template.cpp

#include<bits/stdc++.h>
#define ll long long 
#define mp make_pair
#define pb push_back
#define ppb pop_back
#define ff first
#define ss second
#define vi vector<int>
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
using namespace std;

#ifndef ONLINE_JUDGE
#define debug(x) cerr << #x << " "; _pr(x); cerr << endl;
#else
#define debug(x);
#endif

void _pr(int t) {cerr << t;}
void _pr(ll t) {cerr << t;}
void _pr(string t) {cerr << t;}
void _pr(char t) {cerr << t;}
void _pr(double t) {cerr << t;}

template<class T>void _pr(vector<T> t){cerr<<'[';for(T x:t){_pr(x);cerr<<',';}cerr<<']';}
template<class T>void _pr(set<T> t){cerr<<'{';for(T x:t){_pr(x);cerr<<',';}cerr<<'}';}

int main(){

    #ifndef ONLINE_JUDGE
        freopen("error.txt","w",stderr);
    #endif

    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    return 0;
}