Skip to content
Programming101
Programmingoneonone

Learn everything about programming

  • Home
  • CS Subjects
    • IoT – Internet of Things
    • Digital Communication
    • Human Values
  • Programming Tutorials
    • C Programming
    • Data structures and Algorithms
    • 100+ Java Programs
    • 100+ C Programs
  • HackerRank Solutions
    • HackerRank Algorithms Solutions
    • HackerRank C problems solutions
    • HackerRank C++ problems solutions
    • HackerRank Java problems solutions
    • HackerRank Python problems solutions
Programming101
Programmingoneonone

Learn everything about programming

Leetcode Symmetric Tree problem solution

YASH PAL, 31 July 2024

In this Leetcode Symmetric Tree problem solution we have Given the root of a binary tree, check whether it is a mirror of itself.

Leetcode Symmetric Tree problem solution

Topics we are covering

Toggle
  • Problem solution in Python.
  • Problem solution in Java.
  • Problem solution in C++.
  • Problem solution in C.

Problem solution in Python.

class Solution:
    def isSymmetric(self, root: TreeNode) -> bool:
        if root is None:
            return True
        stack = [(root, root)]
        
        while stack: 
            node1, node2 = stack.pop()
            if node1 is None and node2 is None:
                pass
            elif node1 is None or node2 is None:
                return False
            elif node1.val != node2.val:
                return False
            else:    
                stack.append((node1.left, node2.right))
                stack.append((node1.right, node2.left))
            
        return True

Problem solution in Java.

class Solution
{
	public boolean isSymmetric(TreeNode root) 
	{
		Queue<TreeNode> q = new LinkedList<>();
		q.add(root);
		q.add(root);

		while(!q.isEmpty()) 
		{
			TreeNode t1 = q.poll();
			TreeNode t2 = q.poll();

			if (t1 == null && t2 == null) 
				continue;
			
			if (t1 == null || t2 == null || t1.val != t2.val)
				return false;
			
			q.add(t1.left);
			q.add(t2.right);
			q.add(t1.right);
			q.add(t2.left);
		}
		return true;
	}
}

Problem solution in C++.

class Solution {
public:

bool sameTree(TreeNode* lr,TreeNode* rr){
    
    if(!lr && !rr)
        return true;
    
    if(!lr || !rr)
        return false;
    
    if(lr->val != rr->val)
        return false;
    
    return sameTree(lr->left,rr->right) && sameTree(lr->right,rr->left);
}

bool isSymmetric(TreeNode* root) {
    if(root == nullptr)
        return true;
    
    return sameTree(root->left,root->right);
}
};

Problem solution in C.

bool dfs(struct TreeNode *root1, struct TreeNode* root2) {
    if(root1 == NULL && root2 == NULL) {
        return true;
    }
    
    if(root1 && root2) {
        if(root1->val == root2->val) {
            return (dfs(root1->left, root2->right) && dfs(root1->right, root2->left));
        }
    }
    
    return false;
}

bool isSymmetric(struct TreeNode* root){
    return dfs(root, root);
}

coding problems solutions

Post navigation

Previous post
Next post
  • Automating Image Format Conversion with Python: A Complete Guide
  • HackerRank Separate the Numbers solution
  • How AI Is Revolutionizing Personalized Learning in Schools
  • GTA 5 is the Game of the Year for 2024 and 2025
  • Hackerrank Day 5 loops 30 days of code solution
How to download udemy paid courses for free

Pages

  • About US
  • Contact US
  • Privacy Policy

Programing Practice

  • C Programs
  • java Programs

HackerRank Solutions

  • C
  • C++
  • Java
  • Python
  • Algorithm

Other

  • Leetcode Solutions
  • Interview Preparation

Programming Tutorials

  • DSA
  • C

CS Subjects

  • Digital Communication
  • Human Values
  • Internet Of Things
  • YouTube
  • LinkedIn
  • Facebook
  • Pinterest
  • Instagram
©2025 Programmingoneonone | WordPress Theme by SuperbThemes