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26 lines
735 B
26 lines
735 B
# typed: false
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wire_paths = ARGF.read.lines.map {|l|
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l.split(?,).map {|i| [i[0], i[1..-1].to_i] }
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}
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wire_points = wire_paths.map {|path|
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path.each.with_object([[0, 0]]) {|(dir, length), points|
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x, y = points.last
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length.times {|i|
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points << case dir
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when ?R then [x+i+1, y]
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when ?U then [x, y+i+1]
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when ?L then [x-i-1, y]
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when ?D then [x, y-i-1]
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end
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}
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}.map.with_index.to_h
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}
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intersections = wire_points[0].select {|k, _| wire_points[1].has_key?(k) }
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intersections.delete([0, 0])
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# distances = intersections.map {|(x, y), _| x.abs + y.abs }
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distances = intersections.map {|p, d| d + wire_points[1].fetch(p) }
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puts distances.min
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