Top view of Binary Tree | Bottom view of Binary Tree | Binary Tree Data Structures Java | DSAOne #61

Hey guys, In this video, We're going to learn how to print the Top View and the Bottom View of a Binary Tree.

Practice here:

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[subhankarpal]

Now I can say my Nonlinear Data structure journey has been started with Anuj Bhaiya 🙏🙏🙏🙏🙏 Thank You Sir ❣❣❣❣.

[raghunath]

Nice solution.
But i found out a little bit optimization for the above solution.
Consider d= horizontal diameter of the tree.
Building Treemap takes o(dlogd).
Instead of TreeMap use HashMap and maintain two static variables i.e., min and max and update the min and max values as
min=Math.min(min, temp.hd);
max=Math.max(max, temp.hd);
for every iteration.
Now traverse the HM from min to max and add those values to a new ArrayList.
This will reduce the time complexity from O(n+dlogd) to O(n)

[abdullahirfan]

Never knew that this medium level topic is going to be so easy for me
Thank yoy

[Jitendrachouhan]

You are Such as Good Mentor 🥰 i really inspired your video when did I watch ❤

[udaychandu]

Very Clean and Neat Explaination, Sir!

[RepublicDay]

You are genious dude…!!! Applauses 👌👌👌

[ANJALIGUPTA-vqcv]

awesome bhaiya, thanks for making coding easier

[hangover.]

for implementing the queue method we can define three variables in class third one to store level and in the if condition we will check using or operator that if the level of incoming node is lesser than the already existing node it will replace the node. Please tell me if something is wrong with this approach . Open to other suggestions.

[prashantkumarsingh-uiyp]

, vertical order, top view, bottom view, what an explanation ☺☺☺

[MindsetMotivation]

Thank you bhaiya, best explanation ever.

[tech_wizard]

Can you please provide a 60roamdap of important topics for DSA beginner to crack tech giant's like Microsoft linkedin etc

[harshvardhansingh]

Thank you so much bhaiya mai yhi same glti kar rha tha.... thank you

[abhishekanuj]

Few days ago, bhaiya you suggested a youtube channel for learning java from scratch (u told, u also learnt from there) please give that channel link again, I forget that channel name. 🙏🏻

[ImranKhan-mcvf]

Not sure if it is the correct logic for bottom view.
Consider this example.
7(0)
/ \
6 (-1) 2 (1)
/ \ / \
5 ( -2 ) 1(0) 8(0) 2 (2)

We have 2 0s at bottom, but the map would hold just 1 zero. So your logic would give -> 5, 8, 2 instead of 5, 1, 8, 2.

Or am I missing something?

[sumitchakraborty]

what is the time complexity of this solution

[mohakarora]

can somebody tell me why are we using level order only?

[shivamchaurasiya]

Bhaiyaa DevOps par ek video banaiye isme career kaise banaye

[wizardiors]

did u have a computer science degree??

[harishlodha]

Sir background video recorder app se user Jo video record karta hai kya vo video app Wale ke pass bhi store hota hai kya
Kya ye possible hai ki Jo video hum record karte hain vo app Wale ke pass bhi store hota hai kya

[shaileshtiwari]

why we don't take preorder traversal for bottom view, kindly give a tree example where preorder traversal gives wrong answer.