Find Elements in a Contaminated Binary Tree | BFS | DFS | Leetcode 1261 | codestorywithMIK
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Hi Everyone, this is the 55th video of our Playlist "Binary Tree : Popular Interview Problems".
Now we will be solving a good String problem - Find Elements in a Contaminated Binary Tree | BFS | DFS | Leetcode 1261 | codestorywithMIK
Problem Name : Find Elements in a Contaminated Binary Tree | BFS | DFS | Leetcode 1261 | codestorywithMIK
Company Tags : Will update later
My solutions on Github(C++ & JAVA) - https://github.com/MAZHARMIK/Interview_DS_Algo/blob/master/Tree/Find Elements in a Contaminated Binary Tree.cpp
Leetcode Link : https://leetcode.com/problems/find-elements-in-a-contaminated-binary-tree
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Video Summary :
DFS Approach:
Start from the root (value 0) and recursively assign values to its children using 2*x + 1 and 2*x + 2.
Store all values in a HashSet for quick lookups.
This ensures a complete reconstruction of the tree using a depth-first manner.
BFS Approach:
Use a queue to process nodes level by level, assigning values iteratively.
Each node’s children get their values and are pushed into the queue.
Like DFS, a HashSet is used for O(1) lookups, but BFS avoids deep recursion issues. 🚀
✨ Timelines✨
00:00 - Introduction
00:16 - Problem Explanation
03:06 - Thought Process
12:29 - Time & Space Complexity
08:55 - Coding DFS
10:28 - Coding BFS
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