Problem Description
Your task is to calculate the sum of some integers.
 

Input
Input contains an integer N in the first line, and then N lines follow. 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
3
4 1 2 3 4
5 1 2 3 4 5
3 1 2 3
 

Sample Output
10

15

6
 

我的代码
#include"stdio.h"
main()
{
int n,m,sum=0,i,j,k,l=0;
 scanf("%d",&n);
 for(i=1;i<=n;i++)
   {
    sum=0;
     scanf("%d",&m);
     for(j=1;j<=m;j++)
     {
      scanf("%d",&k);
      sum+=k;
     }

      printf("%d\n\n",sum);
   }
}
问题就是如何让最后一行不输出空行

#include <stdio.h>
int main()
{
    int T,n,x,sum,f;
    scanf("%d",&T);
    f=0;
    while(T--)
    {
        if(f)
            printf("\n");
        scanf("%d",&n);
        sum=0;
        while(n--)
        {
            scanf("%d",&x);
            sum+=x;
        }
        printf("%d\n",sum);
        f=1;
    }
    return 0;
}