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 java.lang.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 Details

    • Solution

      public Solution()

  • Method Details

    • uniqueOccurrences

      public boolean uniqueOccurrences(int[] arr)