[HackerEarth] Roger the Lion wants to help all his friends with passing exams. They need to solve the following problem to pass the IT exam. - 题解

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题目信息
题号 P15430
标题 [HackerEarth] Roger the Lion wants to help all his friends with passing exams. They need to solve the following problem to pass the IT exam.
难度 普及
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