| 226 | Invert Binary Tree | Easy |
| 228 | Summary Ranges | Easy |
| 231 | Power of Two | Easy |
| 232 | Implement Queue using Stacks | Easy |
| 234 | Palindrome Linked List | Easy |
| 235 | Lowest Common Ancestor of a Binary Search Tree | Easy |
| 237 | Delete Node in a Linked List | Easy |
| 242 | Valid Anagram | Easy |
| 257 | Binary Tree Paths | Easy |
| 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 |
| 326 | Power of Three | Easy |
| 338 | Counting Bits | Easy |
| 342 | Power of Four | Easy |
| 344 | Reverse String | Easy |
| 345 | Reverse Vowels of a String | Easy |
| 349 | Intersection of Two Arrays | Easy |
| 350 | Intersection of Two Arrays II | Easy |
| 367 | Valid Perfect Square | Easy |
| 374 | Guess Number Higher or Lower | 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 |