力扣884. 两句话中的不常见单词（#Day24）

def hash_solution(s1: str, s2: str) -> List[str]:
    s = s1.split() + s2.split()
    hash_dic = defaultdict(int)
    res = []
    for i in s:
        hash_dic[i] += 1
    for i, j in hash_dic.items():  # 哈希表的key是单词，值是出现的次数
        if j == 1:
            res.append(i)
    return res
    
s1 = "this apple is sweet"
s2 = "this apple is sour"
print(hash_solution(s1, s2))  # ['sweet', 'sour']

def uncommonFromSentences(s1: str, s2: str) -> List[str]:
    s = s1.split() + s2.split()
    return [i for i in s if s.count(i) == 1]

def walrus_solution(s1: str, s2: str) -> List[str]:
    return [k for k, v in c.items() if v == 1] if (c := Counter(s1.split()) + Counter(s2.split())) else []