Stuck in a problem

Revision en2, by skpro19, 2017-09-01 03:10:05

I am getting a WA on test 9 on this DIV 1A.

Is there a problem with my 'poss' function or the very dfs function itself?

This is my submission.

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en2 English skpro19 2017-09-01 03:10:05 76
en1 English skpro19 2017-09-01 00:43:55 217 Initial revision (published)