快读

快读模板

#include<iostream>
#include<cstdlib>
#include<cstring>
#include<string>
#include<cstdio>
#include<cmath>
#include<algorithm>
#include<set>
#include<queue>
#include<vector>
#include<bitset>
#include<map>
#include<utility>
using namespace std;
int r_r(){
  int x=0,f=1;
  char c=getchar();
  while(!isdigit(c)){
    if(c=='-')f=-1;
    c=getchar();
  }
  while(isdigit(c)){
    x=(x<<1)+(x<<3)+(c^48);
    c=getchar();
  }
  return x*f;
}