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  1. import java.io.*;
  2. import java.util.*;
  3.  
  4.  
  5.  
  6. public class Main {
  7.  
  8.  
  9.     public static void main(String[] args)throws IOException {
  10.  
  11.         Scanner in=new Scanner(System.in);
  12.         BufferedReader inp=new BufferedReader(new InputStreamReader(System.in));
  13.         int n,l,flag=0,i,ln;
  14.         String q="",c="",ch="";
  15.         n=in.nextInt();
  16.         ArrayList g1=new ArrayList();
  17.         do{
  18.         ch=inp.readLine();
  19.         if(ch.equalsIgnoreCase("q00"))
  20.         {
  21.             q=ch;
  22.             ln=g1.size();
  23.             System.out.println(ln);
  24.             if(ln%2==0&&ln!=0)
  25.             {
  26.                 flag++;
  27.             }
  28.             System.out.println(flag);
  29.         }
  30.         else if(ch.equalsIgnoreCase("-1"))
  31.                 System.exit(0);
  32.         else
  33.         {
  34.         c=ch;
  35.         l=c.length();
  36.         char a=ch.charAt(1);
  37.         char b=ch.charAt(2);
  38.         Iterator itr=g1.iterator();
  39.          while(itr.hasNext())
  40.          {
  41.              char chk=(char) itr.next();
  42.              if(chk!=a||chk!=b)
  43.              {
  44.               g1.add(a);
  45.              g1.add(b);
  46.              }
  47.  
  48.  
  49.          }
  50.         }
  51.          System.out.println(g1);
  52.         }while(n!=0);     
  53.     }
  54.  
  55. }
  56.  
Runtime error #stdin #stdout #stderr 0.13s 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:19)
https://ideone.com/J6h2Oz
language:
Java (12.0.1)
created:
8 years ago
visibility:
public

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