LeetCode

Practicing algorithm questions listed on LeetCode

Solved so far : 101

Array (46)

#	Title	Difficulty	Note
0001	Two Sum	Easy
0003	Longest Substring Without Repeating Characters	Medium
0004	Median of Two Sorted Arrays	Hard
0011	Container With Most Water	Medium	Two Pointers
0015	3Sum	Medium	Two Pointers
0016	3Sum Closest	Medium	Two Pointers
0018	4Sum	Medium	Two Pointers, Hash Table
0026	Remove Duplicates from Sorted Array	Easy	Two Pointers
0027	Remove Element	Easy	Two Pointers
0031	Next Permutation	Medium
0033	Search in Rotated Sorted Array	Medium	Binary Search
0045	Jump Game II	Medium	Dynamic Programming, Greedy
0046	Permutations	Medium	Backtracking
0053	Maximum Subarray	Easy	Divide and Conquer, Dynamic Programming
0090	Subsets II	Medium	Backtracking, Bit Manipulation
0121	Best Time to Buy and Sell Stock	Easy	Dynamic Programming
0152	Maximum Product Subarray	Medium	Dynamic Programming
0155	Min Stack	Easy	Stack, Design
0167	Two Sum II - Input array is sorted	Easy	Two Pointers, Binary Search
0169	Majority Element	Easy	Hash Table, Sorting, Counting
0215	Kth Largest Element in an Array	Medium	Divide and Conquer, Sorting, Heap
0221	Maximal Square	Medium	Dynamic Programming, Matrix
0238	Product of Array Except Self	Medium	Prefix Sum
0300	Longest Increasing Subsequence	Medium	Binary Search,Dynamic Programming
0347	Top K Frequent Elements	Medium	Hash Table, Sorting, Counting, Heap
0384	Shuffle an Array	Medium	Math Randomized
0414	Third Maximum Number	Easy
0496	Next Greater Element I	Easy	Hash Table, Stack
0540	Single Element in a Sorted Array	Medium	Binary Search
0605	Can Place Flowers	East
1313	Decompress Run-Length Encoded List	Easy
1365	How Many Numbers Are Smaller Than the Current Number	Easy	Hash Table
1389	Create Target Array in the Given Order	Easy
1431	Kids With the Greatest Number of Candies	Easy
1464	Maximum Product of Two Elements in an Array	Easy
1465	Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts	Medium
1470	Shuffle the Array	Easy
1476	Subrectangle Queries	Medium
1480	Running Sum of 1d Array	Easy
1512	Number of Good Pairs	Easy	Hash Table, Math
1672	Richest Customer Wealth	Easy
1769	Minimum Number of Operations to Move All Balls to Each Box	Medium
1773	Count Items Matching a Rule	Easy	String
1854	Maximum Population Year	Easy	Counting
1909	Remove One Element to Make the Array Strictly Increasing	Easy
1920	Build Array from Permutation	Easy

Linked List (7)

#	Title	Difficulty	Note
0002	Add Two Numbers	Medium
0019	Remove Nth Node From End of List	Medium
0021	Merge Two Sorted Lists	Easy	Recursion
0023	Merge k Sorted Lists	Hard	Divide and Conquer, Merge Sort
0025	Reverse Nodes in k-Group	Hard
0206	Reverse Linked List	Easy	Recursion
1290	Convert Binary Number in a Linked List to Integer	Easy

Math (9)

#	Title	Difficulty	Note
0007	Reverse Integer	Easy
0009	Palindrome Number	Easy
0029	Divide Two Numbers	Medium	Bit Manipulation
0050	Pow(x, n)	Medium	Recursion
0149	Max Points on a Line	Hard	Hash Table
0168	Excel Sheet Column Title	Easy
0171	Excel Sheet Column Number	Easy
1281	Subtract the Product and Sum of Digits of an Integer	Easy
1828	Queries on Number of Points Inside a Circle	Easy

String (16)

#	Title	Difficulty	Note
0005	Longest Palindromic Substring	Medium	Dynamic Programming
0008	String to Integer (atoi)	Medium	Math
0014	Longest Common Prefix	Easy
0020	Valid Parenthesis	Easy	Stack
0022	Generate Parentheses	Medium	Backtracking, Dynamic Programming
0065	Valid Number	Hard	Math
0091	Decode Ways	Medium	Dynamic Programming
0125	Valid Palindrome	Easy	Two Pointers
0451	Sort Characters By Frequency	Medium	Hash Table, Sorting, Counting
0763	Partition Labels	Medium	Hash Table, Two Pointers, Greedy
0859	Buddy Strings	Easy
1108	Defanging an IP Address	Easy
1221	Split a String in Balanced Strings	Easy	Greedy
1678	Goal Parser Interpretation	Easy
1689	Partitioning Into Minimum Number Of Deci-Binary Numbers	Medium
1880	Check if Word Equals Summation of Two Words	Easy

Hash Table (7)

#	Title	Difficulty	Note
0012	Integer to Roman	Medium	String, Math
0049	Group Anagrams	Medium	String, Sorting
0133	Clone Graph	Medium	Graph, DFS, BFS
0187	Repeated DNA Sequences	Medium	String, Sliding Window, Bit Manipulation
0692	Top K Frequent Words	Medium	String, Sorting, Counting
0771	Jewels and Stones	Easy
1078	Occurrences After Bigram	Easy

Tree (7)

#	Title	Difficulty	Note
0098	Validate Binary Search Tree	Medium	DFS, BFS
0102	Binary Tree Level Order Traversal	Medium	BFS
0104	Maximum Depth of Binary Tree	Easy	DFS, BFS
0107	Binary Tree Level Order Traversal 2	Medium	BFS
0572	Subtree of Another Tree	Easy	DFS, String Matching
0938	Range Sum of BST	Easy
1302	Deepest Leaves Sum	Medium

Sort (2)

#	Title	Difficulty	Note
1370	Increasing Decreasing String	Easy
1528	Shuffle String	Easy

Bit Manipulation (2)

#	Title	Difficulty	Note
1342	Number of Steps to Reduce a Number to Zero	Easy
1720	Decode XORed Array	Easy

Design (3)

#	Title	Difficulty
0232	Implement Queue using Stacks	Easy
1603	Design Parking System	Easy
1656	Design an Ordered Stream	Easy

Shell (2)

#	Title	Difficulty	Note
0193	Valid Phone Numbers	Easy
0195	Tenth Line	Easy

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LeetCode

Array (46)

Linked List (7)

Math (9)

String (16)

Hash Table (7)

Tree (7)

Sort (2)

Bit Manipulation (2)

Design (3)

Shell (2)

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