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=;

             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 ;

 }