E11ReverseMatrixDiagonals

   public static void main(String[] args) throws IOException {
        BufferedReader rd = new BufferedReader(new InputStreamReader(System.in));

        int[] info = Arrays.stream(rd.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
        int row = info[0];
        int cols = info[1];
        int[][] mat = new int[row][cols];

        for (int i = 0; i < row; i++)
            mat[i] = Arrays.stream(rd.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();

        int col = cols - 1;
        row--;

        while (row >= 0) {
            int r = row;
            int c = col;

            while (c < cols && r >= 0)
                System.out.print(mat[r--][c++] + " ");

            System.out.println();

            if (--col == -1) {
                col = 0;
                row--;
            }
        }
    }