Geeksforgeeks Solution For " Squares in N*N Chessboard " In C

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Problem :- Squares in N*N Chessboard

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Solution :- 

#include<stdio.h>
int main()
{
    int t;
    scanf("%d",&t);
        while(t--)
{
            int n;
            unsigned long long s;
            scanf("%d",&n);
            s = (n * (n + 1) / 2) * (2*n + 1) / 3;
            printf("%llu",s);
            
         printf("\n");
}
    return 0;
}

Output:-