Package g1301_1400.s1394_find_lucky_integer_in_an_array

Class Solution

java.lang.Object

g1301_1400.s1394_find_lucky_integer_in_an_array.Solution

public class Solution
extends Object

1394 - Find Lucky Integer in an Array.<p>Easy</p> <p>Given an array of integers <code>arr</code>, a <strong>lucky integer</strong> is an integer that has a frequency in the array equal to its value.</p> <p>Return <em>the largest <strong>lucky integer</strong> in the array</em>. If there is no <strong>lucky integer</strong> return <code>-1</code>.</p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> arr = [2,2,3,4]</p> <p><strong>Output:</strong> 2</p> <p><strong>Explanation:</strong> The only lucky number in the array is 2 because frequency[2] == 2.</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> arr = [1,2,2,3,3,3]</p> <p><strong>Output:</strong> 3</p> <p><strong>Explanation:</strong> 1, 2 and 3 are all lucky numbers, return the largest of them.</p> <p><strong>Example 3:</strong></p> <p><strong>Input:</strong> arr = [2,2,2,3,3]</p> <p><strong>Output:</strong> -1</p> <p><strong>Explanation:</strong> There are no lucky numbers in the array.</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= arr.length <= 500</code></li> <li><code>1 <= arr[i] <= 500</code></li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	findLucky(int[] arr)

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

findLucky

public int findLucky(int[] arr)