Hello my code running prefect in my pc but in ShareCode runtime error. I'm very confused. please help me

Hi, probably you wanna reach a NEGATIVE-INDEX of the Array in your code, take a look at the indices and make sure this is correct.

And also pay more attention to the input/output format. I suggest to create a testcase with more than one input block and test your app against it.

Tanx Sivan and AMiR. my code : import java.util.Scanner;

    public class HelloWorld {

    public static void main(String[] args) {
         Scanner input = new Scanner(System.in);
         int number, test, g, b;
         test = input.nextInt();
         input.nextLine();
         number = input.nextInt();
         input.nextLine();
         while (test-- > 0) {
            String str[] = new String[number];
            for (int i = 0; i < number; i++) {
                str[i] = input.nextLine();
                for (String part : str[i].split(" "))
                   System.out.print(new StringBuilder(part).reverse().toString() + " ");
                System.out.println("\b");
            }
            if (test == 1)
                System.out.println();
           }
       }
    }

I modified your code a little bit.

```

import java.util.Scanner;
public class Main {

public static void main(String[] args) {
     Scanner input = new Scanner(System.in);
     int number, test, g, b;
     test = input.nextInt();
     input.nextLine();

     while (test-- > 0) {
        // YOU NEED TO READ THE NUMBER OF LINES FOR EACH INPUT BLOCK
        number = input.nextInt();
        input.nextLine();
        String str[] = new String[number];
        for (int i = 0; i < number; i++) {
            str[i] = input.nextLine();
            int first = 1;
            for (String part : str[i].split(" ")) {
                // PRINTING `\b` IS NOT SAFE. TRY TO MANAGE PRINTING THE SPACE CHARACTER
                if (first == 1) first = 0;
                else System.out.print(" ");
                System.out.print(new StringBuilder(part).reverse().toString()); 
            }
            System.out.println();

        }
        // YOU NEED TO PRINT A BLANK LINE BETWEEN EACH TEST BLOCK
        if (test != 0)
            System.out.println();
       }
   }
}

```

tanx AMiR.