Triangular Sums

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 sum(int n);

int main(){
    int T;
    int n;
    int i;
    int result;
    int time;
    
    time=1;
    
    scanf("%d",&T);
    
    while(T--){
        scanf("%d",&n);
        
        result=0;
        for(i=1;i<=n;i++)
            result+=i*sum(i+1);
        
        printf("%d %d %d\n",time,n,result);    
        time++;
    }
        
    return 0;
}

int sum(int n){
    int i;
    int result;
    
    result=0;
    for(i=1;i<=n;i++)
        result+=i;
        
    return result;
}