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题目描述 A positive integer is called a "prime-factor prime" when the number of its prime factors is prime. For example, 12 is a prime-factor prime becaus 阅读全文
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题目链接:http://icpc.upc.edu.cn/problem.php?cid=1828&pid=7 题目描述 Now you have a string consists of uppercase letters, two integers A and B. We call a subst 阅读全文
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题目描述 God Water likes to eat meat, fish and chocolate very much, but unfortunately, the doctor tells him that some sequence of eating will make them po 阅读全文