> For the complete documentation index, see [llms.txt](https://liuzhenglaichn.gitbook.io/algorithm/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://liuzhenglaichn.gitbook.io/algorithm/data-structure/stack.md).

# Stack

## Problems

* [84. Largest Rectangle in Histogram (Hard)](https://leetcode.com/problems/largest-rectangle-in-histogram/)
* [901. Online Stock Span (Medium)](https://leetcode.com/problems/online-stock-span/)