杭电ACM1094计算A+B的问题

/*时间：2012.03.14作者：烟大洋仔题目：Problem DescriptionYour task is to calculate the sum of some integers.InputInput contains multiple test cases, and one case one line. Each case starts with an integer N, and then N integers follow in the same line. OutputFor each test case you should output the sum of N integers in one line, and with one line of output for each line in input. Sample Input4 1 2 3 45 1 2 3 4 5 Sample Output1015题目分析：刚看到该题目的时候似乎是之前做过，很顺手的就写出来啦看来必要的练习还是有用的*/#include <iostream>using namespace std;int main(){    int n,a,sum=0;    while(cin>>n)    {        sum=0;        while (n--)        {            cin>>a;            sum=sum+a;        }    cout<<sum<<endl;    }    return 0;}