Help on a Combinatorics Problem

Revision en1, by loser21, 2015-12-15 19:51:00

I have been trying the question , Just Some Permutations , for quite some time and I am unable to make real progress. I guess we need to apply Principle of Inclusion Exclusion somehow but I am unable to understand exactly how. The question appeared in the 2014 ACM ICPC Dhaka Regionals. Any help on how to solve it will be great.

Tags combinatorics, pie, dhaka regional


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en1 English loser21 2015-12-15 19:51:00 482 Initial revision (published)