Solution for "sunloverz / gist:6309925" on c++

rectangularGrid.cpp

#include <stdio.h>

class RectangularGrid{
    public:
        long long countRectangles(int n, int m){
            long long sum=0;
            for(int i_n=1; i_n<=n; i_n++)
                for(int i_m=1; i_m<=m; i_m++)
                  if(i_m!=i_n)
                    sum+=(m-i_m+1)*(n-i_n+1);
            return sum;
        };
};

int main(){
   RectangularGrid* r = new RectangularGrid();
   printf("%lld",r->countRectangles(3,3));
   printf("%lld",r->countRectangles(2,5));
   printf("%lld",r->countRectangles(592,964));
};