个人常用初始模板

#include<bits/stdc++.h>
#define ll long long
#define N 100005
#define endl "\n"
#define FAST ios_base::sync_with_stdio(false);cin.tie(0);
using namespace std;

ll read() {
	ll f  =  1, x  =  0;
	char  s  =  getchar();
	while (s  <  '0'  ||  s  >  '9') {
		if (s  ==  '-')f  =  -1;
		s  =  getchar();
	}
	while (s  >=  '0'  &&  s  <=  '9') {
		x  =  x  *  10  +  s  -  '0';
		s  =  getchar();
	}
	x  *=  f;
	return  x;
}

int main(){
	freopen("A.out", "w", stdout);
	
	return 0;
}