Poj Solution 1056

http://poj.org/problem?id=1056

//* @author 洪晓鹏<hongxp11@163.com>

import java.util.ArrayList;
import java.util.Scanner;

public class Main {

/**
 * @param args
 */
 public static boolean isPrefix(String a, String b) {
    int len = a.length() > b.length() ? b.length() : a.length();
    if (a.substring(0, len).equals(b.substring(0, len)))
      return true;
    else
        return false;
 }

public static void main(String[] args) {
  ArrayList< String> array = new ArrayList< String>();
  Scanner in = new Scanner(System.in);
  int num = 1;
  boolean skip = false;
  while (in.hasNext()) {
    String temp = in.next();
    if (temp.equals("9")) {
     int len = array.size();
     for (int i = 0; i < len - 1; i++) {
      for (int j = i + 1; j < len; j++) {
        if (isPrefix(array.get(i), array.get(j))) {
         skip = true;
        }
       }
    }
    if (!skip) {
     System.out.println("Set " + num+ " is immediately decodable");
    } else {
     System.out.println("Set " + num+ " is not immediately decodable");
    }
        skip = false;
        num++;
        array.clear();
        continue;
    } else {
        array.add(temp);
    }
  }
 }

}