【python3】leetcode 884. Uncommon Words from Two Sentences （easy）

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 884. Uncommon Words from Two Sentences （easy） 

We are given two sentences A and B.  (A sentence is a string of space separated words.  Each word consists only of lowercase letters.)

A word is uncommon if it appears exactly once in one of the sentences, and does not appear in the other sentence.

Return a list of all uncommon words. 

You may return the list in any order.

Example 1:

Input: A = "this apple is sweet", B = "this apple is sour"
Output: ["sweet","sour"]

Example 2:

Input: A = "apple apple", B = "banana"
Output: ["banana"]

首先要满足出现only once

其次是异或，即只在A中出现或只在B中出现 

class Solution:
    def uncommonFromSentences(self, A, B):
        """
        :type A: str
        :type B: str
        :rtype: List[str]
        """
        uncommon = []
        AList = A.split()
        BList = B.split()
        Acount = collections.Counter(AList)
        Bcount = collections.Counter(BList)
        Aset = {key for key,count in Acount.items() if count == 1}
        Bset = {key for key,count in Bcount.items() if count == 1}
        ABset = set(AList) & set(BList)
        return list({x for x in Aset^Bset if x not in ABset})

Runtime: 36 ms, faster than 98.82% of Python3