Binary Tree Preorder Traversal LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct]

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Hello Programmers/Coders, Today we are going to share solutions to the Programming problems of LeetCode Solutions in C++, Java, & Python. At Each Problem with Successful submission with all Test Cases Passed, you will get a score or marks and LeetCode Coins. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.

In this post, you will find the solution for the Binary Tree Preorder Traversal in C++, Java & Python-LeetCode problem. We are providing the correct and tested solutions to coding problems present on LeetCode. If you are not able to solve any problem, then you can take help from our Blog/website.

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LeetCode is one of the most well-known online judge platforms to help you enhance your skills, expand your knowledge and prepare for technical interviews. 

LeetCode is for software engineers who are looking to practice technical questions and advance their skills. Mastering the questions in each level on LeetCode is a good way to prepare for technical interviews and keep your skills sharp. They also have a repository of solutions with the reasoning behind each step.

LeetCode has over 1,900 questions for you to practice, covering many different programming concepts. Every coding problem has a classification of either Easy, Medium, or Hard.

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  • Trees & Graphs
  • Greedy Algorithms
  • Breadth-First Search
  • Depth-First Search
  • Sorting & Searching
  • BST (Binary Search Tree)
  • Database
  • Linked List
  • Recursion, etc.

Leetcode has a huge number of test cases and questions from interviews too like Google, Amazon, Microsoft, Facebook, Adobe, Oracle, Linkedin, Goldman Sachs, etc. LeetCode helps you in getting a job in Top MNCs. To crack FAANG Companies, LeetCode problems can help you in building your logic.

Link for the Problem – Binary Tree Preorder Traversal– LeetCode Problem 

Binary Tree Preorder Traversal– LeetCode Problem

Problem:

Given the root of a binary tree, return the preorder traversal of its nodes’ values.

Example 1:

inorder 1
Input: root = [1,null,2,3]
Output: [1,2,3]

Example 2:

Input: root = []
Output: []

Example 3:

Input: root = [1]
Output: [1]

Constraints:

  • The number of nodes in the tree is in the range [0, 100].
  • -100 <= Node.val <= 100
Binary Tree Preorder Traversal– LeetCode Solutions
Binary Tree Preorder Traversal Solution in C++:
class Solution {
 public:
  vector<int> preorderTraversal(TreeNode* root) {
    if (!root)
      return {};

    vector<int> ans;
    stack<TreeNode*> stack{{root}};

    while (!stack.empty()) {
      root = stack.top(), stack.pop();
      ans.push_back(root->val);
      if (root->right)
        stack.push(root->right);
      if (root->left)
        stack.push(root->left);
    }

    return ans;
  }
};
Binary Tree Preorder Traversal  Solution in Java:
class Solution {
  public List<Integer> preorderTraversal(TreeNode root) {
    if (root == null)
      return new ArrayList<>();

    List<Integer> ans = new ArrayList<>();
    Stack<TreeNode> stack = new Stack<>();
    stack.push(root);

    while (!stack.isEmpty()) {
      root = stack.pop();
      ans.add(root.val);
      if (root.right != null)
        stack.push(root.right);
      if (root.left != null)
        stack.push(root.left);
    }

    return ans;
  }
}
Binary Tree Preorder Traversal Solution in Python:
class Solution:
  def preorderTraversal(self, root: Optional[TreeNode]) -> List[int]:
    if not root:
      return []

    ans = []
    stack = [root]

    while stack:
      node = stack.pop()
      ans.append(node.val)
      if node.right:
        stack.append(node.right)
      if node.left:
        stack.append(node.left)

    return ans

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