> For the complete documentation index, see [llms.txt](https://doc.macrohard.cn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.macrohard.cn/templates/io/runtime.md).

# 运行时间

```cpp
clock_t start, end;
start = clock();
// TODO
end = clock();
cout << double(end - start) / CLOCKS_PER_SEC << "s" << endl;
```