Package g0501_0600.s0507_perfect_number

Class Solution

java.lang.Object

g0501_0600.s0507_perfect_number.Solution

public class Solution
extends Object

507 - Perfect Number.<p>Easy</p> <p>A <a href="https://en.wikipedia.org/wiki/Perfect_number" target="_top"><strong>perfect number</strong></a> is a <strong>positive integer</strong> that is equal to the sum of its <strong>positive divisors</strong> , excluding the number itself. A <strong>divisor</strong> of an integer <code>x</code> is an integer that can divide <code>x</code> evenly.</p> <p>Given an integer <code>n</code>, return <code>true</code> <em>if</em> <code>n</code> <em>is a perfect number, otherwise return</em> <code>false</code>.</p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> num = 28</p> <p><strong>Output:</strong> true</p> <p><strong>Explanation:</strong> 28 = 1 + 2 + 4 + 7 + 14 1, 2, 4, 7, and 14 are all divisors of 28.</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> num = 7</p> <p><strong>Output:</strong> false</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= num <= 10⁸</code></li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
boolean	checkPerfectNumber(int num)

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

checkPerfectNumber

public boolean checkPerfectNumber(int num)