Say no to Handshakes!!!

Given the fact that any two persons shake hand exactly once, Find the total count of handshakes that happened in that meeting.

Example:

Input:  n = 2
Output: 1

Approach

C++

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

int noHandshakes(int n)
{
    int res = n * (n - 1) / 2;
    return res;
}
int main()
{

    int n = 2;
    cout << noHandshakes(n);

    return 0;
}