| 5 | Longest Palindromic Substring | — | Medium | Two PointersStringDynamic Programming | 36% | |
| 11 | Container With Most Water | — | Medium | ArrayTwo PointersGreedy | 58% | |
| 15 | 3Sum | — | Medium | ArrayTwo PointersSorting | 37% | |
| 16 | 3Sum Closest | — | Medium | ArrayTwo PointersSorting | 47% | |
| 18 | 4Sum | — | Medium | ArrayTwo PointersSorting | 38% | |
| 19 | Remove Nth Node From End of List | — | Medium | Linked ListTwo Pointers | 49% | |
| 26 | Remove Duplicates from Sorted Array | — | Easy | ArrayTwo Pointers | 60% | |
| 27 | Remove Element | — | Easy | ArrayTwo Pointers | 60% | |
| 28 | Find the Index of the First Occurrence in a String | — | Easy | Two PointersStringString Matching | 45% | |
| 31 | Next Permutation | — | Medium | ArrayTwo Pointers | 43% | |
| 42 | Trapping Rain Water | — | Hard | ArrayTwo PointersDynamic Programming | 65% | |
| 61 | Rotate List | — | Medium | Linked ListTwo Pointers | 40% | |
| 75 | Sort Colors | — | Medium | ArrayTwo PointersSorting | 67% | |
| 80 | Remove Duplicates from Sorted Array II | — | Medium | ArrayTwo Pointers | 63% | |
| 82 | Remove Duplicates from Sorted List II | — | Medium | Linked ListTwo Pointers | 50% | |
| 86 | Partition List | — | Medium | Linked ListTwo Pointers | 59% | |
| 88 | Merge Sorted Array | — | Easy | ArrayTwo PointersSorting | 53% | |
| 125 | Valid Palindrome | — | Easy | Two PointersString | 51% | |
| 141 | Linked List Cycle | — | Easy | Hash TableLinked ListTwo Pointers | 52% | |
| 142 | Linked List Cycle II | — | Medium | Hash TableLinked ListTwo Pointers | 55% | |
| 143 | Reorder List | — | Medium | Linked ListTwo PointersStack | 62% | |
| 148 | Sort List | — | Medium | Linked ListTwo PointersDivide and Conquer | 61% | |
| 151 | Reverse Words in a String | — | Medium | Two PointersString | 51% | |
| 160 | Intersection of Two Linked Lists | — | Easy | Hash TableLinked ListTwo Pointers | 61% | |
| 165 | Compare Version Numbers | — | Medium | Two PointersString | 42% | |
| 167 | Two Sum II - Input Array Is Sorted | — | Medium | ArrayTwo PointersBinary Search | 63% | |
| 189 | Rotate Array | — | Medium | ArrayMathTwo Pointers | 43% | |
| 202 | Happy Number | — | Easy | Hash TableMathTwo Pointers | 58% | |
| 234 | Palindrome Linked List | — | Easy | Linked ListTwo PointersStack | 56% | |
| 253 | Meeting Rooms II | — | Medium | ArrayTwo PointersGreedy | 52% | |
| 283 | Move Zeroes | — | Easy | ArrayTwo Pointers | 63% | |
| 287 | Find the Duplicate Number | — | Medium | ArrayTwo PointersBinary Search | 63% | |
| 295 | Find Median from Data Stream | — | Hard | Two PointersDesignSorting | 53% | |
| 321 | Create Maximum Number | — | Hard | ArrayTwo PointersStack | 32% | |
| 344 | Reverse String | — | Easy | Two PointersString | 80% | |
| 345 | Reverse Vowels of a String | — | Easy | Two PointersString | 58% | |
| 349 | Intersection of Two Arrays | — | Easy | ArrayHash TableTwo Pointers | 76% | |
| 350 | Intersection of Two Arrays II | — | Easy | ArrayHash TableTwo Pointers | 59% | |
| 392 | Is Subsequence | — | Easy | Two PointersStringDynamic Programming | 48% | |
| 443 | String Compression | — | Medium | Two PointersString | 58% | |
| 455 | Assign Cookies | — | Easy | ArrayTwo PointersGreedy | 54% | |
| 457 | Circular Array Loop | — | Medium | ArrayHash TableTwo Pointers | 35% | |
| 475 | Heaters | — | Medium | ArrayTwo PointersBinary Search | 40% | |
| 481 | Magical String | — | Medium | Two PointersString | 52% | |
| 522 | Longest Uncommon Subsequence II | — | Medium | ArrayHash TableTwo Pointers | 43% | |
| 524 | Longest Word in Dictionary through Deleting | — | Medium | ArrayTwo PointersString | 52% | |
| 532 | K-diff Pairs in an Array | — | Medium | ArrayHash TableTwo Pointers | 45% | |
| 541 | Reverse String II | — | Easy | Two PointersString | 52% | |
| 556 | Next Greater Element III | — | Medium | MathTwo PointersString | 35% | |
| 557 | Reverse Words in a String III | — | Easy | Two PointersString | 84% | |