Nice Prefixes

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Nice Prefixes Consider strings formed from characters from an alphabet of size K. For example, if K = 4, our alphabet might be {a,b,c,d}, and an example string is bbcac. For a string S, define count(S, k) to be the number of occurrences of the symbol k in S. For example, count(bbcac, b) = 2 and count(bbcac, a) = 1. A prefix of a string S is any string obtained from S by deleting some (possibly

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solution.cppC++17

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