[HackerEarth] Prof. Lambda has N students in his class. Due to his ignorance his students has gone rogue on him and never comes to class on time. Prof. Lambda has decided to discipline them by canceli - 题解

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题目信息
题号 P17858
标题 [HackerEarth] Prof. Lambda has N students in his class. Due to his ignorance his students has gone rogue on him and never comes to class on time. Prof. Lambda has decided to discipline them by canceli
难度 普及-
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