| 72. Edit Distance | Solution | Solve | Medium | | |
| 74. Search a 2D Matrix | Solution | Solve | Medium | | |
| 75. Sort Colors | Solution | Solve | Medium | | |
| 76. Minimum Window Substring | Solution | Solve | Hard | | |
| 77. Combinations | Solution | Solve | Medium | | |
| 78. Subsets | Solution | Solve | Medium | | |
| 79. Word Search | Solution | Solve | Medium | | |
| 80. Remove Duplicates from Sorted Array II | Solution | Solve | Medium | | |
| 82. Remove Duplicates from Sorted List II | Solution | Solve | Medium | | |
| 84. Largest Rectangle in Histogram | Solution | Solve | Hard | | |
| 85. Maximal Rectangle | Solution | Solve | Hard | | |
| 88. Merge Sorted Array | Solution | Solve | Easy | | |
| 91. Decode Ways | Solution | Solve | Medium | | |
| 92. Reverse Linked List II | Solution | Solve | Medium | | |
| 93. Restore IP Addresses | Solution | Solve | Medium | | |
| 96. Unique Binary Search Trees | Solution | Solve | Medium | | |
| 99. Recover Binary Search Tree | Solution | Solve | Medium | | |
| 101. Symmetric Tree | Solution | Solve | Easy | | |
| 103. Binary Tree Zigzag Level Order Traversal | Solution | Solve | Medium | | |
| 105. Construct Binary Tree from Preorder and Inorder Traversal | Solution | Solve | Medium | | |
| 108. Convert Sorted Array to Binary Search Tree | Solution | Solve | Easy | | |
| 112. Path Sum | Solution | Solve | Easy | | |
| 113. Path Sum II | Solution | Solve | Medium | | |
| 115. Distinct Subsequences | Solution | Solve | Hard | | |
| 121. Best Time to Buy and Sell Stock | Solution | Solve | Easy | | |
| 122. Best Time to Buy and Sell Stock II | Solution | Solve | Medium | | |
| 123. Best Time to Buy and Sell Stock III | Solution | Solve | Hard | | |
| 124. Binary Tree Maximum Path Sum | Solution | Solve | Hard | | |
| 125. Valid Palindrome | Solution | Solve | Easy | | |
| 126. Word Ladder II | Solution | Solve | Hard | | |
| 127. Word Ladder | Solution | Solve | Hard | | |
| 128. Longest Consecutive Sequence | Solution | Solve | Medium | | |
| 134. Gas Station | Solution | Solve | Medium | | |
| 135. Candy | Solution | Solve | Hard | | |
| 138. Copy List with Random Pointer | Solution | Solve | Medium | | |
| 139. Word Break | Solution | Solve | Medium | | |
| 140. Word Break II | Solution | Solve | Hard | | |
| 143. Reorder List | Solution | Solve | Medium | | |
| 146. LRU Cache | Solution | Solve | Medium | | |
| 148. Sort List | Solution | Solve | Medium | | |
| 151. Reverse Words in a String | Solution | Solve | Medium | | |
| 152. Maximum Product Subarray | Solution | Solve | Medium | | |
| 153. Find Minimum in Rotated Sorted Array | Solution | Solve | Medium | | |
| 159. Longest Substring with At Most Two Distinct Characters | Solution | Solve | Medium | | |
| 160. Intersection of Two Linked Lists | Solution | Solve | Easy | | |
| 162. Find Peak Element | Solution | Solve | Medium | | |
| 165. Compare Version Numbers | Solution | Solve | Medium | | |
| 166. Fraction to Recurring Decimal | Solution | Solve | Medium | | |
| 167. Two Sum II - Input Array Is Sorted | Solution | Solve | Medium | | |
| 177. Nth Highest Salary | Solution | Solve | Medium | | |
