Runtime error and WA on 100 (3n+1)

[maged9182]

Okay so I've been trying to solve 3n+1 , code 100, to no avail.. Here's the code giving me the Runtime error

Code: Select all

import java.util.*;
import java.io.*;

public class Main{
   
   public static void main (String[]args) throws IOException{
      
      BufferedReader br = new BufferedReader (new InputStreamReader(System.in));
      StringBuffer sb = new StringBuffer();
      StringTokenizer st = new StringTokenizer (br.readLine());

      
      while (st.hasMoreTokens()){
         

         int a = Integer.parseInt(st.nextToken());
         int b = Integer.parseInt(st.nextToken());
         if (b<a){
            int temp = a;
            a = b;
            b=temp;
            
         }
         
         int max =0;
         for (int i=a; i<=b; i++){
            
          int c = execute(i);
          if (c>max){
             max=c;
          }
         
         }
         //System.out.println(a + " " + b + " " + max + "\n");
         sb.append(a + " " + b + " " + max + "\n");
         st = new StringTokenizer (br.readLine());

         
      }
      
      System.out.print(sb);
      System.exit(0);
      
   }
   
   public static int execute (int x){
      int count =1;
      
      while (x!=1){
         if (x%2==0){
            x=x/2;
         }
         else{
            x= 3*x+1;
         }
         count++;
      }
      return count;
      
   }
   
}


And here's the one giving me wrong answer, i changed the looping condition and how I create the tokenizer that's all

Code: Select all

import java.util.*;
import java.io.*;

public class Main{
   
   public static void main (String[]args) throws IOException{
      
      BufferedReader br = new BufferedReader (new InputStreamReader(System.in));
      StringBuffer sb = new StringBuffer();

      String line = "";

      
      while ((line=br.readLine())!=null){
         
         StringTokenizer st = new StringTokenizer (line);

         int a = Integer.parseInt(st.nextToken());
         int b = Integer.parseInt(st.nextToken());
         if (b<a){
            int temp = a;
            a = b;
            b=temp;
            
         }
         
         int max =0;
         for (int i=a; i<=b; i++){
            
          int c = execute(i);
          if (c>max){
             max=c;
          }
         
         }
         //System.out.println(a + " " + b + " " + max + "\n");
         sb.append(a + " " + b + " " + max + "\n");
         
      }
      
      System.out.print(sb);
      System.exit(0);
      
   }
   
   public static int execute (int x){
      int count =1;
      
      while (x!=1){
         if (x%2==0){
            x=x/2;
         }
         else{
            x= 3*x+1;
         }
         count++;
      }
      return count;
      
   }
   
}


Any help?

[brianfry713]

http://online-judge.uva.es/problemset/d ... .java.html

[bashie]

That doesn't help much. I'm getting this same "runtime error" issue. Not having problems resolving problem, but understanding how this thing compiles. I even tried deleting the "public" in the main from that example to no avail.

I'm pasting the code in the textbox, so it is a single file source code.
My classes do not belong to any package.
My class is named "Main" and has a static main method (tried with public as the example and without it).
The word "public" is not used in any place of my code, not for classes, methods or anything.
Using buffered i/o.

So why is it that my code generates a runtime error when tested locally (even with wrong input data) works fine? :S

[bashie]

ok, I found the thing that was giving the runtime error.

For every method you call, you should not use the implicit "this." you have to write it.