CIELAB under "Easy" of the practice section. It Shows WA and i don't know why yet

help
1 
import java.util.*;
import java.lang.*;
import java.io.*;
class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner sc = new Scanner(System.in);
		int first = sc.nextInt();
		int second = sc.nextInt();
		int diff = first - second;
		int no_of_digits = Integer.toString(diff).length();
		if (no_of_digits == 1)
		{
		    if(diff == 0)
		        diff ++;
		    else
		        diff --;
		}
		else   //multi digit number
		{
		    String str = String.valueOf(diff);
		    int index = str.indexOf('0');
		    if(index == -1)   // no zero in number
		    {
		        diff -- ;
		    }
		    else   // 0 is present in the answer
		    {
		        StringBuffer sb = new StringBuffer(str);
		        sb.setCharAt(index,'9');
		        str = sb.toString();
		        diff = Integer.parseInt(str);
		    }
		}
		System.out.println(diff);
	}
}
2

Please format your code (use the </> “Preformatted Text” in the edit box :))

Edit:

My initial answer was wrong - withdrawn :slight_smile:

Edit2:

Aha -

Your answer must be a positive integer

What is your output for

31 30

?

3

You can do something better than this because MD provide the code embadding on basis of language which provide syntax highlighting too.

You can do something like this

```programming language you want like cpp
Then your code should be here
```
1 Like
4

my answer for 31 30 is 0

5

Is that a positive integer?

6

Ooh, thanks - testing:

import java.util.*;
import java.lang.*;
import java.io.*;
class Codechef
{
    public static void main (String[] args) throws java.lang.Exception
    {
        Scanner sc = new Scanner(System.in);
        int first = sc.nextInt();
        int second = sc.nextInt();
        int diff = first - second;
        int no_of_digits = Integer.toString(diff).length();
        if (no_of_digits == 1)
        {
            if(diff == 0)
                diff ++;
            else
                diff --;
        }
        else //multi digit number
        {
            String str = String.valueOf(diff);
            int index = str.indexOf('0');
            if(index == -1) // no zero in number
            {
                diff -- ;
            }
            else // 0 is present in the answer
            {
                StringBuffer sb = new StringBuffer(str);
                sb.setCharAt(index,'9');
                str = sb.toString();
                diff = Integer.parseInt(str);
            }
        }
        System.out.println(diff);
    }
}

Nice - thanks for the info!

7

Oh my god…
this was the problem
0 is neither positive nor negative integer and i missed that :stuck_out_tongue:
Thank you very much for pointing it out …

1 Like