Today's Challenge

https://leetcode.com/problems/unique-number-of-occurrences/

Unique Number of Occurrences - LeetCode

Counter를 쓰면 좀 더 간편하게 풀수 있는걸로 알고는 있는데,
나는 dictionary가 편해서 그냥 그걸로 품.

class Solution:
    def uniqueOccurrences(self, arr: List[int]) -> bool:
        d = {}
        for ar in arr:
            if not d.get(ar):
                d[ar] = 1
                continue
            d[ar] += 1
        
        vv = d.values()
        dd = {}
        for v in vv:
            if not dd.get(v):
                dd[v] = 1
                continue
            return False
        return True