class Solution {
public:
string replaceWords(vector<string>& dictionary, string sentence) {
}
};
648. 单词替换
在英语中,我们有一个叫做 词根
(root) 的概念,可以词根后面添加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 dictionary
和一个用空格分隔单词形成的句子 sentence
。你需要将句子中的所有继承词用词根替换掉。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:dictionary = ["cat","bat","rat"], sentence = "the cattle was rattled by the battery" 输出:"the cat was rat by the bat"
示例 2:
输入:dictionary = ["a","b","c"], sentence = "aadsfasf absbs bbab cadsfafs" 输出:"a a b c"
提示:
1 <= dictionary.length <= 1000
1 <= dictionary[i].length <= 100
dictionary[i]
仅由小写字母组成。1 <= sentence.length <= 10^6
sentence
仅由小写字母和空格组成。sentence
中单词的总量在范围 [1, 1000]
内。sentence
中每个单词的长度在范围 [1, 1000]
内。sentence
中单词之间由一个空格隔开。sentence
没有前导或尾随空格。
相似题目
原站题解
python3 解法, 执行用时: 552 ms, 内存消耗: 21.4 MB, 提交时间: 2022-11-17 16:21:37
class Solution: def replaceWords(self, dictionary: List[str], sentence: str) -> str: ds = set(dictionary) words = sentence.split(' ') for i, word in enumerate(words): for j in range(1, len(word)+1): if word[:j] in ds: words[i] = word[:j] break return ' '.join(words)
golang 解法, 执行用时: 52 ms, 内存消耗: 8.8 MB, 提交时间: 2022-11-17 16:21:24
func replaceWords(dictionary []string, sentence string) string { dictionarySet := map[string]bool{} for _, s := range dictionary { dictionarySet[s] = true } words := strings.Split(sentence, " ") for i, word := range words { for j := 1; j <= len(word); j++ { if dictionarySet[word[:j]] { words[i] = word[:j] break } } } return strings.Join(words, " ") }