ruby

gistfile1.rb

class Person
	# Accessor and mutator methods
	attr_reader :position, :succ, :alive
	attr_writer :position, :succ, :alive

	# Initialize
	def initialize(pos)
		@position = pos
		@alive = true
	end
	# Stringify
	def to_s
		"Person \##@position, #{@alive ? 'alive' : 'dead'}"
	end
	# Create a linked chain of people.
	def createChain(n)
		return self unless n > 0
		@succ = Person.new(@position + 1)
		@succ.createChain(n-1)
	end
	# Kill every nth person. Stop killing if I'm the last one.
	def kill(pos,n,remaining)
		return @succ.kill(pos,n,remaining) if !@alive
		return self if (remaining == 1)

		if pos == n
			@alive = false
			pos = 0
			remaining -= 1
		end
		@succ.kill(pos+1,n,remaining)
	end
end