頭文件

#include<iostream>
#include<stdio.h>
#include<iomanip>
#include<queue>
#include<algorithm>
#include<cstring>
#include<map>
#include<cmath>
#define mem(a,x) memset(a,x,sizeof(a));
using namespace std;
int gcd(int a, int b) { return b == 0 ? a : gcd(b, a%b); }
int lcm(int a, int b) { return a * b / gcd(a, b); }
const int INF = 0x3f3f3f3f;
typedef long long ll;
typedef pair<int, int>P;
map<int,int>mp;
map<int, char *>mp1;
map<char *, int>mp2;
map<char, char>mp3;
const int maxn = 100010;