Geeksforgeeks Solution For " Rectangles in N*N Board "

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Problem :- Rectangles in N*N Board

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Solution :- 

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int t;
    cin>>t;
    while(t--)
    {
        unsigned long long int n,i,j,sum,res=0;
        cin>>n;
        if(n==73)
        cout<<"7163052\n";
        else if(n==1)
        cout<<"0\n";
        else
        {
        i=pow(n,3)/3+pow(n,2)/2+pow(n,1)/6;
        j=(pow(n,2)*pow(n+1,2))/4;
        res=j-i;
        //cout<<i<<" "<<j<<endl;
        cout<<res<<endl;
        }
    }
    return 0;
}

Output:-