| 3 | Longest Substring Without Repeating Characters | Medium |
| 11 | Container With Most Water | Medium |
| 15 | 3Sum | Medium |
| 16 | 3Sum Closest | Medium |
| 18 | 4Sum | Medium |
| 19 | Remove Nth Node From End of List | Medium |
| 26 | Remove Duplicates from Sorted Array | Easy |
| 27 | Remove Element | Easy |
| 28 | Implement strStr() | Easy |
| 30 | Substring with Concatenation of All Words | Hard |
| 42 | Trapping Rain Water | Hard |
| 61 | Rotate List | Medium |
| 75 | Sort Colors | Medium |
| 76 | Minimum Window Substring | Hard |
| 80 | Remove Duplicates from Sorted Array II | Medium |
| 86 | Partition List | Medium |
| 88 | Merge Sorted Array | Easy |
| 125 | Valid Palindrome | Easy |
| 141 | Linked List Cycle | Easy |
| 142 | Linked List Cycle II | Medium |
| 167 | Two Sum II - Input array is sorted | Easy |
| 234 | Palindrome Linked List | Easy |
| 283 | Move Zeroes | Easy |
| 287 | Find the Duplicate Number | Medium |
| 295 | Find Median from Data Stream | Hard |
| 350 | Intersection of Two Arrays II | Easy |
| 392 | Is Subsequence | Easy |
| 455 | Assign Cookies | Easy |
| 556 | Next Greater Element III | Medium |
| 844 | Backspace String Compare | Easy |