Package g1201_1300.s1207_unique_number_of_occurrences

Class Solution

java.lang.Object

g1201_1300.s1207_unique_number_of_occurrences.Solution

public class Solution
extends Object

1207 - Unique Number of Occurrences.<p>Easy</p> <p>Given an array of integers <code>arr</code>, return <code>true</code> if the number of occurrences of each value in the array is <strong>unique</strong> , or <code>false</code> otherwise.</p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> arr = [1,2,2,1,1,3]</p> <p><strong>Output:</strong> true</p> <p><strong>Explanation:</strong> The value 1 has 3 occurrences, 2 has 2 and 3 has 1. No two values have the same number of occurrences.</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> arr = [1,2]</p> <p><strong>Output:</strong> false</p> <p><strong>Example 3:</strong></p> <p><strong>Input:</strong> arr = [-3,0,1,-3,1,1,1,-3,10,0]</p> <p><strong>Output:</strong> true</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= arr.length <= 1000</code></li> <li><code>-1000 <= arr[i] <= 1000</code></li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
boolean	uniqueOccurrences(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

uniqueOccurrences

public boolean uniqueOccurrences(int[] arr)