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Grokking the Coding Interview Patterns in Python

Symmetric Tree

Explore how to identify symmetric binary trees by applying breadth-first search traversal. Learn to verify mirror-like tree structures and implement solutions efficiently in code.

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Statement

Given the root of a binary tree, check whether it is a symmetric tree. A symmetric tree refers to a tree that is a mirror of itself, i.e., symmetric around its root.

Constraints:

  • The tree contains nodes in the range [1,500][1, 500].
  • −103≤-10^3 \le Node.data ≤103\le 10^3

Examples

Understand the problem

Let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:

Symmetric Tree

1.

What will be the output if the following tree is given as input?

tree = [25, 4, 67, 2, 3, 3, 2]

          __ 25 __ 
         |        |
       _ 4 _    _ 67 _ 
      |     |  |      |
      2     3  3      2
A.

TRUE

B.

FALSE

1 / 3

Figure it out!

We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Sequence - Vertical
Drag and drop the cards to rearrange them in the correct sequence.
1
2
3
4
5
6
7

Try it yourself

Implement your solution in the following coding playground.

Python
usercode > main.py
# Definition for a binary tree node

# class TreeNode:

#     def __init__(self, data):

#         self.data = data

#         self.left = None

#         self.right = None



from ds_v1.BinaryTree.BinaryTree import TreeNode





def is_symmetric(root):



  # Replace this placeholder return statement with your code

  return False
Symmetric Tree