snake10.py

M = 10
N = 10


def printf(mat):
    global M, N

    for i in range(M):


        if i % 2 == 0:
            for j in range(N):
                print(str(mat[i][j]),
                      end=" ")

        else:
            for j in range(N - 1, -1, -1):
                print(str(mat[i][j]),
                      end=" ")



mat = [[0, 2, 3, 4, 5, 6, 7, 8, 9, 10],
       [20, 0, 18, 17, 16, 15, 14, 13, 12, 11],
       [21, 22, 0, 24, 25, 26, 27, 28, 29, 30],
       [40, 39, 38, 0, 36, 35, 34, 33, 32, 31],
       [41, 42, 43, 44, 0, 46, 47, 48, 49, 50],
       [60, 59, 58, 57, 56, 0, 54, 53, 52, 51],
       [61, 62, 63, 64, 65, 66, 0, 68, 69, 70],
       [80, 79, 78, 77, 76, 75, 74, 0, 72, 71],
       [81, 82, 83, 84, 85, 86, 87, 88, 0, 90],
       [100, 99, 98, 97, 96, 95, 94, 93, 92, 0]]

printf(mat)