此贴结，编译信息
```cpp
/tmp/compiler_99ym5o7o/src:9:51: 警告：comparison of integer expressions of different signedness: ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} and ‘int’ [-Wsign-compare]
```
by Limitless_lmw @ 2023-01-14 22:13:53