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solutions/264. Ugly Number II.md
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# [264. Ugly Number II](https://leetcode.com/problems/ugly-number-ii/)
# 思路
要求第n个ugly数. 由于ugly集合相对于整个int集合是很小的, 所以此题用蛮力法不断判断某个数是否ugly肯定会超时. 所以我们应该从直接构造ugly数着手.