LeetCode 263. Ugly Number && 264. Ugly Number II用java实现丑数的判定与查找

原题链接: https://leetcode.com/problems/ugly-number/ https://leetcode.com/problems/ugly-number-ii/ Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. 丑数的定义:一个数字只有2,3,5三个质因子。1也是丑数。
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