from __future__ import absolute_import
from __future__ import division
from __future__ import print_function


class MaxPriorityQueue(object):
	"""Max Priority Queue."""
	def __init__(self):
		pass


def main():
	pass


if __name__ == '__main__':
	main()

@@ -104,16 +104,118 @@
 ction%0A%0A%0A
+def parent(i):%0A    return i // 2%0A%0Adef left(i):%0A    return 2 * i%0A%0Adef right(i):%0A    return 2 * i + 1%0A%0A%0A
 class Ma

Add parent(), left() & right()