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JAVA ²ÊƱ³ÌÐò

import java.io.*;
public class CaiPiao {
 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  String str;
  BufferedReader bufferReader = new BufferedReader(new InputStreamReader(System.in));
  try
  {
   str = bufferReader.readLine();
  }
  catch (IOException exc)
  {
   System.out.println("Error read from stdin!");
   return ;
  }
  
  int len = str.length();
  int[] number=new int[len];
  
     for(int i = 0; i < len; i++){
      number[i]=Integer.parseInt(str.substring(i,i+1));
     } 
         
     // 1234567890123
     int flag = 0;
     for( int i = 0; i < 13; i++ ){
      if( i >= 9 ){
       if( number[i] == (i - 9) ){
        flag++;
       }
         }else if( number[i] == (i+1) ){
          flag++;
         }
     }
         
     if( flag == 13 ){
      System.out.println("1");
     }else if( flag == 12 ){
      System.out.println("2");
     }else if( flag == 11 ){
      System.out.println("3");
     }else{
      System.out.println("No");
     }
     &nb


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1. java.lang.nullpointerexception
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import java.text.SimpleDateFormat;
import java.util.Date;
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