| 69. Sqrt(x) | Solution | Solve | Easy | | |
| 70. Climbing Stairs | Solution | Solve | Easy | | |
| 71. Simplify Path | Solution | Solve | Medium | | |
| 72. Edit Distance | Solution | Solve | Medium | | |
| 73. Set Matrix Zeroes | Solution | Solve | Medium | | |
| 74. Search a 2D Matrix | Solution | Solve | Medium | | |
| 75. Sort Colors | Solution | Solve | Medium | | |
| 76. Minimum Window Substring | Solution | Solve | Hard | | |
| 78. Subsets | Solution | Solve | Medium | | |
| 79. Word Search | Solution | Solve | Medium | | |
| 82. Remove Duplicates from Sorted List II | Solution | Solve | Medium | | |
| 83. Remove Duplicates from Sorted List | Solution | Solve | Easy | | |
| 84. Largest Rectangle in Histogram | 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 | | |
| 98. Validate Binary Search Tree | Solution | Solve | Medium | | |
| 102. Binary Tree Level Order Traversal | Solution | Solve | Medium | | |
| 103. Binary Tree Zigzag Level Order Traversal | Solution | Solve | Medium | | |
| 104. Maximum Depth of Binary Tree | Solution | Solve | Easy | | |
| 107. Binary Tree Level Order Traversal II | Solution | Solve | Medium | | |
| 113. Path Sum II | Solution | Solve | Medium | | |
| 114. Flatten Binary Tree to Linked List | Solution | Solve | Medium | | |
| 115. Distinct Subsequences | Solution | Solve | Hard | | |
| 116. Populating Next Right Pointers in Each Node | Solution | Solve | Medium | | |
| 120. Triangle | Solution | Solve | Medium | | |
| 121. Best Time to Buy and Sell Stock | Solution | Solve | Easy | | |
| 122. Best Time to Buy and Sell Stock II | Solution | Solve | Medium | | |
| 124. Binary Tree Maximum Path Sum | Solution | Solve | Hard | | |
| 125. Valid Palindrome | Solution | Solve | Easy | | |
| 127. Word Ladder | Solution | Solve | Hard | | |
| 128. Longest Consecutive Sequence | Solution | Solve | Medium | | |
| 130. Surrounded Regions | Solution | Solve | Medium | | |
| 133. Clone Graph | 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 | | |
| 141. Linked List Cycle | Solution | Solve | Easy | | |
| 142. Linked List Cycle II | Solution | Solve | Medium | | |
| 143. Reorder List | Solution | Solve | Medium | | |
| 146. LRU Cache | Solution | Solve | Medium | | |
| 148. Sort List | Solution | Solve | Medium | | |
| 150. Evaluate Reverse Polish Notation | Solution | Solve | Medium | | |
| 151. Reverse Words in a String | Solution | Solve | Medium | | |
| 153. Find Minimum in Rotated Sorted Array | Solution | Solve | Medium | | |
| 155. Min Stack | Solution | Solve | Medium | | |
