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63 lines
1.2 KiB
63 lines
1.2 KiB
scan = ARGF.read.lines(chomp: true)
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cave = scan.each.with_object({}) {|line, cave|
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line.split(" -> ")
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.map { _1.split(?,).map(&:to_i) }
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.each_cons(2) {|(ax,ay),(bx,by)|
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Range.new(*[ax, bx].sort).each do |x|
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Range.new(*[ay, by].sort).each do |y|
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cave[[x, y]] = ?#
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end
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end
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}
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}
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x_min, x_max = cave.keys.map(&:first).minmax
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y_min, y_max = cave.keys.map(&:last).minmax
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inspect_cave = -> {
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puts (0..y_max+1).map {|y|
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(x_min-1..x_max+1).map {|x|
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cave[[x, y]] || ?.
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}.join
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}.join("\n")
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}
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# part one
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# sands = 0
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# loop do
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# inspect_cave.()
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# sands += 1
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# pos = [500, 0]
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# while next_pos = [0, -1, 1].map {|dx| pos.zip([dx, 1]).map { _1 + _2 }}.find { cave[_1].nil? }
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# pos = next_pos
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# break if pos[1] >= y_max
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# end
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# break if pos[1] >= y_max
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# cave[pos] = ?o
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# end
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# inspect_cave.()
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# p sands-1
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# part two
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cave.default_proc = ->(h,(x,y)) { h[[x, y]] = y == y_max + 2 ? ?# : nil }
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sands = 0
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loop do
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# inspect_cave.()
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sands += 1
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pos = [500, 0]
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while next_pos = [0, -1, 1].map {|dx| pos.zip([dx, 1]).map { _1 + _2 }}.find { cave[_1].nil? }
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pos = next_pos
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end
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break if pos == [500, 0]
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cave[pos] = ?o
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end
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inspect_cave.()
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p sands
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