LeetCode 865 – Smallest Subtree of Deepest Nodes | DFS Approach (Java C++ Python JS) Solution 9 Jan

865. Smallest Subtree with All the Deepest Nodes | LeetCode Solution (Java / C++ / Python / JS)

In this video, we solve the LeetCode problem: “Smallest Subtree With All the Deepest Nodes”.
The goal is to return the smallest subtree that contains ALL the deepest nodes of the binary tree using an optimal DFS approach.

✔ We compute the depth of each subtree
✔ Return both (node, depth) from DFS
✔ Identify the node that is the Lowest Common Ancestor of deepest nodes
✔ Works in O(n) time

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Example:
Input: root = [3,5,1,6,2,0,8,null,null,7,4]
Output: [2,7,4]

Topics:
- DFS (Depth-First Search)
- Binary Tree
- Tree Depth Calculation
- Lowest Common Ancestor of Deepest Leaves

Constraints:
1 ≤ number of nodes ≤ 500

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💡 Similar Problems:
1123. Lowest Common Ancestor of Deepest Leaves
236. Lowest Common Ancestor of a Binary Tree

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📌 Companies Where This Problem Is Asked:
Facebook
Amazon
Salesforce
Meta

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🔗 Problem Link: https://leetcode.com/problems/smallest-subtree-with-all-the-deepest-nodes/description/?envType=daily-question&envId=2026-01-09

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🔗 Solution Code:
https://github.com/VirtualPrakhar/LeetCodeDaily/blob/main/2026/January/9Jan.txt
Java | C++ | Python | JavaScript (GitHub link in description)

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