NYOJ-122-Triangular Sums-2013年10月5日15:55:52

Triangular Sums

时间限制： 3000 ms  |  内存限制： 65535 KB

难度： 2

描述

The n^th Triangular number, T(n) = 1 + … + n, is the sum of the first n integers. It is the number of points in a triangular array with n points on side. For example T(4):

X
X X
X X X
X X X X

Write a program to compute the weighted sum of triangular numbers:

W(n) = SUM[k = 1…n; k * T(k + 1)]

输入

The first line of input contains a single integer N, (1 ≤ N ≤ 1000) which is the number of datasets that follow.

Each dataset consists of a single line of input containing a single integer n, (1 ≤ n ≤300), which is the number of points on a side of the triangle.

输出

For each dataset, output on a single line the dataset number (1 through N), a blank, the value of n for the dataset, a blank, and the weighted sum ,W(n), of triangular numbers for n.

样例输入

4
3
4
5
10

样例输出

1 3 45
2 4 105
3 5 210
4 10 2145

 
# include<stdio.h>



int main()
{
	int N,n,i,T,W,k;
	scanf("%d",&N);
	k = 0;
	while(N--)
	{
		k++;
		scanf("%d",&n);
		W = 0;
		for(i=1;i<=n;i++)
		{
			T = (i+2) * (i+1) / 2;
			W = i * T + W;
		}
		printf("%d %d %d\n",k,n,W);
	}

	return 0;
}