39 lines
876 B
Java
39 lines
876 B
Java
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// https://en.wikipedia.org/wiki/Trie
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public class Trie {
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static class TrieNode {
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TrieNode[] children = new TrieNode[128];
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boolean leaf;
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}
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public static void insertString(TrieNode root, String s) {
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TrieNode cur = root;
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for (char ch : s.toCharArray()) {
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if (cur.children[ch] == null) {
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cur.children[ch] = new TrieNode();
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}
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cur = cur.children[ch];
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}
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cur.leaf = true;
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}
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public static void printSorted(TrieNode node, String s) {
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for (char ch = 0; ch < node.children.length; ch++) {
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TrieNode child = node.children[ch];
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if (child != null)
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printSorted(child, s + ch);
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}
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if (node.leaf) {
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System.out.println(s);
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}
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}
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// Usage example
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public static void main(String[] args) {
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TrieNode root = new TrieNode();
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insertString(root, "hello");
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insertString(root, "world");
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insertString(root, "hi");
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printSorted(root, "");
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}
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}
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