| 268 | Missing Number | Easy |
| 273 | Integer to English Words | Hard |
| 274 | H-Index | Medium |
| 275 | H-Index II | Medium |
| 279 | Perfect Squares | Medium |
| 282 | Expression Add Operators | Hard |
| 283 | Move Zeroes | Easy |
| 284 | Peeking Iterator | Medium |
| 287 | Find the Duplicate Number | Medium |
| 289 | Game of Life | Medium |
| 290 | Word Pattern | Easy |
| 292 | Nim Game | Easy |
| 295 | Find Median from Data Stream | Hard |
| 297 | Serialize and Deserialize Binary Tree | Hard |
| 299 | Bulls and Cows | Medium |
| 300 | Longest Increasing Subsequence | Medium |
| 301 | Remove Invalid Parentheses | Hard |
| 303 | Range Sum Query - Immutable | Easy |
| 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 |
| 312 | Burst Balloons | Hard |
| 313 | Super Ugly Number | Medium |
| 315 | Count of Smaller Numbers After Self | Hard |
| 316 | Remove Duplicate Letters | Hard |
| 318 | Maximum Product of Word Lengths | Medium |
| 319 | Bulb Switcher | Medium |
| 321 | Create Maximum Number | Hard |