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Sorry. I have found the error. My program fails when the number of links is 0. For example, inputs like 5 0.

Thanks anyway.

Hi, noob's passing by. I tried this problem but I got a WA during 0.000 seconds. I have checked my program with the input above, and I find them logically correct. I do not know what's wrong, so I hope you guys can give me any hints on what I have done wrong.

Btw, I'm using a basic algorithm of in ...

Hi..

I thought I have solved this problem (135) but it returned with a Wrong Answers. I'm not sure what's wrong with it, so I hope someone here can give me a helping hand.

The following is some of the output: -

1
1

2
1 2
1 3
2 3

3
1 2 3
1 4 5
1 6 7
2 4 7
2 5 6
3 4 6
3 5 7

4
1 2 3 4
1 5 6 7
1 ...