🔒	2314	The First Day of the Maximum Recorded Degree in Each City	Medium
	2315	Count Asterisks	Easy
	2316	Count Unreachable Pairs of Nodes in an Undirected Graph	Medium
	2317	Maximum XOR After Operations	Medium
	2318	Number of Distinct Roll Sequences	Hard
📎	2319	Check if Matrix Is X-Matrix	Easy
	2320	Count Number of Ways to Place Houses	Medium
	2321	Maximum Score Of Spliced Array	Hard
	2322	Minimum Score After Removals on a Tree	Hard
🔒	2323	Find Minimum Time to Finish All Jobs II	Medium
🔒	2324	Product Sales Analysis IV	Medium
	2325	Decode the Message	Easy
	2326	Spiral Matrix IV	Medium
	2327	Number of People Aware of a Secret	Medium
	2328	Number of Increasing Paths in a Grid	Hard
🔒	2329	Product Sales Analysis V	Easy
🔒	2330	Valid Palindrome IV	Medium
📎	2331	Evaluate Boolean Binary Tree	Easy
	2332	The Latest Time to Catch a Bus	Medium
	2333	Minimum Sum of Squared Difference	Medium
	2334	Subarray With Elements Greater Than Varying Threshold	Hard
	2335	Minimum Amount of Time to Fill Cups	Easy
	2336	Smallest Number in Infinite Set	Medium
	2337	Move Pieces to Obtain a String	Medium
	2338	Count the Number of Ideal Arrays	Hard
🔒	2339	All the Matches of the League	Easy
🔒	2340	Minimum Adjacent Swaps to Make a Valid Array	Medium
	2341	Maximum Number of Pairs in Array	Easy
	2342	Max Sum of a Pair With Equal Sum of Digits	Medium
	2343	Query Kth Smallest Trimmed Number	Medium
	2344	Minimum Deletions to Make Array Divisible	Hard
🔒	2345	Finding the Number of Visible Mountains	Medium
🔒	2346	Compute the Rank as a Percentage	Medium
📎	2347	Best Poker Hand	Easy
	2348	Number of Zero-Filled Subarrays	Medium
	2349	Design a Number Container System	Medium
	2350	Shortest Impossible Sequence of Rolls	Hard
	2351	First Letter to Appear Twice	Easy
	2352	Equal Row and Column Pairs	Medium
	2353	Design a Food Rating System	Medium
	2354	Number of Excellent Pairs	Hard
🔒	2355	Maximum Number of Books You Can Take	Hard
🔒	2356	Number of Unique Subjects Taught by Each Teacher	Easy
	2357	Make Array Zero by Subtracting Equal Amounts	Easy
	2358	Maximum Number of Groups Entering a Competition	Medium
📎	2359	Find Closest Node to Given Two Nodes	Medium
	2360	Longest Cycle in a Graph	Hard
🔒	2361	Minimum Costs Using the Train Line	Hard
🔒	2362	Generate the Invoice	Hard
	2363	Merge Similar Items	Easy
	2364	Count Number of Bad Pairs	Medium
	2365	Task Scheduler II	Medium
	2366	Minimum Replacements to Sort the Array	Hard
	2367	Number of Arithmetic Triplets	Easy
📎	2368	Reachable Nodes With Restrictions	Medium
	2369	Check if There is a Valid Partition For The Array	Medium
	2370	Longest Ideal Subsequence	Medium
🔒	2371	Minimize Maximum Value in a Grid	Hard
🔒	2372	Calculate the Influence of Each Salesperson	Medium
	2373	Largest Local Values in a Matrix	Easy
	2374	Node With Highest Edge Score	Medium
	2375	Construct Smallest Number From DI String	Medium
	2376	Count Special Integers	Hard
🔒	2377	Sort the Olympic Table	Easy
🔒	2378	Choose Edges to Maximize Score in a Tree	Medium
	2379	Minimum Recolors to Get K Consecutive Black Blocks	Easy
	2380	Time Needed to Rearrange a Binary String	Medium
	2381	Shifting Letters II	Medium
	2382	Maximum Segment Sum After Removals	Hard
	2383	Minimum Hours of Training to Win a Competition	Easy
	2384	Largest Palindromic Number	Medium
	2385	Amount of Time for Binary Tree to Be Infected	Medium
	2386	Find the K-Sum of an Array	Hard
🔒	2387	Median of a Row Wise Sorted Matrix	Medium
🔒	2388	Change Null Values in a Table to the Previous Value	Medium
📎	2389	Longest Subsequence With Limited Sum	Easy
	2390	Removing Stars From a String	Medium
	2391	Minimum Amount of Time to Collect Garbage	Medium
	2392	Build a Matrix With Conditions	Hard
🔒	2393	Count Strictly Increasing Subarrays	Medium
🔒	2394	Employees With Deductions	Medium
📎	2395	Find Subarrays With Equal Sum	Easy
	2396	Strictly Palindromic Number	Medium
	2397	Maximum Rows Covered by Columns	Medium
	2398	Maximum Number of Robots Within Budget	Hard
📎	2399	Check Distances Between Same Letters	Easy
	2400	Number of Ways to Reach a Position After Exactly k Steps	Medium
	2401	Longest Nice Subarray	Medium
	2402	Meeting Rooms III	Hard
🔒	2403	Minimum Time to Kill All Monsters	Hard
	2404	Most Frequent Even Element	Easy
	2405	Optimal Partition of String	Medium
	2406	Divide Intervals Into Minimum Number of Groups	Medium
	2407	Longest Increasing Subsequence II	Hard
🔒	2408	Design SQL	Medium
	2409	Count Days Spent Together	Easy
	2410	Maximum Matching of Players With Trainers	Medium
	2411	Smallest Subarrays With Maximum Bitwise OR	Medium
	2412	Minimum Money Required Before Transactions	Hard
📎	2413	Smallest Even Multiple	Easy
	2414	Length of the Longest Alphabetical Continuous Substring	Medium
	2415	Reverse Odd Levels of Binary Tree	Medium
	2416	Sum of Prefix Scores of Strings	Hard
🔒	2417	Closest Fair Integer	Medium
📎	2418	Sort the People	Easy
	2419	Longest Subarray With Maximum Bitwise AND	Medium
	2420	Find All Good Indices	Medium
📎	2421	Number of Good Paths	Hard
🔒	2422	Merge Operations to Turn Array Into a Palindrome	Medium
📎	2423	Remove Letter To Equalize Frequency	Easy
	2424	Longest Uploaded Prefix	Medium
	2425	Bitwise XOR of All Pairings	Medium
	2426	Number of Pairs Satisfying Inequality	Hard
📎	2427	Number of Common Factors	Easy
	2428	Maximum Sum of an Hourglass	Medium
	2429	Minimize XOR	Medium
	2430	Maximum Deletions on a String	Hard
🔒	2431	Maximize Total Tastiness of Purchased Fruits	Medium
	2432	The Employee That Worked on the Longest Task	Easy
	2433	Find The Original Array of Prefix Xor	Medium
	2434	Using a Robot to Print the Lexicographically Smallest String	Medium
	2435	Paths in Matrix Whose Sum Is Divisible by K	Hard
🔒	2436	Minimum Split Into Subarrays With GCD Greater Than One	Medium
	2437	Number of Valid Clock Times	Easy
	2438	Range Product Queries of Powers	Medium
	2439	Minimize Maximum of Array	Medium
	2440	Create Components With Same Value	Hard
	2441	Largest Positive Integer That Exists With Its Negative	Easy
	2442	Count Number of Distinct Integers After Reverse Operations	Medium
	2443	Sum of Number and Its Reverse	Medium
	2444	Count Subarrays With Fixed Bounds	Hard
🔒	2445	Number of Nodes With Value One	Medium
	2446	Determine if Two Events Have Conflict	Easy
	2447	Number of Subarrays With GCD Equal to K	Medium
	2448	Minimum Cost to Make Array Equal	Hard
	2449	Minimum Number of Operations to Make Arrays Similar	Hard
🔒	2450	Number of Distinct Binary Strings After Applying Operations	Medium
	2451	Odd String Difference	Easy
	2452	Words Within Two Edits of Dictionary	Medium
	2453	Destroy Sequential Targets	Medium
	2454	Next Greater Element IV	Hard
	2455	Average Value of Even Numbers That Are Divisible by Three	Easy
	2456	Most Popular Video Creator	Medium
	2457	Minimum Addition to Make Integer Beautiful	Medium
	2458	Height of Binary Tree After Subtree Removal Queries	Hard
🔒	2459	Sort Array by Moving Items to Empty Space	Hard
	2460	Apply Operations to an Array	Easy
	2461	Maximum Sum of Distinct Subarrays With Length K	Medium
	2462	Total Cost to Hire K Workers	Medium
	2463	Minimum Total Distance Traveled	Hard
🔒	2464	Minimum Subarrays in a Valid Split	Medium
	2465	Number of Distinct Averages	Easy
	2466	Count Ways To Build Good Strings	Medium
	2467	Most Profitable Path in a Tree	Medium
	2468	Split Message Based on Limit	Hard
	2469	Convert the Temperature	Easy
	2470	Number of Subarrays With LCM Equal to K	Medium
	2471	Minimum Number of Operations to Sort a Binary Tree by Level	Medium
	2472	Maximum Number of Non-overlapping Palindrome Substrings	Hard
🔒	2473	Minimum Cost to Buy Apples	Medium
🔒	2474	Customers With Strictly Increasing Purchases	Hard
	2475	Number of Unequal Triplets in Array	Easy
	2476	Closest Nodes Queries in a Binary Search Tree	Medium
	2477	Minimum Fuel Cost to Report to the Capital	Medium
	2478	Number of Beautiful Partitions	Hard
🔒	2479	Maximum XOR of Two Non-Overlapping Subtrees	Hard
🔒	2480	Form a Chemical Bond	Easy
	2481	Minimum Cuts to Divide a Circle	Easy
	2482	Difference Between Ones and Zeros in Row and Column	Medium
	2483	Minimum Penalty for a Shop	Medium
	2484	Count Palindromic Subsequences	Hard
	2485	Find the Pivot Integer	Easy
	2486	Append Characters to String to Make Subsequence	Medium
	2487	Remove Nodes From Linked List	Medium
	2488	Count Subarrays With Median K	Hard
🔒	2489	Number of Substrings With Fixed Ratio	Medium
	2490	Circular Sentence	Easy
	2491	Divide Players Into Teams of Equal Skill	Medium
	2492	Minimum Score of a Path Between Two Cities	Medium
	2493	Divide Nodes Into the Maximum Number of Groups	Hard
🔒	2494	Merge Overlapping Events in the Same Hall	Hard
🔒	2495	Number of Subarrays Having Even Product	Medium
	2496	Maximum Value of a String in an Array	Easy
	2497	Maximum Star Sum of a Graph	Medium
	2498	Frog Jump II	Medium
	2499	Minimum Total Cost to Make Arrays Unequal	Hard
	2500	Delete Greatest Value in Each Row	Easy

### 2501 ~ 2552

</>	#	Solution Title	Difficulty
	2501	Longest Square Streak in an Array	Medium
	2502	Design Memory Allocator	Medium
	2503	Maximum Number of Points From Grid Queries	Hard
🔒	2504	Concatenate the Name and the Profession	Easy
🔒	2505	Bitwise OR of All Subsequence Sums	Medium
	2506	Count Pairs Of Similar Strings	Easy
	2507	Smallest Value After Replacing With Sum of Prime Factors	Medium
	2508	Add Edges to Make Degrees of All Nodes Even	Hard
	2509	Cycle Length Queries in a Tree	Hard
🔒	2510	Check if There is a Path With Equal Number of 0's And 1's	Medium
	2511	Maximum Enemy Forts That Can Be Captured	Easy
	2512	Reward Top K Students	Medium
	2513	Minimize the Maximum of Two Arrays	Medium
	2514	Count Anagrams	Hard
	2515	Shortest Distance to Target String in a Circular Array	Easy
	2516	Take K of Each Character From Left and Right	Medium
	2517	Maximum Tastiness of Candy Basket	Medium
	2518	Number of Great Partitions	Hard
🔒	2519	Count the Number of K-Big Indices	Hard
	2520	Count the Digits That Divide a Number	Easy
	2521	Distinct Prime Factors of Product of Array	Medium
	2522	Partition String Into Substrings With Values at Most K	Medium
	2523	Closest Prime Numbers in Range	Medium
🔒	2524	Maximum Frequency Score of a Subarray	Hard
	2525	Categorize Box According to Criteria	Easy
	2526	Find Consecutive Integers from a Data Stream	Medium
	2527	Find Xor-Beauty of Array	Medium
	2528	Maximize the Minimum Powered City	Hard
	2529	Maximum Count of Positive Integer and Negative Integer	Easy
	2530	Maximal Score After Applying K Operations	Medium
	2531	Make Number of Distinct Characters Equal	Medium
	2532	Time to Cross a Bridge	Hard
🔒	2533	Number of Good Binary Strings	Medium
🔒	2534	Time Taken to Cross the Door	Hard
	2535	Difference Between Element Sum and Digit Sum of an Array	Easy
	2536	Increment Submatrices by One	Medium
	2537	Count the Number of Good Subarrays	Medium
	2538	Difference Between Maximum and Minimum Price Sum	Hard
🔒	2539	Count the Number of Good Subsequences	Medium
	2540	Minimum Common Value	Easy
	2541	Minimum Operations to Make Array Equal II	Medium
	2542	Maximum Subsequence Score	Medium
	2543	Check if Point Is Reachable	Hard
	2544	Alternating Digit Sum	Easy
	2545	Sort the Students by Their Kth Score	Medium
	2546	Apply Bitwise Operations to Make Strings Equal	Medium
	2547	Minimum Cost to Split an Array	Hard
🔒	2548	Maximum Price to Fill a Bag	Medium
	2549	Count Distinct Numbers on Board	Easy
	2550	Count Collisions of Monkeys on a Polygon	Medium
	2551	Put Marbles in Bags	Hard
	2552	Count Increasing Quadruplets	Hard

Last 25 Submissions

Time	#	</>	Question Title	Difficulty
2023-02-04 14:33	2399	📎	Check Distances Between Same Letters	Easy
2023-02-03 13:19	2413	📎	Smallest Even Multiple	Easy
2023-02-02 19:03	2427	📎	Number of Common Factors	Easy
2023-02-01 20:07	2206	📎	Divide Array Into Equal Pairs	Easy
2023-01-31 20:56	1626	📎	Best Team With No Conflicts	Medium
2023-01-30 15:42	2347	📎	Best Poker Hand	Easy
2023-01-29 11:28	460	📎	LFU Cache	Hard
2023-01-27 14:33	472	📎	Concatenated Words	Hard
2023-01-26 13:37	787	📎	Cheapest Flights Within K Stops	Medium
2023-01-25 15:48	2359	📎	Find Closest Node to Given Two Nodes	Medium
2023-01-24 15:56	909	📎	Snakes and Ladders	Medium
2023-01-23 14:30	2164	📎	Sort Even and Odd Indices Independently	Easy
2023-01-22 12:29	2395	📎	Find Subarrays With Equal Sum	Easy
2023-01-21 09:29	2423	📎	Remove Letter To Equalize Frequency	Easy
2023-01-20 10:23	491	📎	Non-decreasing Subsequences	Medium
2023-01-19 12:04	974	📎	Subarray Sums Divisible by K	Medium
2023-01-18 17:53	2418	📎	Sort the People	Easy
2023-01-17 21:30	2319	📎	Check if Matrix Is X-Matrix	Easy
2023-01-16 16:08	2239	📎	Find Closest Number to Zero	Easy
2023-01-16 16:02	2235	📎	Add Two Integers	Easy
2023-01-15 17:33	2421	📎	Number of Good Paths	Hard
2023-01-14 13:54	1061	📎	Lexicographically Smallest Equivalent String	Medium
2023-01-13 19:09	2246	📎	Longest Path With Different Adjacent Characters	Hard
2023-01-12 16:04	1519	📎	Number of Nodes in the Sub-Tree With the Same Label	Medium
2023-01-11 18:59	1443	📎	Minimum Time to Collect All Apples in a Tree	Medium

Previous Logs

Month	Submissions	Easy	Medium	Hard
February_2023	4	4	0	0
January_2023	31	16	11	4
December_2022	32	27	5	0
November_2022	30	21	6	3
October_2022	33	22	7	4
September_2022	38	10	19	9
August_2022	48	15	24	9
July_2022	47	6	37	4
June_2022	30	8	19	3
May_2022	42	12	26	4
April_2022	56	37	19	0
March_2022	49	6	39	4
February_2022	69	15	43	11
January_2022	32	8	18	6
December_2021	33	11	15	7
November_2021	41	18	17	6
October_2021	115	24	78	13
September_2021	133	53	73	7

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Daily Leetcode in C++

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