solution of TRICOUNT - Counting Triangles on spoj

TRICOUNT - Counting Triangles

solution-

#include<stdio.h>

int main()

{

int t;

scanf("%d",&t);

while(t--)

{

long long unsigned num,sum;

scanf("%llu",&num);

if(num%2==0)

sum=(num*(num+2)*((2*num)+1))/8;

else

sum=((num*(num+2)*((2*num)+1))-1)/8;

printf("%llu\n",sum);

}

return 0;

}

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