My AC solution gets wrong answer on this test:

26
3 2 10 11
3 1 3 12
3 2 4 5
3 3 6 7
3 3 8 9
3 4 13 14
3 4 15 16
3 5 17 18
3 5 19 20
3 1 21 22
3 1 23 24
3 2 25 26
1 6
1 6
1 7
1 7
1 8
1 8
1 9
1 9
1 10
1 10
1 11
1 11
1 12
1 12

I think it should be added to testset.

Your test was added. Thank you.