Day 26: Construct Binary Tree from Preorder & Inorder (LeetCode 105) — Amazon Interview Question! 🚀 скачать в хорошем качестве

Day 26: Construct Binary Tree from Preorder & Inorder (LeetCode 105) — Amazon Interview Question! 🚀

🎯 Day 26 of My LeetCode Journey | Construct Binary Tree from Preorder and Inorder Traversal (LeetCode 105) In this video, I solve LeetCode Problem #105 — Construct Binary Tree from Preorder and Inorder Traversal using JavaScript! This is a frequently asked Amazon interview question 🚨 that tests your understanding of tree traversals and recursive tree construction. 🔗 Problem Link: https://leetcode.com/problems/constru... 📌 PROBLEM SUMMARY: Given two integer arrays preorder and inorder where: preorder is the preorder traversal of a binary tree inorder is the inorder traversal of the same tree Construct and return the binary tree. ✅ Example 1: Input: preorder = [3,9,20,15,7], inorder = [9,3,15,20,7] Output: [3,9,20,null,null,15,7] ✅ Example 2: Input: preorder = [-1], inorder = [-1] Output: [-1] 💡 KEY CONCEPTS: ✅ Preorder Traversal (Root → Left → Right): First element is always root ✅ Inorder Traversal (Left → Root → Right): Elements before root are in left subtree ✅ HashMap for fast index lookup ✅ Recursive tree construction ✅ Divide and conquer strategy 📊 COMPLEXITY: • Time: O(n) - visit each node once • Space: O(n) - recursion stack 🎓 DIFFICULTY: Medium 🏷️ TOPICS: Array, Divide and Conquer, Tree, Binary Tree 🏢 ASKED AT: Amazon, Microsoft, Facebook, Bloomberg 🔥 WHY THIS MATTERS: This is a classic tree reconstruction problem that appears in Amazon interviews frequently. Understanding how preorder and inorder traversals work together is crucial for many tree-related problems! 💻 JAVASCRIPT SOLUTION: I'll walk you through the complete JavaScript implementation with detailed explanations! 🔔 SUBSCRIBE for daily LeetCode solutions in JavaScript! 👍 LIKE if this helped you prepare for interviews! 💬 COMMENT your approach or questions below! 📚 MY LEETCODE JOURNEY PLAYLIST:    • Leetcode   🤝 CONNECT WITH ME: • GitHub: https://github.com/ashwinikemshetty • LinkedIn:   / ashwinikemshetty   #LeetCode #ConstructBinaryTree #LeetCode105 #Day26 #JavaScript #AmazonInterview #TreeTraversal #PreorderInorder #CodingInterview #DSA #Algorithms #100DaysOfCode #100DaysChallenge