python-programs/reverseWavePrint.py at master · spiderxv/python-programs · GitHub

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# Python3 implementation to print
# reverse wave form of matrix

R = 4
C = 4

# function to print reverse wave
# form for a given matrix
def wavePrint(m, n, arr):
    j = n - 1
    wave = 1

    # m     - Ending row index
    # n     - Ending column index
    # i, j     - Iterator
    # wave     - for Direction
    # wave = 1 - Wave direction down
    # wave = 0 - Wave direction up
    while j >= 0:

        # Check whether to go in
        # upward or downward
        if wave == 1:

            # Print the element of the
            # matrix downward since the
                        # value of wave = 1
            for i in range(m):
                print(arr[i][j], end = " "),
            wave = 0
            j -= 1


        else:
            # Print the elements of the
            # matrix upward since the
            # value of wave = 0
            for i in range(m - 1, -1, -1):
                print(arr[i][j], end = " "),

            wave = 1
            j -= 1

# Driver code
arr = [ [ 1, 2, 3, 4 ],
        [ 5, 6, 7, 8 ],
        [ 9, 10, 11, 12 ],
        [ 13, 14, 15, 16 ] ]

wavePrint(R, C, arr)