[AtCoder] You are given a string S of length N consisting of A, B and C, and an integer K which is between 1 and N (inclusive). - 题解

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题目信息
题号 P15854
标题 [AtCoder] You are given a string S of length N consisting of A, B and C, and an integer K which is between 1 and N (inclusive).
难度 普及-
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