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DFS Preorder Visualizer & Solution | Rulcode

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13. DFS Preorder

Easy

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Visualize This Problem

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Example 1:

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

Output: [1, 2, 3]

Explanation: The preorder traversal visits the root (1), then the right subtree (2, 3) in that order.

Example 2:

Input: root = [1,2,3,4,5,null,8,null,null,6,7,9]

Output: [1,2,4,5,6,7,3,8,9]

Explanation: The preorder traversal visits the root, then the left subtree, and finally the right subtree.

Example 3:

Input: root = []

Output: []

Explanation: An empty tree results in an empty traversal.

Example 4:

Input: root = [1]

Output: [1]

Explanation: A single node tree simply returns the value of the root.

Constraints:

Time Complexity

O(n)

Space Complexity

O(h)

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rulcode

13. DFS Preorder

Easy

Topics

Hint

Understand Before Coding

Visualize This Problem

Open Visualizer

Draw Your Approach

Draw

Example 1:

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

Output: [1, 2, 3]

Explanation: The preorder traversal visits the root (1), then the right subtree (2, 3) in that order.

Example 2:

Input: root = [1,2,3,4,5,null,8,null,null,6,7,9]

Output: [1,2,4,5,6,7,3,8,9]

Explanation: The preorder traversal visits the root, then the left subtree, and finally the right subtree.

Example 3:

Input: root = []

Output: []

Explanation: An empty tree results in an empty traversal.

Example 4:

Input: root = [1]

Output: [1]

Explanation: A single node tree simply returns the value of the root.

Constraints:

Time Complexity

O(n)

Space Complexity

O(h)

13. DFS Preorder

Understand Before Coding

Visualize This Problem

Draw Your Approach

Example 1:

Example 2:

Example 3:

Example 4:

Constraints:

Learn

Topics

Hint

Use Cases

13. DFS Preorder

Understand Before Coding

Visualize This Problem

Draw Your Approach

Example 1:

Example 2:

Example 3:

Example 4:

Constraints:

Learn

Topics

Hint

Use Cases