Today brought another breather puzzle. You’re given a series of matrices like this:
#.##..##.
..#.##.#.
##......#
##......#
..#.##.#.
..##..##.
#.#.##.#.
#...##..#
#....#..#
..##..###
#####.##.
#####.##.
..##..###
#....#..#You have to find the vertical and horizontal line of symmetry in each. In the first example above, the vertical line is after the fourth column. Part two adds the twist that each matrix has a hidden line of symmetry, one that holds if just one element is altered. This is easy to compute by converting the character matrices to numeric, adding the reflected elements and checking if the sum is one.