CF594E Cutting the Line

You are given a non-empty line $ s $ and an integer $ k $ . The following operation is performed with this line exactly once: - A line is split into at most $ k $ non-empty substrings, i.e. string $ s $ is represented as a concatenation of a set of strings $ s=t_{1}+t_{2}+...+t_{m} $ , $ 1

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