常用模板（感觉还不错）

#include<iostream>
#include<cstring>
#include<algorithm>
#include<cstdio>
#include<cmath>
#include<queue>
#include<vector>
#include<climits>
#include<string>
#include<cstdlib>
#include<set>
#include<stack>
#include<map>
#include<bitset>
#include<ctime>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
inline ll read()
{
    char k=0;char ls;ls=getchar();for(;ls<'0'||ls>'9';k=ls,ls=getchar());
    ll x=0;for(;ls>='0'&&ls<='9';ls=getchar())x=x*10+ls-'0';
    if(k=='-')x=0-x;return x;
}

int main()
{
    //freopen(".in","r",stdin);
    //freopen(".out","w",stdout);


    //fclose(stdin);
    //fclose(stdout);
    return 0;
}