如果想开io优化，应该是

#include<bits/stdc++.h>
using namespace std;
int main()
{
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	ios::sync_with_stdio(0);
	cin.tie(0);

	return 0;
}

还是

#include<bits/stdc++.h>
using namespace std;
int main()
{
  	ios::sync_with_stdio(0);
	cin.tie(0);
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	

	return 0;
}