Contents

#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <ctime>
#include <cmath>
#include <iostream>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <list>
#include <string>
#include <sstream>
using namespace std;

#define Lson(x) (x<<1)   // 注意这里的括号(x << 1)
#define Rson(x) (Lson(x)|1) //注意括号要有
#define Mid(x,y) ((x+y)>>1)//注意括号要有

#define _PI acos(-1.0)
#define esp 1e-9
#define INF 0x3f3f3f3f

#define MAXN 
#defube N 

int main(){


	return 0;
}