为什么我的电脑上没问题,但学校机房会出错，搭配ios::sync...该放哪

signed main()
{
	freopen("1.in","r",stdin);
	freopen("1.out","w",stdout);
	ios::sync_with_stdio(0);cin.tie(0),cout.tie(0);
	
	return 0;
}