C++ contest template

#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using pii = pair<int, int>;

#define     endl               "\n"
#define     fast_io            ios::sync_with_stdio(false); cin.tie(0);
#define     file_io            freopen("input.txt", "r", stdin);   \
                               freopen("output.txt", "w", stdout);
#define     _unique(c)         (c).resize(unique(begin(c), end(c)) - (c).begin());
#define     debug(x)           cerr <<"Line "<< __LINE__ <<" : "<< #x " = "<< x <<endl;

template<typename T, typename TT>
ostream& operator<<(ostream &os, const pair<T, TT> &t) { return os<<"("<<t.first<<", "<<t.second<<")"; }
template<typename T>
ostream& operator<<(ostream& os, const vector<T> &t) { for(auto& i: t) os<<i<<" "; return os; }






int main(int argc, char** argv) {
    fast_io
#ifdef LOCAL
    file_io
#endif




    return 0;
}