SPOJ - TRICOUNT

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Problem Code : TRICOUNT

Problem      : Counting Triangles

Platform     : SPOJ

Language     : C 

Link         : SPOJ




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//submitted
//http://www.spoj.com/problems/TRICOUNT/

#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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