freopen的各种错误姿势

本弱鸡已经触发的错误姿势：

freoprn("railway.in","r",stdin);

freopen("railway.cpp","r",stdin);

freopen("railway.out","W",stdout);

freopen("railway.in","r",stdout);

freopen("railway.our","w",stdout);//石队长触发的

freopen("railway,out","w",stdout);

freopen("edd.out","w",stdout);//本来叫egg

//freopen("egg.out","w",stdout);