Strobogrammatic_Numbers.py

# Write a Python Program to get all strobogrammatic numbers that are of length n.
'''
A strobogrammatic number is a number whose numeral is rotationally symmetric, so that it appears the same
when rotated 180 degrees. In Other words, the numeral looks the same right-side up and upside down
(e.g., 69,96,1001)
'''
def gen_strobogrammatic(n):
    """
    :type n: int
    :rtype: List[str]
    """
    result = helper(n, n)
    return result

def helper(n, length):
    if n == 0:
        return[""]
    if n == 1:
        return["1", "0", "8"]
    middles = helper(n-2, length)
    result = []
    for middle in middles:
        if n != length:
            result.append("0" + middle + "0")
            result.append("8" + middle + "8")
            result.append("1" + middle + "1")
            result.append("9" + middle + "6")
            result.append("6" + middle + "9")
        return result

print("n = 2: \n",gen_strobogrammatic(2))
print("n = 3: \n",gen_strobogrammatic(3))
print("n = 4: \n",gen_strobogrammatic(4))