Simple C++ Competitive Programming Template

I have been searching for a standard redundant piece of code that I have to write in each of my C++ programs. While searching I found many, some of them were really good but they had many unnecessary template classes and too many functions which I thought were not of use much.

So after going through them all I created a template for myself. And I am sharing this hoping it would be beneficial to others :

#include <bits/stdc++.h>
using namespace std;
#define read(type) readInt<type>() // Fast read
#define ll long long
#define nL "\n"
#define pb push_back
#define mk make_pair
#define pii pair<int, int>
#define a first
#define b second
#define vi vector<int>
#define all(x) (x).begin(), (x).end()
#define umap unordered_map
#define uset unordered_set
#define MOD 1000000007
#define imax INT_MAX
#define imin INT_MIN
#define exp 1e9
#define sz(x) (int((x).size()))
int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int ttt; cin >> ttt;
    while(ttt--) {
    }
    return 0;
}

The code will run for the given sample test cases

I have used ‘ int32_t main() ’ instead of ‘ int main() ’ as if you have written the program for using “ int ” variables but later on you realize you have to increase the range with ‘long long’.

So intead of,
#define ll long long
use : 
#define int long long

This would save you the time to change each and every int variables, but there is no ‘ long long ’ main function so it is better to just change it to

int32_t main()
instead of : int main()

I have used ‘ios_base::sync_with_stdio(false);’ this snippet to increase the execution speed of cin and cout. I have explained the same in this blog

Don’t Use cin and cout in C++

All the rest #define are just abbreviations of the most used functions in any program.