g0401_0500.s0470_implement_rand10_using_rand7

Class Solution

java.lang.Object

g0401_0500.s0470_implement_rand10_using_rand7.Solution

public class Solution
extends Object

470 - Implement Rand10() Using Rand7().

Medium

Given the API rand7() that generates a uniform random integer in the range [1, 7], write a function rand10() that generates a uniform random integer in the range [1, 10]. You can only call the API rand7(), and you shouldn’t call any other API. Please do not use a language’s built-in random API.

Each test case will have one internal argument n, the number of times that your implemented function rand10() will be called while testing. Note that this is not an argument passed to rand10().

Example 1:

Input: n = 1

Output: [2]

Example 2:

Input: n = 2

Output: [2,8]

Example 3:

Input: n = 3

Output: [3,8,10]

Constraints:

• 1 <= n <= 105

Follow up:

• What is the expected value for the number of calls to rand7() function?
• Could you minimize the number of calls to rand7()?

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	rand10()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

rand10

public int rand10()