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2024-05-22
CF Round946 (Div. 3)B:如何写映射
SymmetricEncoding题目描述Polycarphasastring$s$,whichconsistsoflowercaseLatinletters.Heencodesthisstringusingthefollowingalgorithm:first,heconstructsanewauxiliarystring$r$,whichconsistsofalldistinctlettersofthestrin