Can anyone help me solve this hackerrank problem?

Правка en3, от cronenberg, 2017-07-24 20:21:15

this problem was asked in the last week of code of hackerrank, I am having a hard time understanding the editorial can anyone help me with it?

Теги #hackerrank, #dp

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en3 Английский cronenberg 2017-07-24 20:21:15 0 (published)
en2 Английский cronenberg 2017-07-24 20:21:01 22 (saved to drafts)
en1 Английский cronenberg 2017-07-24 17:16:23 270 Initial revision (published)