HDU 1093 A+B for Input-Output Practice (V)

#include <stdio.h>
int  main()
{
    int a, sum, n, i, m;
    while (~scanf ("%d", &n)&&n)
    {
        while(n--)
        {
            scanf("%d", &m);
            sum = 0;
            for(i=1;i<=m;i++)
            {
            scanf("%d", &a);
            sum += a;
            }
            printf ("%d\n", sum);
        }
    }
    return 0;
}