I'm getting the correct output per the example, what am I doing wrong?

Could anyone explain why Math.round rounds a -3.5 to -3 and a positive 3.5 to 4?

I think they don't only check our final output alone, i think they check our implementation method as well

Thanks for your Math.round() Even though I implemented my own logic to handle the Math.round() function and it worked, the task wouldn't pass verification test. But on using Math.round() it passed smoothly. Maybe they wanted me to know that there's a method like this because if I knew I had forgotten.

One problem with your solution that I see is that your output file ends with a space. I solved this by adding the output to a Stringbuilder, i call mine sb, and then removing the last character after the loop So it would be at lines 56 and 57:

sb.append(i+" ");

and then after the loop:

sb.deleteCharAt(sb.length()-1);

Then you can write it to file like this:

for(char x : sb.toString().toCharArray()) writer.write(x);

Make sure to remove lines 57-60 if you implement this solution as all those '-' would be put at the front of the file.