1、#include <experimental/filesystem>
旧版本文件，将产生错误：
#error The <experimental/filesystem> header providing std::experimental::filesystem is deprecated by Microsoft \
and will be REMOVED. It is superseded by the C++17 <filesystem> header providing std::filesystem. \
You can define _SILENCE_EXPERIMENTAL_FILESYSTEM_DEPRECATION_WARNING to acknowledge that you have received this warning.
2、#include <filesystem>
修改后成功运行。
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原文链接：https://blog.csdn.net/HUANG_XIAOJUN/article/details/103208551