kphmd's blog

Tips for cf #176 Div 2 C. Lucky Permutation
By kphmd, 11 years ago, In English

eg. 5

1 -> ? -> 5
2 -> ? -> 4
3 -> ? -> 3
4 -> ? -> 2
5 -> ? -> 1

Case1:

1 -> ? -> 5 -> ? -> 1 2 -> ? -> 4 -> ? -> 2

merge above

1 -> 2 -> 5 -> 4 -> 1

Case2:

3 -> 3 -> 3

  • Vote: I like it
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  • Vote: I do not like it