LeetCode içerisinde bulunan “Unique Number of Occurrences” sorusunun açıklaması ve çözümü. Size verilen tamsayı dizisinde bulunan tüm sayılardan, adet olarak hepsinin birbirinden farklı olup olmadığı soruluyor.

✨ LeetCode 1207. Unique Number of Occurrences: https://leetcode.com/problems/unique-number-of-occurrences/

➡️ Problem açıklaması:

Given an array of integers arr, write a function that returns true if and only if the number of occurrences of each value in the array is unique.

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