Find Minimum Diameter After Merging Two Trees | Leetcode 3203 | Graph Concepts & Qns - 45 | MIK

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Hi Everyone, this is the 45th video of our Playlist "Graph Concepts & Qns".
In Video-44, we already studied how to find the Diameter Of An Undirected Graph/Tree. We will use the same concept to solve this problem.
Video-44 Link - Diameter Of Undirected Graph | Tree Diameter | Leetcode 1245 -    • Diameter Of Undirected Graph | Tree D...  

Problem Name : Find Minimum Diameter After Merging Two Trees | Leetcode 3203 | Graph Concepts & Qns - 45 | Explanation + Code
Company Tags : Will update later
My solutions on Github(C++ & JAVA) - https://github.com/MAZHARMIK/Intervie...
Leetcode Link : https://leetcode.com/problems/find-mi...



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Video Summary :
To calculate the minimum diameter after merging two trees, the approach involves:

Building the Adjacency List:
Construct the adjacency list for both trees using the given edges, stored in a Map.

Calculating Tree Diameters:
Use a two-step BFS approach to calculate the diameter of each tree:

First BFS finds the farthest node from any arbitrary node (e.g., node 0).
Second BFS from the farthest node gives the tree's diameter.
Merging the Trees:
The combined diameter is computed as (d1 + 1) / 2 + (d2 + 1) / 2 + 1.

Result:
The final result is the maximum of the three values: the diameter of tree 1, tree 2, and the combined diameter.


✨ Timelines✨
00:00 - Introduction
0:38 - Motivation
1:12 - Problem Explanation
3:39 - Thought Process
14:44 - Corner Case
19:40 - Coding it up


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