year12-fast.7bh

-- 7 Billion Humans (2215) --
-- 12: Unzip --

-- INSTRUCTIONS: "Move the left most data cube one tile up. Move the
-- next data cube one tile down. Next up. Next down. And so on, like
-- unzipping a zipper."

-- AVAILABLE COMMANDS: step, pickUp, drop, if, jump, comment

-- SIZE: 12 commands (challenge 8, shortest known 8)
-- BEST AVERAGE RUNTIME: 4 seconds (challenge 7, fastest known 4)


pickup c
if w != worker:
	-- Westernmost worker, adjacent to the wall.
	step n
else:
	-- Once the westernmost worker moves, the workers at the ends of
	-- the line step in the same direction. Alternate between
	-- stepping north and south.
	a:
	if e != worker or
	 w != worker:
		step s
	else:
		if e != worker or
		 w != worker:
			step n
		else:
			jump a
		endif
	endif
endif
drop


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