1207. Unique Number of Occurrences
1207. Unique Number of Occurrences 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. 1 2 3 4 5 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. 1 2 3 4 Example 2: Input: arr = [1,2] Output: false 1 2 3 4 Example 3: Input: arr = [-3,0,1,-3,1,1,1,-3,10,0] Output: true Constraints:...