Poj Solution 3630

http://poj.org/problem?id=3630

import java.util.Scanner;   
  
public class Main {   
    private static Trie trie = new Trie();   
    private static boolean isConsistent = true;   
  
    public static void main(String[] args) {   
        Scanner sc = new Scanner(System.in);   
        int t = sc.nextInt();   
        for (int i = 0; i < t; ++i) {   
            int n = sc.nextInt();   
            sc.nextLine();   
            trie = new Trie();   
            isConsistent = true;   
            for (int j = 0; j < n; ++j) {   
                String phone = sc.nextLine();   
                if (isConsistent)   
                    buildTrie(phone);   
            }   
            if (isConsistent)   
                System.out.println("YES");   
            else  
                System.out.println("NO");   
        }   
    }   
  
    static void buildTrie(String s) {   
        // char[] c = s.toCharArray();   
        int len = s.length();   
        Trie tmpTrie = trie;   
        for (int i = 0; i < len; ++i) {   
            int ch = Integer.parseInt(s.substring(i, i + 1));   
            // System.out.println(ch+"---"+(int)ch);   
            Trie tmp = tmpTrie.next[ch];   
            if (tmp == null) {   
                tmp = new Trie();   
                tmp.node = 1;   
                if (i == len - 1)   
                    tmp.isDispear = true;// 表示这是一个电话的结尾   
                tmpTrie.next[ch] = tmp;   
                tmpTrie = tmp;   
            } else {   
                if (tmp.isDispear) {   
                    isConsistent = false;   
                    break;   
                }   
  
                if (i == len - 1) {   
                    isConsistent = false;   
                    break;   
                }   
                tmpTrie = tmp;   
            }   
        }   
    }   
  
    private static class Trie {   
        int node = 0;   
        boolean isDispear = false;//是否是某个电话号码的最后一个   
        Trie[] next = new Trie[10];   
    }   
}  

//出处：<a href="http://blog.csdn.net/lazy_p/archive/2010/06/21/5683414.aspx" target="_blank">http://blog.csdn.net/lazy_p/archive/2010/06/21/5683414.aspx</a>