Given a function rand7 which generates a uniform random integer in the range 1 to 7, write a function rand10 which generates a uniform random integer in the range 1 to 10.
Do NOT use system‘s Math.random().
Example 1:
Input: 1
Output: [7]
Example 2:
Input: 2
Output: [8,4]
Example 3:
Input: 3
Output: [8,1,10]
Note:
rand7 is predefined.n, the number of times that rand10 is called.
Follow up:
rand7() function?rand7()?
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[LeetCode] Implement Rand10() Using Rand7() 使用Rand7()来实现Rand10()
原文：https://www.cnblogs.com/grandyang/p/9727206.html