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actions = ARGF.read.scan(/(\w)(\d+)/).map {|a,v| [a, v.to_i] }
dir = 0
pos = [0, 0]
way = [10, 1]
actions.each do |a,v|
# delta = case a
# when ?N
# [ 0, v]
# when ?S
# [ 0, -v]
# when ?E
# [ v, 0]
# when ?W
# [-v, 0]
# when ?L
# dir += v
# [0, 0]
# when ?R
# dir -= v
# [0, 0]
# when ?F
# rad = dir * Math::PI / 180.0
# [v * Math.cos(rad), v * Math.sin(rad)].map(&:round)
# else
# fail
# end
case a
when ?N
way[1] += v
when ?S
way[1] -= v
when ?E
way[0] += v
when ?W
way[0] -= v
when ?L
rad = Math.atan2(*way.reverse)
dis = Math.sqrt(way.map {|x| x**2 }.sum)
rad += v * Math::PI / 180
way = [dis * Math.cos(rad), dis * Math.sin(rad)].map(&:round)
when ?R
rad = Math.atan2(*way.reverse)
dis = Math.sqrt(way.map {|x| x**2 }.sum)
rad -= v * Math::PI / 180
way = [dis * Math.cos(rad), dis * Math.sin(rad)].map(&:round)
when ?F
delta = way.map {|i| v * i }
pos = pos.zip(delta).map {|a,b| a + b }
else
fail
end
end
p pos.map(&:abs).sum