Given a tree, print the level order traversal in sorted order.
Input : 7 / \ 6 5 / \ / \ 4 3 2 1 Output : 7 5 6 1 2 3 4 Input : 7 / \ 16 1 / \ 4 13 Output : 7 1 16 4 13
We have discussed a priority queue based solution in below post.
In this post, a set (which is implemented using balanced binary search tree) based solution is discussed.
1. Start level order traversal of tree.
2. Store all the nodes in a set(or any other similar data structures).
3. Print elements of set.
# Python3 program to pr level order
# traversal in sorted order
# Helper function that allocates a new
# node with the given data and None
# left and right poers.
# Construct to create a new node
def __init__(self, key):
self.data = key
self.left = None
self.right = None
# Function to pr sorted
# level order traversal
def sorted_level_order( root):
q = 
s = set()
tmp = q
if (tmp == None):
if (not len(s)):
for i in s:
print(i, end = ” “)
s = set()
if (tmp.left != None):
if (tmp.right != None):
# Driver Code
if __name__ == ‘__main__’:
Let us create Binary Tree shown
in above example “””
root = newNode(7)
root.left = newNode(6)
root.right = newNode(5)
root.left.left = newNode(4)
root.left.right = newNode(3)
root.right.left = newNode(2)
root.right.right = newNode(1)
# This code is contributed by
# Shubham Singh(SHUBHAMSINGH10)
7 5 6 1 2 3 4
- Print Binary Tree levels in sorted order
- Print Binary Tree levels in sorted order | Set 3 (Tree given as array)
- Print even positioned nodes of even levels in level order of the given binary tree
- Print all nodes between two given levels in Binary Tree
- Print Levels of all nodes in a Binary Tree
- Print a Binary Tree in Vertical Order | Set 3 (Using Level Order Traversal)
- Print a Binary Tree in Vertical Order | Set 1
- Print a Binary Tree in Vertical Order | Set 2 (Map based Method)
- Print extreme nodes of each level of Binary Tree in alternate order
- Recursive Program to Print extreme nodes of each level of Binary Tree in alternate order
- Print the nodes at odd levels of a tree
- Averages of Levels in Binary Tree
- Maximum sum of non-leaf nodes among all levels of the given binary tree
- Maximum sum of leaf nodes among all levels of the given binary tree
- Reverse alternate levels of a perfect binary tree
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Improved By : SHUBHAMSINGH10