Package g1201_1300.s1207_unique_number_of_occurrences

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    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

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final Boolean uniqueOccurrences(IntArray arr)

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait