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67 lines
1.0 KiB
67 lines
1.0 KiB
1 week ago
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input = DATA.read.split("\n\n")
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map = {}
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input.shift.split("\n").each.with_index do |row, y|
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row.chars.each.with_index do |pos, x|
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map[[y,x]] = pos unless pos == ?.
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end
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end
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robot = map.find { _2 == ?@ }.first
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bounds = [
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(0..map.keys.map(&:first).max),
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(0..map.keys.map(&:last).max),
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]
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map_s = ->() {
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bounds[0].map { |y|
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bounds[1].map { |x|
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map.fetch([y,x], ?.)
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}.join
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}.join("\n")
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}
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Nope = Class.new(Exception)
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def push(map, pos, move)
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delta = DELTAS.fetch(move)
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pospos = pos.zip(delta).map { _1 + _2 }
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case map.fetch(pospos, nil)
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when ?#
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raise Nope
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when ?O
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push(map, pospos, move)
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when nil
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else
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fail
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end
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map[pospos] = map.fetch(pos)
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map.delete(pos)
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pospos
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end
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DELTAS = %w[ ^ v < > ].zip([[-1,0], [1,0], [0,-1], [0, 1]]).to_h
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movements = input.shift.gsub("\n", "").chars
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movements.each do |move|
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begin
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robot = push(map, robot, move)
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rescue Nope
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end
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end
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pp map.select { _2 == ?O }.sum {|(y,x),_| 100 * y + x }
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__END__
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#######
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#...#.#
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#.....#
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#..OO@#
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#..O..#
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#.....#
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#######
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<vv<<^^<<^^
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