from lib_misc import product
s = """
08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 08
49 49 99 40 17 81 18 57 60 87 17 40 98 43 69 48 04 56 62 00
81 49 31 73 55 79 14 29 93 71 40 67 53 88 30 03 49 13 36 65
52 70 95 23 04 60 11 42 69 24 68 56 01 32 56 71 37 02 36 91
22 31 16 71 51 67 63 89 41 92 36 54 22 40 40 28 66 33 13 80
24 47 32 60 99 03 45 02 44 75 33 53 78 36 84 20 35 17 12 50
32 98 81 28 64 23 67 10 26 38 40 67 59 54 70 66 18 38 64 70
67 26 20 68 02 62 12 20 95 63 94 39 63 08 40 91 66 49 94 21
24 55 58 05 66 73 99 26 97 17 78 78 96 83 14 88 34 89 63 72
21 36 23 09 75 00 76 44 20 45 35 14 00 61 33 97 34 31 33 95
78 17 53 28 22 75 31 67 15 94 03 80 04 62 16 14 09 53 56 92
16 39 05 42 96 35 31 47 55 58 88 24 00 17 54 24 36 29 85 57
86 56 00 48 35 71 89 07 05 44 44 37 44 60 21 58 51 54 17 58
19 80 81 68 05 94 47 69 28 73 92 13 86 52 17 77 04 89 55 40
04 52 08 83 97 35 99 16 07 97 57 32 16 26 26 79 33 27 98 66
88 36 68 87 57 62 20 72 03 46 33 67 46 55 12 32 63 93 53 69
04 42 16 73 38 25 39 11 24 94 72 18 08 46 29 32 40 62 76 36
20 69 36 41 72 30 23 88 34 62 99 69 82 67 59 85 74 04 36 16
20 73 35 29 78 31 90 01 74 31 49 71 48 86 81 16 23 57 05 54
01 70 54 71 83 51 54 69 16 92 33 48 61 43 52 01 89 19 67 48
"""


def get_index(xs, index, default):
    if index < 0:
        return default
    try:
        return xs[index]
    except IndexError:
        return default


def get_lists_for_all_directions():
    # horizontal lists
    hss = [list(map(int, h.split())) for h in s.split('\n') if h]
    # vertical lists
    vss = [list(vs) for vs in zip(*hss)]
    # diagonal from top left to bottom right
    dss_1 = [[get_index(hs, -19 + i + j, 1) for j, hs in enumerate(hss)]
             for i in range(39)]
    # diagonal from bottom left to top right
    dss_2 = [[get_index(hs, -19 + i + j, 1) for j, hs in enumerate(hss[::-1])]
             for i in range(39)]
    # all lists
    xss = hss + vss + dss_1 + dss_2
    return xss


def get_largest_product_of_n_digits(xs, n):
    return max([product(xs[i:i + n]) for i in range(len(xs))])


def euler_011():
    xss = get_lists_for_all_directions()
    return max([get_largest_product_of_n_digits(xs, 4) for xs in xss])


assert(euler_011() == 70600674)
print("e011.py: {}".format(euler_011()))