import solve, utils

def grow():
	N = get_world_size()
	apple = None
	path = 0
	length = 0

	def mv(x, y, d, irq=False):
		global apple
		global path
		global length
		
		move(d)
		path += 1
		if (x, y) == apple:
			apple = measure()
			length += 1
		return irq and path >= length

	def goto(tx, ty, irq=False):
		if irq and path >= length:
			return

		x, y = get_pos_x(), get_pos_y()

		for i in range(max(0, tx-x)):
			x += 1
			if mv(x, y, East, irq):
				return
		for i in range(max(0, x-tx)):
			x -= 1
			if mv(x, y, West, irq):
				return

		for i in range(max(0, ty-y)):
			y += 1
			if mv(x, y, North, irq):
				return
		for i in range(max(0, y-ty)):
			y -= 1
			if mv(x, y, South, irq):
				return


	def init():
		global apple
		global length

		change_hat(Hats.Gray_Hat)
		utils.mv(0, 0)
		change_hat(Hats.Dinosaur_Hat)

		apple = measure()
		path = 0
		length = 1

	def run():
		global apple
		global path

		if apple == None or length == N*N:
			init()
			return

		path = 0
		for x in range(N):
			if x%2 == 0:
				goto(x, 1, True)
				goto(x, N-1, True)
			else:
				goto(x, N-1, True)
				goto(x, 1, True)

		x, y = apple
		if within((x, y), (0, N-1, 1, N)):
			goto(x, y)

		goto(N-1, 1)
		goto(N-1, 0)
		goto(0, 0)

		x, y = apple

	return (init, run)

def growlong():
	N = get_world_size()

	def init():
		change_hat(Hats.Gray_Hat)
		utils.mv(0, 0)
		change_hat(Hats.Dinosaur_Hat)

	def run():
		for i in range(N):
			if i%2 == 0:
				if not utils.mv(i, 1):
					init()
					return
				if not utils.mv(i, N-1):
					init()
					return
			else:
				if not utils.mv(i, N-1):
					init()
					return
				if not utils.mv(i, 1):
					init()
					return
		if not utils.mv(N-1, 0):
			init()
			return
		if not utils.mv(0, 0):
			init()
			return

	return (init, run)

def check():
	def init():
		pass

	def run():
		if num_items(Items.Bone) >= 33488928:
			return True

	return (init, run)

if __name__ == '__main__':
	set_world_size(2)
	solve.run([
		growlong(),
		# check(),
	])()