2025-08-01 10:24:00 +0000 UTC

class Solution:
    def uncommonFromSentences(self, s1: str, s2: str) -> List[str]:
        freqs1, freqs2 = defaultdict(int), defaultdict(int)
        words1, words2 = s1.split(" "), s2.split(" ")
        for word in words1:
            freqs1[word] += 1
        for word in words2:
            freqs2[word] += 1
        res = []
        for word, freq in freqs1.items():
            if freq != 1 or word in freqs2:
                continue
            res.append(word)
        for word, freq in freqs2.items():
            if freq != 1 or word in freqs1:
                continue
            res.append(word)
        return res