11. 11. Reverse Matrix Diagonals

package javaAdv;

import java.util.Arrays;
import java.util.Scanner;

public class ReverseMatrixDiagonals_11 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int [] dimensions = Arrays.stream(scanner.nextLine().split(" "))
                .mapToInt(Integer::parseInt)
                .toArray(); //[4, 5]
        int rows = dimensions[0]; //брой редове
        int cols = dimensions[1]; //брой колони

        int [][] matrix = new int[rows][cols];

        //1. въвеждаме матрицата
        fillMatrix(matrix, scanner);

        //2. Print First Part
        for (int c = cols - 1; c > 0; c--) { //за всеки един диагонал
            for (int row = rows - 1, col = c; row >= 0 && col < cols ; row--, col++) {
                System.out.print(matrix[row][col] + " ");
            }
            System.out.println();
        }

        //3. Print Second Part
        for (int r = rows - 1; r >= 0; r--) { //за всеки един диагонал
            for (int row = r, col = 0; row >= 0 && col < cols ; row--, col++) {
                System.out.print(matrix[row][col] + " ");
            }
            System.out.println();
        }
    }

    private static void fillMatrix(int[][] matrix, Scanner scanner) {
        for (int row = 0; row < matrix.length; row++) {
            matrix[row] = Arrays.stream(scanner.nextLine()
                            .split("\\s+"))
                    .mapToInt(Integer::parseInt).toArray();
        }
    }
}