| 421 | Maximum XOR of Two Numbers in an Array | Medium |
| 423 | Reconstruct Original Digits from English | Medium |
| 424 | Longest Repeating Character Replacement | Medium |
| 427 | Construct Quad Tree | Medium |
| 429 | N-ary Tree Level Order Traversal | Medium |
| 430 | Flatten a Multilevel Doubly Linked List | Medium |
| 433 | Minimum Genetic Mutation | Medium |
| 435 | Non-overlapping Intervals | Medium |
| 436 | Find Right Interval | Medium |
| 437 | Path Sum III | Medium |
| 438 | Find All Anagrams in a String | Medium |
| 442 | Find All Duplicates in an Array | Medium |
| 443 | String Compression | Medium |
| 445 | Add Two Numbers II | Medium |
| 447 | Number of Boomerangs | Medium |
| 449 | Serialize and Deserialize BST | Medium |
| 450 | Delete Node in a BST | Medium |
| 451 | Sort Characters By Frequency | Medium |
| 452 | Minimum Number of Arrows to Burst Balloons | Medium |
| 453 | Minimum Moves to Equal Array Elements | Medium |
| 454 | 4Sum II | Medium |
| 456 | 132 Pattern | Medium |
| 457 | Circular Array Loop | Medium |
| 462 | Minimum Moves to Equal Array Elements II | Medium |
| 464 | Can I Win | Medium |
| 467 | Unique Substrings in Wraparound String | Medium |
| 468 | Validate IP Address | Medium |
| 470 | Implement Rand10() Using Rand7() | Medium |
| 473 | Matchsticks to Square | Medium |
| 474 | Ones and Zeroes | Medium |