| 178 | Rank Scores | Medium |
| 179 | Largest Number | Medium |
| 180 | Consecutive Numbers | Medium |
| 187 | Repeated DNA Sequences | Medium |
| 199 | Binary Tree Right Side View | Medium |
| 200 | Number of Islands | Medium |
| 201 | Bitwise AND of Numbers Range | Medium |
| 207 | Course Schedule | Medium |
| 208 | Implement Trie (Prefix Tree) | Medium |
| 209 | Minimum Size Subarray Sum | Medium |
| 210 | Course Schedule II | Medium |
| 213 | House Robber II | Medium |
| 215 | Kth Largest Element in an Array | Medium |
| 221 | Maximal Square | Medium |
| 229 | Majority Element II | Medium |
| 230 | Kth Smallest Element in a BST | Medium |
| 237 | Delete Node in a Linked List | Medium |
| 238 | Product of Array Except Self | Medium |
| 240 | Search a 2D Matrix II | Medium |
| 260 | Single Number III | Medium |
| 264 | Ugly Number II | Medium |
| 287 | Find the Duplicate Number | Medium |
| 289 | Game of Life | Medium |
| 300 | Longest Increasing Subsequence | Medium |
| 304 | Range Sum Query 2D - Immutable | Medium |
| 310 | Minimum Height Trees | Medium |
| 319 | Bulb Switcher | Medium |
| 322 | Coin Change | Medium |
| 341 | Flatten Nested List Iterator | Medium |
| 343 | Integer Break | Medium |