题目意思

题目给是一个perfect sequence的定义，即给定一个参数p，要求给定的数字中选择几个数字，组成一个满足最大项不大于最小项乘参数的数列。
即：

Given a sequence of positive integers and another positive integer p. The sequence is said to be a perfect sequence if M≤m×p where M and m are the maximum and minimum numbers in the sequence, respectively.
Now given a sequence and a parameter p, you are supposed to find from the sequence as many numbers as possible to form a perfect subsequence.

问题点

最小项是根据选定的数字变化的！
所以考虑的思路：先排序，再要要求选数字。

​