Count Good Nodes in Binary Tree | Leetcode 1448 Explained Simply (DFS + Preorder) | NeetCode 150

Count Good Nodes in Binary Tree Leetcode 1448 Solution | DFS Preorder Traversal | NeetCode 150

In this video, we solve Leetcode 1448: Count Good Nodes in Binary Tree with a simple and beginner-friendly explanation.

We’ll understand why preorder traversal is the right approach, visualize recursion through drawings, and break down the optimal DFS solution step by step in C++.

If you're preparing for coding interviews, solving NeetCode 150, or strengthening your binary tree recursion concepts, this video will help.

⏱️ Timestamps:
00:00 - Problem Understanding
01:58 - Why We Use Preorder Instead of Level Order
02:24 - Drawing Explanation
04:00 - Code Explanation
06:31 - Time & Space Complexity
07:20 - Common Interview Doubts
08:13 - Why Space Complexity is O(log N)?
09:42 - Preorder vs Postorder Clarification

This is an important binary tree interview problem frequently asked in coding interviews.

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Видео Count Good Nodes in Binary Tree | Leetcode 1448 Explained Simply (DFS + Preorder) | NeetCode 150 канала Ghost Codes