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| class Solution {
private static class Trie {
private static class TrieNode {
private final TrieNode[] children;
private String word;
public TrieNode() {
this.children = new TrieNode[26];
}
}
private final TrieNode root;
public Trie() {
this.root = new TrieNode();
}
public void insert(String word) {
TrieNode node = root;
for (int i = 0; i < word.length(); i++) {
int offset = word.charAt(i) - 'a';
if (node.children[offset] == null) {
node.children[offset] = new TrieNode();
}
node = node.children[offset];
}
node.word = word;
}
public String getRootWord(String word) {
TrieNode node = root;
for (int i = 0; i < word.length(); i++) {
int offset = word.charAt(i) - 'a';
if (node.children[offset] == null) {
return null;
}
node = node.children[offset];
if (node.word != null) {
break;
}
}
return node.word;
}
}
public String replaceWords(List<String> dictionary, String sentence) {
Trie trie = new Trie();
for (String word : dictionary) {
trie.insert(word);
}
String[] words = sentence.split(" ");
for (int i = 0; i < words.length; i++) {
String rootWord = trie.getRootWord(words[i]);
if (rootWord != null) {
words[i] = rootWord;
}
}
return String.join(" ", words);
}
}
|
References
648. Replace Words
剑指 Offer II 063. 替换单词