/C++/Nearly similar rectangles hackerrank solution

Nearly similar rectangles hackerrank solution

#include<bits/stdc++.h>
#define ll long long
using namespace std;
ll combinations(ll n)
{
	ll count=1;
	if(n<2)
	return 0;	
	else
	{
	   for(ll i=1;i<=2;i++)
		{
			count=count*n--;
			count=count/i;
		}
	}
	return count;
}

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