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.

Easy

Given an array of integers arr, return true if the number of occurrences of each value in the array is unique , or false otherwise.

Example 1:

Input: arr = [1,2,2,1,1,3]

Output: true

Explanation: The value 1 has 3 occurrences, 2 has 2 and 3 has 1. No two values have the same number of occurrences.

Example 2:

Input: arr = [1,2]

Output: false

Example 3:

Input: arr = [-3,0,1,-3,1,1,1,-3,10,0]

Output: true

Constraints:

• 1 <= arr.length <= 1000
• -1000 <= arr[i] <= 1000

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 Detail

Solution

public Solution()

Method Detail

uniqueOccurrences

public boolean uniqueOccurrences(int[] arr)