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。
AC代码：

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 typedef long long LL;
 4 LL sum,n,m,x;bool flag;
 5 int main(){
 6     while(cin>>n){
 7         flag=false;
 8         while(n--){
 9             cin>>m;sum=0;
10             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
11             while(m--){cin>>x;sum+=x;}
12             cout<<sum<<endl;
13             flag=true;
14         }
15     }
16     return 0;
17 }