1 /*
2 HDU5924 Mr. Frog’s Problem
3 http://acm.hdu.edu.cn/showproblem.php?pid=5924
4 数论
5 *
6 */
7 #include <cstdio>
8 int main()
9 {
10 long long a,b;
11 int t;
12 scanf("%d",&t);
13 for(int k=1;k<=t;k++)
14 {
15 scanf("%lld%lld",&a,&b);
16 printf("Case #%d:\n",k);
17 if(a==b)
18 {
19 printf("1\n");
20 printf("%lld %lld\n",a,b);
21 }
22 else
23 {
24 printf("2\n");
25 if(a<b)
26 {
27 printf("%lld %lld\n",a,b);
28 printf("%lld %lld\n",b,a);
29 }
30 else
31 {
32 printf("%lld %lld\n%lld %lld\n",b,a,a,b);
33 }
34 }
35
36 }
37 return 0;
38 }
