十年 OI 一场空，不开 O2 见祖宗

#pragma GCC optimize(2)

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C++ Head File

#include<iostream>
#include<fstream>
#include<vector>
#include<string>
#include<cmath>
#include<bits/stdc++.h>
#include<algorithm>
#include<ctime>
#include<cstdlib>
#include<cassert>
#include<cstddef>
#include<cstdio>
#include<cstring>
#include<ctime>
#include<cctype>
#include<iomanip>
#include<cmath>
#include<cstdlib>
#include<stdexcept>
#include<fstream>
#include<stack>
#include<sstream>
#include<queue>
using namespace std;
int main() {

    return 0;
}

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