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JOI 2016 Open Contest Skyscraper
Abridged Problem Statement : Given a1, a2, ..., an, find the number of permutations of these numbers such that |a1 - a2| + |a2 - a3| + ... + |an - 1 + an| ≤ L where L is a given integer.
The editorial given is very brief and the sample code is nearly unreadable. I have no idea how they do the dp.
Can anyone explain the solution? Thanks.
