Uncommon Words From Two Sentences

# 問題

2文s1，s2が与えられる．片方の文に一度だけ登場する単語のリストを返す関数を実装せよ．

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s1 = "this apple is sweet"
s2 = "this apple is sour"
-> ["sweet","sour"]

# 解法

片方に一度だけ登場する単語は全体でも一度だけしか登場しない．

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class Solution:
    def uncommonFromSentences(self, s1: str, s2: str) -> List[str]:
        s = s1 + " " + s2
        freq = Counter(s.split())
        ans = []
        for k, v in freq.items():
            if v == 1:
                ans.append(k)
        return ans

# 出典

https://leetcode.com/problems/uncommon-words-from-two-sentences/