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  1.  
  2.  
  3.  
  4. import java.io.*;
  5. import java.util.*;
  6.  
  7.  
  8.  
  9. public class Main {
  10.  
  11.  
  12.     public static void main(String[] args)throws IOException {
  13.  
  14.         Scanner in=new Scanner(System.in);
  15.         BufferedReader inp=new BufferedReader(new InputStreamReader(System.in));
  16.         int n,l,flag=0,i,ln;
  17.         String q="",c="",ch="";
  18.         n=in.nextInt();
  19.         ArrayList g1=new ArrayList();
  20.         do{
  21.         ch=inp.readLine();
  22.         if(ch.equalsIgnoreCase("q00"))
  23.         {
  24.             q=ch;
  25.             ln=g1.size();
  26.             System.out.println(ln);
  27.             if(ln%2==0&&ln!=0)
  28.             {
  29.                 flag++;
  30.             }
  31.             System.out.println(flag);
  32.         }
  33.         else if(ch.equalsIgnoreCase("-1"))
  34.                 System.exit(0);
  35.         else
  36.         {
  37.         c=ch;
  38.         l=c.length();
  39.         char a=ch.charAt(1);
  40.         char b=ch.charAt(2);
  41.         Iterator itr=g1.iterator();
  42.          while(itr.hasNext())
  43.          {
  44.              char chk=(char) itr.next();
  45.              if(chk!=a||chk!=b)
  46.              {
  47.               g1.add(a);
  48.              g1.add(b);
  49.              }
  50.  
  51.  
  52.          }
  53.         }
  54.          System.out.println(g1);
  55.         }while(n!=0);     
  56.     }
  57.  
  58. }
  59.  
Runtime error #stdin #stdout #stderr 0.17s 321344KB
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stdin
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5
c12
stdout
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Standard output is empty
stderr
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Exception in thread "main" java.lang.NullPointerException
	at Main.main(Main.java:22)
https://ideone.com/6mpmOK
language:
Java (12.0.1)
created:
8 years ago
visibility:
public

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