| 1. Two Sum |
Java Python |
| 2. Add Two Numbers |
Java Python |
| 3. Longest Substring Without Repeating Characters |
Java Python |
| 11. Container With Most Water |
Java |
| 15. 3Sum |
Java |
| 16. 3Sum Closest |
Java |
| 17. Letter Combinations of a Phone Number |
Java |
| 18. 4Sum |
Java |
| 19. Remove Nth Node From End of List |
Java |
| 20. Valid Parentheses |
Java |
| 21. Merge Two Sorted Lists |
Java |
| 23. Merge k Sorted Lists |
Java |
| 24. Swap Nodes in Pairs |
Java |
| 25. Reverse Nodes in k-Group |
Java |
| 26. Remove Duplicates from Sorted Array |
Java |
| 27. Remove Element |
Java Python |
| 39. Combination Sum |
Java |
| 40. Combination Sum II |
Java |
| 46. Permutations |
Java |
| 47. Permutations II |
Java |
| 49. Group Anagrams |
Java |
| 61. Rotate List |
Java |
| 71. Simplify Path |
Java |
| 75. Sort Colors |
Java |
| 76. Minimum Window Substring |
Java |
| 77. Combinations |
Java |
| 78. Subsets |
Java |
| 80. Remove Duplicates from Sorted Array II |
Java |
| 82. Remove Duplicates from Sorted List II |
Java |
| 83. Remove Duplicates from Sorted List |
Java |
| 86. Partition List |
Java |
| 88. Merge Sorted Array |
Java |
| 90. Subsets II |
Java |
| 92. Reverse Linked List II |
Java |
| 93. Restore IP Addresses |
Java |
| 94. Binary Tree Inorder Traversal |
Java |
| 98. Validate Binary Search Tree |
Java |
| 100. Same Tree |
Java |
| 101. Symmetric Tree |
Java |
| 102. Binary Tree Level Order Traversal |
Java |
| 103. Binary Tree Zigzag Level Order Traversal |
Java |
| 104. Maximum Depth of Binary Tree |
Java |
| 107. Binary Tree Level Order Traversal II |
Java |
| 108. Convert Sorted Array to Binary Search Tree |
Java |
| 110. Balanced Binary Tree |
Java |
| 111. Minimum Depth of Binary Tree |
Java |
| 112. Path Sum |
Java |
| 113. Path Sum II |
Java |
| 125. Valid Palindrome |
Java |
| 126. Word Ladder II |
Java |
| 127. Word Ladder |
Java |
| 129. Sum Root to Leaf Numbers |
Java |
| 131. Palindrome Partitioning |
Java |
| 143. Reorder List |
Java |
| 144. Binary Tree Preorder Traversal |
Java |
| 145. Binary Tree Postorder Traversal |
Java |
| 147. Insertion Sort List |
Java |
| 148. Sort List |
Java |
| 149. Max Points on a Line |
Java |
| 150. Evaluate Reverse Polish Notation |
Java |
| 167. Two Sum II - Input array is sorted |
Java |
| 193. Valid Phone Numbers |
Java |
| 195. Tenth Line |
Java |
| 199. Binary Tree Right Side View |
Java |
| 202. Happy Number |
Java Python |
| 203. Remove Linked List Elements |
Java Python |
| 205. Isomorphic Strings |
Java Python |
| 206. Reverse Linked List |
Java Python |
| 209. Minimum Size Subarray Sum |
Java |
| 215. Kth Largest Element in an Array |
Java |
| 216. Combination Sum III |
Java |
| 217. Contains Duplicate |
Java Python |
| 219. Contains Duplicate II |
Java |
| 222. Count Complete Tree Nodes |
Java |
| 226. Invert Binary Tree |
Java |
| 230. Kth Smallest Element in a BST |
Java |
| 234. Palindrome Linked List |
Java |
| 235. Lowest Common Ancestor of a Binary Search Tree |
Java |
| 236. Lowest Common Ancestor of a Binary Tree |
Java |
| 237. Delete Node in a Linked List |
Java |
| 242. Valid Anagram |
Java |
| 257. Binary Tree Paths |
Java |
| 279. Perfect Squares |
Java |
| 283. Move Zeroes |
Java |
| 290. Word Pattern |
Java |
| 328. Odd Even Linked List |
Java |
| 341. Flatten Nested List Iterator |
Java |
| 344. Reverse String |
Java |
| 345. Reverse Vowels of a String |
Java |
| 347. Top K Frequent Elements |
Java |
| 349. Intersection of Two Arrays |
Java |
| 350. Intersection of Two Arrays II |
Java |
| 401. Binary Watch |
Java |
| 404. Sum of Left Leaves |
Java |
| 437. Path Sum III |
Java |
| 438. Find All Anagrams in a String |
Java |
| 445. Add Two Numbers II |
Java |
| 447. Number of Boomerangs |
Java |
| 450. Delete Node in a BST |
Java |
| 451. Sort Characters By Frequency |
Java |
| 454. 4Sum II |
Java |
| 771. Jewels and Stones |
Java |
| 844. Backspace String Compare |
Java Python |
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