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-rwxr-xr-xday03/part237
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+#!/usr/bin/env ruby
+
+input = $stdin.readlines.map(&:strip).map{|x|x.split(",")}
+
+def map_wire(wire_segments)
+ wire = []
+ x = 0
+ y = 0
+ wire_segments.each do |seg|
+ dir = seg[0]
+ len = seg[1..-1].to_i
+ len.times do
+ case dir
+ when "R"
+ x += 1
+ when "L"
+ x -= 1
+ when "U"
+ y += 1
+ when "D"
+ y -= 1
+ end
+ wire << [x, y]
+ end
+ end
+ wire
+end
+
+wire1 = map_wire(input[0])
+wire2 = map_wire(input[1])
+
+intersections = (wire1 & wire2) - [0,0]
+steps = intersections.map do |i|
+ wire1.index(i) + wire2.index(i) + 2
+end
+
+puts steps.min