You are given the preorder and inorder traversals of a binary tree of integers that contains no duplicates. Using this information, reconstruct the binary tree and draw it. Inorder: [4, 9, 7, 3, 1, 5, 2, 6, 8, 0] Preorder: [1, 7, 4, 9, 3, 2, 5, 8, 6, 0]

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Chapter1: Introduction
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**Binary Tree Construction from Traversals**

**Problem Statement:**
You are given the preorder and inorder traversals of a binary tree of integers that contain no duplicates. Using this information, reconstruct the binary tree and draw it.

**Inorder Traversal:** [4, 9, 7, 3, 1, 5, 2, 6, 8, 0]

**Preorder Traversal:** [1, 7, 4, 9, 3, 2, 5, 8, 6, 0]

**Explanation:**

1. **Understanding Traversals:**
   - **Inorder Traversal** lists the nodes as they appear from left to right.
   - **Preorder Traversal** begins with the root and then lists nodes from left to right.

2. **Reconstruction Steps:**
   - Use the first element of the preorder list as the root (1 in this case).
   - Locate the root in the inorder list to divide it into left and right subtrees.

3. **Detailed Steps:**
   - **Root Node:** The first element of the preorder traversal is 1.
   - **Left Subtree:** Based on the inorder list, elements left of 1 are [4, 9, 7, 3].
   - **Right Subtree:** Elements right of 1 in the inorder list are [5, 2, 6, 8, 0].

4. **Continuing Recursively:**
   - For the left subtree, use the next element in preorder (7) to find its position in the inorder list [4, 9, 7, 3] and repeat.
   - For the right subtree, continue using the preorder sequence starting immediately after elements allocated to the left subtree.

5. **Drawing the Tree:**
   - Use the above logic to iteratively divide and assign elements to build the tree from root, then left to right.

**Result:**
A binary tree constructed using the provided preorder and inorder traversals, achieving a balanced structure as defined by the traversal orders.
Transcribed Image Text:**Binary Tree Construction from Traversals** **Problem Statement:** You are given the preorder and inorder traversals of a binary tree of integers that contain no duplicates. Using this information, reconstruct the binary tree and draw it. **Inorder Traversal:** [4, 9, 7, 3, 1, 5, 2, 6, 8, 0] **Preorder Traversal:** [1, 7, 4, 9, 3, 2, 5, 8, 6, 0] **Explanation:** 1. **Understanding Traversals:** - **Inorder Traversal** lists the nodes as they appear from left to right. - **Preorder Traversal** begins with the root and then lists nodes from left to right. 2. **Reconstruction Steps:** - Use the first element of the preorder list as the root (1 in this case). - Locate the root in the inorder list to divide it into left and right subtrees. 3. **Detailed Steps:** - **Root Node:** The first element of the preorder traversal is 1. - **Left Subtree:** Based on the inorder list, elements left of 1 are [4, 9, 7, 3]. - **Right Subtree:** Elements right of 1 in the inorder list are [5, 2, 6, 8, 0]. 4. **Continuing Recursively:** - For the left subtree, use the next element in preorder (7) to find its position in the inorder list [4, 9, 7, 3] and repeat. - For the right subtree, continue using the preorder sequence starting immediately after elements allocated to the left subtree. 5. **Drawing the Tree:** - Use the above logic to iteratively divide and assign elements to build the tree from root, then left to right. **Result:** A binary tree constructed using the provided preorder and inorder traversals, achieving a balanced structure as defined by the traversal orders.
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