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Questions about problems that can be solved by combining recursively obtained solutions of subproblems.

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Given two strings $S_1, S_2$, we write $S_1S_2$ for their concatenation. Given a string $S$ and integer $k\geq 1$, we write $(S)^k = SS\cdots S$ for the concatenation of $k$ copies of $S$. Now given a …
asked Dec 11 '18 by Timon Knigge