interview_prepare_rand

1. rand7生成rand10

 1 # The rand7() API is already defined for you.
 2 # def rand7():
 3 # @return a random integer in the range 1 to 7
 4 
 5 class Solution(object):
 6     def rand10(self):
 7         n=7*(rand7()-1)+(rand7()-1)
 8         while(n>39):
 9             return self.rand10()
10         
11         return n%10+1
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原文地址：https://www.cnblogs.com/zijidan/p/12501805.html