1817. Find the number of users of users active One question daily

1817. Find the number of users of users active

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我的answer：

This question is mainlyHash tableKnowledge point，But we can usedefaultdictDo，You can save a few lines of code。
defaultdictIt can assume that existencekeyInitial value，So we only use directlyappend()oradd()Be。
这次和官方answer一模一样呢!

class Solution:
    def findingUsersActiveMinutes(self, logs: List[List[int]], k: int) -> List[int]:
        dict1 = defaultdict(set)
        list1 = [0] * k
        for i, j in logs:
            dict1[i].add(j)
        for i in dict1:
            print(dict1[i])
            # TypeError object of type ‘type‘ has no len() Because ofdictLess1
            list1[len(dict1[i]) - 1] += 1
        return list1