Merge pull request #157 from Ratna04priya/master

Added Tree Data Structure including the identical tree finding and basic structure of tree.

Data_Structure/src/basic_structure_tree.py

@@ -0,0 +1,131 @@
+# This file contains the basic structure of tree
+
+import sys
+from tree_utils import *
+
+
+# Finding maximum element in a binary tree
+def find_max(root):
+	max_val = -sys.maxint -1
+	if root:
+		root_val = root.data
+		left_val = find_max(root.left)
+		right_val = find_max(root.right)
+		if left_val > right_val:
+			max_val = left_val
+		else:
+			max_val = right_val
+		if max_val < root_val:
+			max_val = root_val
+	return max_val
+
+
+# Finding an element in Binary Tree
+def find_element(root, data):
+	if root:
+		if root.data == data:
+			return 1
+		else:
+			temp = find_element(root.left, data)
+			if temp != 0:
+				return temp
+			else:
+				return find_element(root.right, data)
+	return 0
+
+
+# Finding size of tree : Number of nodes in tree
+def size_of_tree(root):
+	if not root:
+		return 0
+	else:
+		left_size = size_of_tree(root.left)
+		right_size = size_of_tree(root.right)
+		return left_size + 1 + right_size
+
+
+# Printing level order data in reverse order : 1 2 3 4 5 6 7 -> 4 5 6 7 2 3 1
+def reverse_level_order(root):
+	level_queue = list()
+	level_stack = list()
+	level_queue.append(root)
+	while level_queue:
+		curr_node = level_queue.pop(0)
+		if curr_node.right:
+			level_queue.append(curr_node.right)
+		if curr_node.left:
+			level_queue.append(curr_node.left)
+		level_stack.append(curr_node)
+	while level_stack:
+		curr_node = level_stack.pop()
+		print curr_node.data,
+
+
+# LeftView of Tree
+def left_view_of_tree(root):
+	if root:
+		print root.data
+		if root.left:
+			left_view_of_tree(root.left)
+		else:
+			left_view_of_tree(root.right)
+
+
+# Height of Tree
+def height_of_tree(root):
+	if not root:
+		return -1
+	else:
+		left_height = height_of_tree(root.left)
+		right_height = height_of_tree(root.right)
+		if left_height > right_height:
+			max_height = left_height + 1
+		else:
+			max_height = right_height + 1
+		return max_height
+
+
+# Bottom View of Tree
+def bottom_view(root):
+	if root:
+		bottom_view(root.left)
+		if not root.left and not root.right:
+			print root.data
+		bottom_view(root.right)
+
+
+# Leaf Node Count
+def get_leaf_node_count(root):
+	if not root:
+		return 0
+
+	if root.left is None and root.right is None:
+		return 1
+	else:
+		return get_leaf_node_count(root.left) + get_leaf_node_count(root.right)
+
+def test():
+	# l1 = TreeNode(4, None, None)
+	# l2 = TreeNode(5, None, None)
+	# l3 = TreeNode(6, None, None)
+	# l4 = TreeNode(7, None, None)
+	# l11 = TreeNode(2, l1, l2)
+	# l21 = TreeNode(3, l3, l4)
+	# root = TreeNode(1, l11, l21)
+
+	root = TreeNode(3)
+	root.left = TreeNode(2)
+	root.right = TreeNode(5)
+	root.left.left = TreeNode(1)
+	root.left.right = TreeNode(4)
+
+	# print "find_element:", find_element(root, 6)
+	# print "size_of_tree", size_of_tree(root)
+	# print "reverse_level_order: "
+	# reverse_level_order(root)
+	# print "left_view: "
+	# left_view_of_tree(root)
+	# print "height: "
+	# print height_of_tree(l1)
+	bottom_view(root)
+	print "Leaf:",get_leaf_node_count(root)

Data_Structure/src/identical_tree.py

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+#  to determine if two trees are identical
+
+from tree_utils import TreeNode
+
+
+def identical_trees(root1, root2):
+	if not root1 and not root2:
+		return True
+	if root1 and root2:
+		return (root1.data == root2.data) and \
+				identical_trees(root1.left, root2.left) and \
+				identical_trees(root1.right, root2.right)
+	return False
+
+
+def test():
+	root1 = TreeNode(1)
+	root2 = TreeNode(1)
+	root1.left = TreeNode(2)
+	root1.right = TreeNode(3)
+	root1.left.left = TreeNode(4)
+	root1.left.right = TreeNode(5)
+
+	root2.left = TreeNode(2)
+	root2.right = TreeNode(3)
+	root2.left.left = TreeNode(4)
+	root2.left.right = TreeNode(5)
+
+	if identical_trees(root1, root2):
+		print "Both trees are identical"
+	else:
+		print "Trees are not identical"