> For the complete documentation index, see [llms.txt](https://programming.arora-aditya.com/leetcode/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://programming.arora-aditya.com/leetcode/two-pointer.md).

# Two pointer

- [42. Trapping Rain Water](https://programming.arora-aditya.com/leetcode/two-pointer/42.-trapping-rain-water.md)