Problem:Construct Binary Tree from Preorder and Inorder Traversal

Understand how to reconstruct a binary tree from given preorder and inorder traversal arrays by applying recursion and a hashmap for efficient element indexing. This lesson guides you through dividing the tree into subtrees, managing traversal pointers, and analyzing the time and space complexity of the solution.

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Statement
Examples
Try it yourself!
Solution
- Time complexity
- Space complexity

Statement

You are given two integer arrays, preorder and inorder, representing the preorder traversal and inorder traversal of the same binary tree, respectively. Your task is to reconstruct and return the binary tree from these two traversal sequences.

Note: All values in the tree are unique, and every value present in inorder is also present in preorder.

Constraints:

$1 \leq$ preorder.length $\leq 3000$
inorder.length $=$ preorder.length
$-3000 \leq$ preorder[i], inorder[i] $\leq 3000$ ...

1.Introduction to Data Structures and Algorithms

2.Algorithm Analysis and Complexity

3.Arrays

4.Linked Lists

5.Stack

6.Queue

7.Hash Tables

8.Recursion

9.Trees

10.Binary Search Trees

11.Heaps

12.Graphs

13.String Algorithms

14.Searching Algorithms

15.Sorting Algorithms

16.Conclusion

Problem:Construct Binary Tree from Preorder and Inorder Traversal

Statement