Tree top View doubt

#1

I’m not getting a clear idea to implement it and write its code

#2

Hey @anika203a do you want me to tell you an approach for the same? or do you want code of it?

#3

Can you tell me the approach and then share the implementation of the same

#4

Hey @anika203a here is the approach.
The idea is to create an empty map where each key represents the relative horizontal distance of the node from the root node and value in the map maintains a pair containing node’s value and its level number. Then we do a pre-order traversal of the tree and if current level of a node is less than maximum level seen so far for the same horizontal distance as current node’s or current horizontal distance is seen for the first time, we update the value and the level for current horizontal distance in the map. For each node, we recurse for its left subtree by decreasing horizontal distance and increasing level by 1 and recurse for right subtree by increasing both level and horizontal distance by 1.
tree
tree
Here’s the code for same

#5

Thank you so much !


It worked

#6

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