'''
1207. Unique Number of Occurrences
Difficulty: Easy
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


'''

class Solution(object):
    def uniqueOccurrences(self, arr):
        """
        :type arr: List[int]
        :rtype: bool
        """

        num = set(arr)
        count = set([arr.count(n) for n in arr])
        return len(num) == len(count)
