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648. Replace Words - 单词替换

在英语中,我们有一个叫做 词根(root)的概念,它可以跟着其他一些词组成另一个较长的单词——我们称这个词为 继承词(successor)。例如,词根an,跟随着单词 other(其他),可以形成新的单词 another(另一个)。

现在,给定一个由许多词根组成的词典和一个句子。你需要将句子中的所有继承词词根替换掉。如果继承词有许多可以形成它的词根,则用最短的词根替换它。

你需要输出替换之后的句子。

示例 1:

输入: dict(词典) = ["cat", "bat", "rat"]
sentence(句子) = "the cattle was rattled by the battery"
输出: "the cat was rat by the bat"

注:

  1. 输入只包含小写字母。
  2. 1 <= 字典单词数 <=1000
  3. 1 <=  句中词语数 <= 1000
  4. 1 <= 词根长度 <= 100
  5. 1 <= 句中词语长度 <= 1000

题目标签:Trie / Hash Table

题目链接:LeetCode / LeetCode中国

题解

Language Runtime Memory
python3 252 ms N/A
class Solution:
    def replaceWords(self, dict, sentence):
        """
        :type dict: List[str]
        :type sentence: str
        :rtype: str
        """
        res = []
        dic = sorted(dict, key=lambda x: len(x))
        for word in sentence.split():
            for r in dic:
                if word.startswith(r):
                    res.append(r)
                    break
            else:
                res.append(word)
        return ' '.join(res)