Package 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().<p>Medium</p> <p>Given the <strong>API</strong> <code>rand7()</code> that generates a uniform random integer in the range <code>[1, 7]</code>, write a function <code>rand10()</code> that generates a uniform random integer in the range <code>[1, 10]</code>. You can only call the API <code>rand7()</code>, and you shouldn&rsquo;t call any other API. Please <strong>do not</strong> use a language&rsquo;s built-in random API.</p> <p>Each test case will have one <strong>internal</strong> argument <code>n</code>, the number of times that your implemented function <code>rand10()</code> will be called while testing. Note that this is <strong>not an argument</strong> passed to <code>rand10()</code>.</p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> n = 1</p> <p><strong>Output:</strong> [2]</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> n = 2</p> <p><strong>Output:</strong> [2,8]</p> <p><strong>Example 3:</strong></p> <p><strong>Input:</strong> n = 3</p> <p><strong>Output:</strong> [3,8,10]</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= n <= 10⁵</code></li> </ul> <p><strong>Follow up:</strong></p> <ul> <li>What is the <a href="https://en.wikipedia.org/wiki/Expected_value" target="_top">expected value</a> for the number of calls to <code>rand7()</code> function?</li> <li>Could you minimize the number of calls to <code>rand7()</code>?</li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	rand10()

Methods inherited from class java.lang.Object

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

Constructor Details

Solution

public Solution()

Method Details

rand10

public int rand10()