Unique Number of Occurrences - Practice Coding | SlaveCode
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1207. Unique Number of Occurrences
Easy
10 Points
Array
Hash Table
Given an array of integers arr, return true if the number of occurrences of each value in the array is unique or false otherwise.
Examples
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.
Given an array of integers arr, return true if the number of occurrences of each value in the array is unique or false otherwise.
Examples
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.