快读及关闭输入输出流

inline void read(int &x)
{
	char ch=getchar();int f=1;x=0;
	while(!isdigit(ch) && ch^'-') ch=getchar();
	if(ch=='-') f=-1,ch=getchar();
	while(isdigit(ch)) x=x*10+ch-'0',ch=getchar();
	x*=f;
}

ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);