How to take input while printing mirror image if mirror is placed along one of the sides of the array

Question

Given a two dimensional array, print its mirror image if mirror is placed along one of the sides of the array.

Input

First line of input will contain a number T = number of test cases. Each test case will contain two positive integers n and m (1<=n, m<=50) on a single line separated by space. Next n lines will each contain a string of exactly m characters. Next line will contain a character 'V' or 'H'. If character is V, mirror is placed vertically along the right-most column. If the character is H, the mirror is placed horizontally along the bottom-most row.

Output

For each test case, print the n*m mirror image - n lines with strings of m character each. Print an extra empty line after output for each test case.

Sample Input

2

3 3

abc

def

ghi

V

3 4

1234

5678

9876

H

Sample Output

cba

fed

ihg

9876

5678

1234

MyApproach:

When I wrote the following Code.I am having problem while taking input. How to stop taking the input when the length of the input become equal to m characters.

Below is the code

    int arr[][]=new int[n][m];

     for(int j=0;j<n;j++)

      {   

        for(int k=0;k<m;k++)

         {

            arr[j][k]=sc.nextInt(); 
                   //but if the input is in character how can i stop 
                 //I think I need to read the characters character by character and stop hen m==3(as per Sample Input)
                 //How can I do that in java

         }


       System.out.println();

     }      

Answer 1

Try this

static void swap(String[][] array, int r1, int c1, int r2, int c2) {
    String temp = array[r1][c1];
    array[r1][c1] = array[r2][c2];
    array[r2][c2] = temp;
}

static void vertical(String[][] array) {
    int rows = array.length;
    int cols = array[0].length;
    for (int r = 0; r < rows; ++r)
        for (int c = 0; c < cols / 2; ++c)
            swap(array, r, c, r, cols - c - 1);
}

static void horizontal(String[][] array) {
    int rows = array.length;
    int cols = array[0].length;
    for (int c = 0; c < cols; ++c)
        for (int r = 0; r < rows / 2; ++r)
            swap(array, r, c, rows - r - 1, c);
}

public static void main(String[] args) {
    String s = ""
        + "2\n"
        + "3 3\n"
        + "abc\n"
        + "def\n"
        + "ghi\n"
        + "V\n"
        + "3 4\n"
        + "1234\n"
        + "5678\n"
        + "9876\n"
        + "H\n";
    try (Scanner scanner = new Scanner(s)) {
        int cases = scanner.nextInt();
        for (int i = 0; i < cases; ++i) {
            int rows = scanner.nextInt();
            int cols = scanner.nextInt();
            scanner.nextLine();
            String[][] array = new String[rows][cols];
            for (int r = 0; r < rows; ++r)
                array[r] = scanner.nextLine().split("");
            String operation = scanner.nextLine();
            if (operation.equals("H"))
                horizontal(array);
            else
                vertical(array);
            for (int r = 0; r < rows; ++r) {
                for (int c = 0; c < cols; ++c)
                    System.out.print(array[r][c]);
                System.out.println();
            }
        }

    }
}