摘要：
题目 Volodya is an odd boy and his taste is strange as well. It seems to him that a positive integer number is beautiful if and only if it is divisible 阅读全文
摘要：
题目 本题中，我们将用符号 \(\lfloor c \rfloor\) 表示对 \(c\) 向下取整，例如：\(\lfloor 3.0 \rfloor = \lfloor 3.1 \rfloor = \lfloor 3.9 \rfloor = 3\)。 蛐蛐国最近蚯蚓成灾了！隔壁跳蚤国的跳蚤也拿蚯蚓 阅读全文