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| class Solution {
public String replaceWords(List<String> dictionary, String sentence) {
Trie trie = new Trie();
for (String s : dictionary) trie.insert(s);
StringBuilder builder = new StringBuilder();
for (String word : sentence.split(" ")) {
builder.append(trie.query(word)).append(" ");
}
return builder.substring(0, builder.length() - 1);
}
private static class Trie {
private Trie[] next;
private boolean isEnd;
public Trie() {
next = new Trie[26];
isEnd = false;
}
public void insert(String word) {
Trie node = this;
for (int i = 0; i < word.length(); ++i) {
char c = word.charAt(i);
if (node.next[c - 'a'] == null) {
node.next[c - 'a'] = new Trie();
}
node = node.next[c - 'a'];
}
node.isEnd = true;
}
public String query(String word) {
Trie node = this;
for (int i = 0; i < word.length(); ++i) {
char c = word.charAt(i);
if (node.next[c - 'a'] == null) break;
if (node.next[c - 'a'].isEnd) return word.substring(0, i + 1);
node = node.next[c - 'a'];
}
return word;
}
}
}
|
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