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[杂题] pku 1338 ugly numbers (STL解)

2013年08月12日 ⁄ 综合 ⁄ 共 992字 ⁄ 字号 评论关闭

 

Ugly Numbers
Description
Ugly numbers are numbers whose only prime factors are 2, 3 or 5. The sequence
1, 2, 3, 4, 5, 6, 8, 9, 10, 12, ...
shows the first 10 ugly numbers. By convention, 1 is included.
Given the integer n,write a program to find and print the n'th ugly number.

 

Input

Each line of the input contains a postisive integer n (n <= 1500).Input is terminated by a line with n=0.

 

Output

For each line, output the n’th ugly number .:Don’t deal with the line with n=0.

 

Sample Input

1
2
9
0

 

Sample Output

1
2
10
算法分析:利用一个优先队列维护已经满足条件的ugly numbers,然后依次按照dp的思想进行插入变化
code:

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