Hanit and playtime

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A string is called a "prime string" if it can't be written as concatenation of more than one same strings. For example, the following strings are not prime strings: AAA, ABABAB, CFGFGCFGFG, while CFGFGC, ABABA are prime strings. Hanit's mom is a school teacher, she promises to give him 1min of extra computer time for every prime string he finds of length $n$ and containing only first $k$ letters

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solution.cppC++17

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