485-A*B Problem-nyoj20140808

#include <stdio.h>
int main()
{
    int T;
    scanf("%d",&T);
    while(T--)
    {
        int sum;
        long long a,b;
        scanf("%lld %lld",&a,&b);
        if(a==0||b==0)
        {
            sum=0;
            }
            else
            {
                sum=(a%9)*(b%9)%9;
                if(sum==0)
                sum=9;
                }
                printf("%d\n",sum);
        }
        return 0;
    }