#pragma GCC optimize("O0")
#include <iostream>
#include <bits/stdc++.h>
using namespace std;

#define int long long
#define endl "\n"
#define optimise() ios_base::sync_with_stdio(true); cin.tie(0); cout.tie(0);
#define debug (x) cout << "debugged variable:" << x << endl;
#define map unordered_map
#define set unordered_set

int32_t main() {
    return 1;
}

Explanation of template:

• #pragma GCC optimize("O0") means using fast compiler options to optimize
• #define int long long — uses long long by default instead of int, prevents overflows
• #define optimise() optimises reading input/output
• #define debug (x) is a debug function, use it like this: debug(my_variable).
• #define map/set — uses more efficient unordered hashtable (insert/delete operation in $$$O(1)$$$) instead of regular search tree (which is $$$O(\log n)$$$).