Leetcode 1207. Unique Number of Occurrences

Posted 2021-08-08 SnailTyan

文章作者：Tyan
博客：noahsnail.com  |  CSDN  |  简书

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

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/