[AtCoder] We have N colored balls arranged in a row from left to right; the color of the i-th ball from the left is c_i. - 题解

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题目信息
题号 P20459
标题 [AtCoder] We have N colored balls arranged in a row from left to right; the color of the i-th ball from the left is c_i.
难度 提高-
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