OJ Board

Hi everyone,
I'm trying to understand this problem, but i don't have in mind the reason of the correct output for some test cases, for example:

1
77 123
30 52
93 96
89 32
89 70
71 55
40 79
64 10
30 80
62 19
98 67
8 42
57 32
22 27
38 1
52 89
43 74
2 8
82 65
67 20
43 22
95 22
48 16
6 25
86 75
3 96 ...