Leetcode 1207. Unique Number of Occurrences

1. Description

2. Solution

**解析：**Version 1，先统计数字数量，再用map或set判断数量是否重复。

• Version 1

代码语言：javascript复制

class Solution:
    def uniqueOccurrences(self, arr: List[int]) -> bool:
        stat = collections.Counter(arr)
        temp = {}
        for value in stat.values():
            if value not in temp:
                temp[value] = 1
            else:
                return False
        return True

Reference

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

map set version

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