CSU-ACM暑假集训基础组训练赛(1) A - Problem A

本来是水题，但作为周赛的题目，还是写一下吧。

Description

Wangpeng is good at drawing. Now he wants to say numbers like “521” to his girlfriend through the game draw something. 
Wangpeng can’t write the digit directly. So he comes up a way that drawing several squares and the total area of squares is the number he wants to say. 
Input all the square Wangpeng draws, what’s the number in the picture?

 

Input

There are multiple test cases. 
For each case, the first line contains one integer N(1≤N≤100) indicating the number of squares. 
Second line contains N integers ai(1≤ai≤100)represent the side length of each square. No squares will overlap. 
Input ends with N = 0.

 

Output

For each case, output the total area in one line.

 

Sample Input

 4
1 2 3 4
3
3 3 3
0 

 

Sample Output

 30
27 

 

以下是代码：

#include <iostream>
#include<cstdio>
using namespace std;
#define maxn 100+10
long long a[maxn]={0};
int main()
{
    int n,i,j,k;
    cin>>n;
    while(n!=0)
    {
        long long s=0;
        for(i=0;i<n;i++)
        {
            cin>>a[i];
            s+=a[i]*a[i];
        }
        cout<<s<<endl;
        cin>>n;
    }
    return 0;
}

含义自明，就不解释了。用时八分钟，有点慢。