我与 freopen 不共戴天！！！！！！！！！
\Huge\color{blue}\bf{freopen}
\huge\color{green}\textbf{我与你不共戴天}
\Huge\color{red}\bf{!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!}
\Huge\color{purple}\textbf{啊啊啊啊啊啊啊啊啊啊}
下面列举示例和缘由：
2022.10，CSP-J2 赛场上
freopen("pow.out","W",stdout);
2023.2，洛谷比赛中
freopen 函数没删
2023.10 CSP-J2 赛场上
freopen("apple,in","r",stdin);