| 78 | Subsets | Medium |
| 136 | Single Number | Easy |
| 137 | Single Number II | Medium |
| 169 | Majority Element | Easy |
| 187 | Repeated DNA Sequences | Medium |
| 201 | Bitwise AND of Numbers Range | Medium |
| 231 | Power of Two | Easy |
| 260 | Single Number III | Medium |
| 268 | Missing Number | Easy |
| 287 | Find the Duplicate Number | Medium |
| 318 | Maximum Product of Word Lengths | Medium |
| 338 | Counting Bits | Easy |
| 342 | Power of Four | Easy |
| 371 | Sum of Two Integers | Medium |
| 389 | Find the Difference | Easy |
| 393 | UTF-8 Validation | Medium |
| 397 | Integer Replacement | Medium |
| 401 | Binary Watch | Easy |
| 405 | Convert a Number to Hexadecimal | Easy |
| 421 | Maximum XOR of Two Numbers in an Array | Medium |
| 461 | Hamming Distance | Easy |
| 464 | Can I Win | Medium |
| 473 | Matchsticks to Square | Medium |
| 476 | Number Complement | Easy |
| 477 | Total Hamming Distance | Medium |
| 491 | Increasing Subsequences | Medium |
| 526 | Beautiful Arrangement | Medium |
| 638 | Shopping Offers | Medium |
| 645 | Set Mismatch | Easy |
| 672 | Bulb Switcher II | Medium |