Вот эта задача http://codeforces.net/problemset/gymProblem/101529/B
Я глянул решение жюри, там было трехмерное дп, но мне не понятно, что там делается. Может кто то объяснить?
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Codeforces Round 977 (Div. 2, based on COMPFEST 16 - Final Round)
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