剑指offer--面试题34： 丑数

题目描述

# -*- coding:utf-8 -*-
class Solution:
    def GetUglyNumber_Solution(self, index):
        # write code here
        if index==0 or index==1:
            return index
        uglyNums = [0]*index
        uglyNums[0] = 1
        idxOf2, idxOf3, idxOf5 = 0,0,0
        for i in range(1, index):
            uglyNums[i] = min(2*uglyNums[idxOf2], 3*uglyNums[idxOf3], 5*uglyNums[idxOf5])
            if uglyNums[i]%2==0:
                idxOf2 += 1
            if uglyNums[i]%3==0:
                idxOf3 += 1
            if uglyNums[i]%5==0:
                idxOf5 += 1           
            i += 1
        return uglyNums[-1]