| 258 | Add Digits | Easy |
| 263 | Ugly Number | Easy |
| 268 | Missing Number | Easy |
| 283 | Move Zeroes | Easy |
| 290 | Word Pattern | Easy |
| 292 | Nim Game | Easy |
| 303 | Range Sum Query - Immutable | Easy |
| 338 | Counting Bits | Easy |
| 342 | Power of Four | Easy |
| 383 | Ransom Note | Easy |
| 387 | First Unique Character in a String | Easy |
| 389 | Find the Difference | Easy |
| 392 | Is Subsequence | Easy |
| 401 | Binary Watch | Easy |
| 415 | Add Strings | Easy |
| 455 | Assign Cookies | Easy |
| 459 | Repeated Substring Pattern | Easy |
| 496 | Next Greater Element I | Easy |
| 501 | Find Mode in Binary Search Tree | Easy |
| 543 | Diameter of Binary Tree | Easy |
| 557 | Reverse Words in a String III | Easy |
| 566 | Reshape the Matrix | Easy |
| 606 | Construct String from Binary Tree | Easy |
| 617 | Merge Two Binary Trees | Easy |
| 645 | Set Mismatch | Easy |
| 661 | Image Smoother | Easy |
| 669 | Trim a Binary Search Tree | Easy |
| 697 | Degree of an Array | Easy |
| 704 | Binary Search | Easy |
| 706 | Design HashMap | Easy |