ACM_Power Mouth

Power Mouth

Time Limit: 2000/1000ms (Java/Others)

Problem Description:

Your task is to calculate the sum of some integers.

Input:

The input contains several cases,each case contains an integer N in the first line, and then N lines follow(as a group). Each line starts with a integer M, 
and then M integers follow in the same line.

Output:

For each group of input integers you should output their sum in one line, and you must note that there is a blank line between outputs.

Sample Input:

It is easy.

Sample Output:

It is simple.
解题思路：题目很简单，输出之间要有一空行，累加m个数并输出即可。
AC代码：

#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
LL sum,n,m,x;bool flag;
int main(){
    while(cin>>n){
        flag=false;
        while(n--){
            cin>>m;sum=0;
            if(flag)cout<<endl;//输出之间留一空行，第一次不输出，以后每次都输出空行
            while(m--){cin>>x;sum+=x;}
            cout<<sum<<endl;
            flag=true;
        }
    }
    return 0;
}