| 241 | Different Ways to Add Parentheses | Medium |
| 260 | Single Number III | Medium |
| 264 | Ugly Number II | Medium |
| 274 | H-Index | Medium |
| 275 | H-Index II | Medium |
| 279 | Perfect Squares | Medium |
| 284 | Peeking Iterator | Medium |
| 287 | Find the Duplicate Number | Medium |
| 289 | Game of Life | Medium |
| 299 | Bulls and Cows | Medium |
| 300 | Longest Increasing Subsequence | Medium |
| 304 | Range Sum Query 2D - Immutable | Medium |
| 306 | Additive Number | Medium |
| 307 | Range Sum Query - Mutable | Medium |
| 309 | Best Time to Buy and Sell Stock with Cooldown | Medium |
| 310 | Minimum Height Trees | Medium |
| 313 | Super Ugly Number | Medium |
| 318 | Maximum Product of Word Lengths | Medium |
| 319 | Bulb Switcher | Medium |
| 322 | Coin Change | Medium |
| 324 | Wiggle Sort II | Medium |
| 328 | Odd Even Linked List | Medium |
| 331 | Verify Preorder Serialization of a Binary Tree | Medium |
| 334 | Increasing Triplet Subsequence | Medium |
| 337 | House Robber III | Medium |
| 341 | Flatten Nested List Iterator | Medium |
| 343 | Integer Break | Medium |
| 347 | Top K Frequent Elements | Medium |
| 355 | Design Twitter | Medium |
| 357 | Count Numbers with Unique Digits | Medium |