Can someone explain the dp behind this problem in detail with example please ?

Правка en1, от chari407, 2017-05-26 21:19:11

DP doesnt go into my head. I find it difficult to understand always. Any help on this problem would be very much appreciated. Thank you. Boredom

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en1 Английский chari407 2017-05-26 21:19:11 274 Initial revision (published)