Practice problems across 75+ categories
Practice problems frequently asked at Two Pointers • 223 problems | 57 Easy | 134 Medium | 31 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 211 | Trapping Rain Water | Hard | ArrayTwo PointersDynamic Programming |
| 212 | Two Sum BSTs | Medium | Two PointersBinary SearchStack |
| 213 | Two Sum II - Input Array Is Sorted | Medium | ArrayTwo PointersBinary Search |
| 214 | Two Sum III - Data structure design | Easy | ArrayHash TableTwo Pointers |
| 215 | Two Sum IV - Input is a BST | Unknown | Hash TableTwo PointersTree |
| 216 | Two Sum Less Than K | Easy | ArrayTwo PointersBinary Search |
| 217 | Valid Palindrome | Easy | Two PointersString |
| 218 | Valid Palindrome II | Easy | Two PointersStringGreedy |
| 219 | Valid Palindrome IV | Medium | Two PointersString |
| 220 | Valid Triangle Number | Medium | ArrayTwo PointersBinary Search |
| 221 | Valid Word Abbreviation | Easy | Two PointersString |
| 222 | Watering Plants II | Medium | ArrayTwo PointersSimulation |
| 223 | Ways to Split Array Into Three Subarrays | Medium | ArrayTwo PointersBinary Search |
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