g0501_0600.s0507_perfect_number

Class Solution

java.lang.Object

g0501_0600.s0507_perfect_number.Solution

public class Solution
extends Object

507 - Perfect Number.

Easy

A perfect number is a positive integer that is equal to the sum of its positive divisors , excluding the number itself. A divisor of an integer x is an integer that can divide x evenly.

Given an integer n, return true if n is a perfect number, otherwise return false.

Example 1:

Input: num = 28

Output: true

Explanation: 28 = 1 + 2 + 4 + 7 + 14 1, 2, 4, 7, and 14 are all divisors of 28.

Example 2:

Input: num = 7

Output: false

Constraints:

• 1 <= num <= 108

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
boolean	checkPerfectNumber(int num)

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

checkPerfectNumber

public boolean checkPerfectNumber(int num)