HDU5924 Mr. Frog’s Problem

/*
 HDU5924 Mr. Frog’s Problem
 http://acm.hdu.edu.cn/showproblem.php?pid=5924
 数论
 *
 */
#include <cstdio>
int main()
{
    long long a,b;
    int t;
    scanf("%d",&t);
    for(int k=1;k<=t;k++)
    {
        scanf("%lld%lld",&a,&b);
        printf("Case #%d:
",k);
        if(a==b)
        {
            printf("1
");
            printf("%lld %lld
",a,b);
        }
        else
        {
            printf("2
");
            if(a<b)
            {
                printf("%lld %lld
",a,b);
                printf("%lld %lld
",b,a);
            }
            else
            {
                printf("%lld %lld
%lld %lld
",b,a,a,b);
            }
        }

    }
    return 0;
}