> 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/io-optimization.md).

# Io Optimization

By prepending the following code, the execution time of problems with large input will be improved a lot.

```cpp
// The following block might trivially improve the exec time.
static const auto __optimize__ = []() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(NULL);
    return 0;
}();
```