头文件及宏定义

/*
                                                  
  _|_|                              _|  _|    _|  
_|    _|  _|  _|_|  _|_|_|_|        _|  _|  _|    
_|    _|  _|_|          _|          _|  _|_|      
_|    _|  _|          _|      _|    _|  _|  _|    
  _|_|    _|        _|_|_|_|    _|_|    _|    _|  
                                                                                                    
*/ 
#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<cstring>
#include<vector>
#include<queue>
#include<set>
//#define ls (rt<<1)
//#define rs (rt<<1|1)
#define vi vector<int>
#define pb push_back
#define mk make_pair
#define pii pair<int,int>
#define rep(i,a,b) for(int i=(a),i##end=(b);i<=i##end;i++)
#define fi first
#define se second
typedef long long ll;
using namespace std;