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LeetCode solutions

1319. Unique Number of Occurrences

My accepted Python solution to LeetCode problem 1319, Unique Number of Occurrences, running in 3ms.

  • Difficulty: Easy
  • Python
  • Runtime 3ms
  • Memory 17.4MB

Read the problem on LeetCode View on GitHub

The problem statement is LeetCode’s and stays on their site. What follows is my accepted solution.

Python

Accepted on LeetCode — runtime 3ms, memory 17.4MB, accepted 2025-12-30.

python
class Solution:
    def uniqueOccurrences(self, arr: List[int]) -> bool:
        from collections import Counter
        count = Counter(arr)
        occurrences = list(count.values())
        return len(occurrences) == len(set(occurrences))

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