[AtCoder] We have A cards, each of which has an integer 1 written on it. Similarly, we also have B cards with 0s and C cards with -1s. - 题解

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题目信息
题号 P19493
标题 [AtCoder] We have A cards, each of which has an integer 1 written on it. Similarly, we also have B cards with 0s and C cards with -1s.
难度 普及-
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