Symmetric Tree | Mirror Tree | GfG POTD | GeeksforGeeks | C++ & Java Tutorial

🎯 Symmetric Tree | Mirror Tree | GeeksforGeeks POTD | C++ & Java Tutorial
Learn how to check if a binary tree is symmetric (mirror of itself) with a clean recursive solution!

🔑 Keywords: Symmetric Tree, Mirror Tree, Binary Tree, GfG POTD, GeeksforGeeks Symmetric Tree, Symmetric Tree Solution, Symmetric Tree C++ Java, Symmetric Tree Tutorial, Tree Recursion, LeetCode Symmetric Tree, Data Structures and Algorithms

🧾 Problem Statement
Given the root of a binary tree, determine if it is symmetric around its center (i.e., the left subtree is a mirror reflection of the right subtree). Return true if symmetric; otherwise, false.

📊 Example Inputs & Outputs
Input: [1, 2, 2, 3, 4, 4, 3] → Output: True
Input: [1, 2, 2, null, 3, null, 3] → Output: False

🧠 Core Concepts & Approach
Recursive Mirror Check
Define isMirror(node1, node2):
If both nodes are NULL → true
If one is NULL → false
Complexity Analysis
Time: O(N) — each node visited once
Space: O(H) — recursion stack (H = tree height)

🔍 Detailed Dry Run
Case 1: [1,2,2,3,4,4,3]
Compare roots’ children (2,2) → equal → recurse on (3,3) & (4,4) → all true → symmetric
Case 2: [1,2,2,null,3,null,3]
(2,2) equal → recurse on (null,3) → one side NULL → not symmetric

💻 Code Implementations
C++ → Inline comments for base cases, recursion, edge handling
Java → Mirror of the C++ logic, with null checks and helper method
  
⏱️ Video Chapters
00:00 – Introduction
00:12 – Problem Statement & Examples
01:20 – Intuition & Recursive Setup
02:33 – Dry Run Walkthrough
05:40 – Code

📂 Resources & Code

👨‍💻 What You’ll Learn
How to detect mirror structure in binary trees
Writing concise recursive functions in C++ & Java
Handling edge cases (NULL nodes, skewed trees)

👍 If this helped, Like, Comment your doubts, and Subscribe 🔔 to LeetGeek for more DSA tutorials!

🔖 Tags
#SymmetricTree #MirrorTree #BinaryTree #Recursion #GeeksforGeeks #GFGPOTD #DailyCodingChallenge #DSA #Cplusplus #Java #LeetGeek #InterviewPrep #AlgorithmExplained #CodingTutorial #100DaysOfCode #CleanCode #CodingChallenge #DataStructuresAndAlgorithms #TechEducation #LearnToCode #DeveloperCommunity #CodingDaily #AlgoExpert #BigOComplexity #IndiaTech #BuildInPublic