1110. Delete Nodes And Return Forest || LeetCode POTD || Explained in HINDI

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Approach:
Use Depth-First Search (DFS):
Perform a DFS traversal of the tree to handle the deletion process. Keep track of nodes to be deleted using a set for quick lookup.
Handle Node Deletion:
During the DFS traversal, if a node needs to be deleted, ensure its children are considered as new roots if they are not deleted themselves.
Maintain a list to store the roots of the remaining trees.
Construct the Result:
Initialize the traversal from the root, treating it as a potential new root if it is not deleted. Recursively apply the deletion process.
Time and Space Complexity:
Time Complexity:
The DFS traversal visits each node exactly once, resulting in a time complexity of O(n), where n is the number of nodes in the tree.
Space Complexity:
The space complexity is O(n) due to the recursion stack during the DFS traversal and the storage for the set of nodes to be deleted.
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[@reelcoding]

Code link:- leetcode.com/problems/delete-nodes-and-return-forest/solutions/5489890/java-solution-explained-in-hindi/

[@devissrani1076]

Suppose i did post order traversal and upon checking every node if it's value matches any value in to_delete and I EQUATED THAT NODE TO NULL and stored its left and right into list . Why this doesn't work .........

[@reelcoding]

Equating a node to null in a post-order traversal won’t work correctly because you lose reference to its left and right children once you set the node to null.

[@reelcoding]

1.Loss of Reference:When you set a node to null, you lose the ability to access its left and right children. This is because the node itself is the reference to its children. Setting it to null means you can no longer traverse from that node to its children.
2.Incorrect Tree Structure:If you set a node to null, the tree structure becomes invalid at that point. The parent node will still hold a reference to the node you set to null, which breaks the link in the tree hierarchy.
3.Invalid Updates: During the traversal, if you try to access children of a node that has been set to null, it will lead to null pointer exceptions. The tree needs to maintain proper references between parent and child nodes to traverse correctly.