First clear solution for Cipher Map by juestr - python coding challenges

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First solution in Clear category for Cipher Map by juestr

_rotation90 = [3, 7, 11, 15,  2, 6, 10, 14,  1, 5, 9, 13,  0, 4, 8, 12]
rot90 = lambda idxs: sorted(_rotation90[i] for i in idxs)

def recall_password(grille, ciphertext):
    ciphertext = ''.join(ciphertext)
    grilleidxs = [idx for idx, x in enumerate(''.join(grille)) if x == 'X']
    blockidxs = grilleidxs + (i:=rot90(grilleidxs)) + (i:=rot90(i)) + rot90(i)
    return ''.join(ciphertext[i] for i in blockidxs)

Dec. 19, 2021

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