Package g0201_0300.s0204_count_primes

Class Solution

java.lang.Object

g0201_0300.s0204_count_primes.Solution

public class Solution
extends Object

204 - Count Primes.<p>Medium</p> <p>Given an integer <code>n</code>, return <em>the number of prime numbers that are strictly less than</em> <code>n</code>.</p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> n = 10</p> <p><strong>Output:</strong> 4</p> <p><strong>Explanation:</strong> There are 4 prime numbers less than 10, they are 2, 3, 5, 7.</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> n = 0</p> <p><strong>Output:</strong> 0</p> <p><strong>Example 3:</strong></p> <p><strong>Input:</strong> n = 1</p> <p><strong>Output:</strong> 0</p> <p><strong>Constraints:</strong></p> <ul> <li><code>0 <= n <= 5 * 10⁶</code></li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	countPrimes(int n)

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

countPrimes

public int countPrimes(int n)