Hactoberfest2021/Zigzagpattern_string.py at main · HacterCalling/Hactoberfest2021 · GitHub

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# Function to print given string in the zigzag form in `k` rows
def printZigZag(s, k):

    # base case
    if k == 0:
        return

    # base case
    if k == 1:
        print(s, end='')
        return

    # print first row
    for i in range(0, len(s), (k - 1) * 2):
        print(s[i], end='')

    # print middle rows
    for j in range(1, k - 1):

        down = True
        i = j

        while i < len(s):
            print(s[i], end='')
            if down:            # going down
                i += (k - j - 1) * 2
            else:               # going up
                i += (k - 1) * 2 - (k - j - 1) * 2

            down = not down     # switch direction

    # print last row
    for i in range(k - 1, len(s), (k - 1) * 2):
        print(s[i], end='')


if __name__ == '__main__':

    s = 'THISPROBLEMISAWESOME'
    k = 4

    printZigZag(s, k)