LeetCode 263. Ugly Number && 264. Ugly Number II用java實現醜數的判定與查找

原題鏈接： 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. 醜數的定義：一個數字只有2，3，5三個質因子。1也是醜數。

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