https://blog.wongcw.com/2020/04/26/%e8%bf%91%e6%9c%9freopen%e7%be%8e%e5%9c%8b%e5%b7%9e-%e5%9f%8e%e5%b8%82%e5%9f%9f%e5%90%8d%e8%a2%ab%e5%a4%a7%e9%87%8f%e8%a8%bb%e5%86%8a%e8%aa%b0%e6%98%af%e5%b9%95%e5%be%8c%e6%8e%a8/