Binary Tree Bootcamp: Full, Complete, & Perfect Trees. Preorder, Inorder, & Postorder Traversal.

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Full Binary Tree: Every node (besides children) has exactly 2 children (the maximum children a node can have in a binary tree).
Complete Binary Tree: Every level, except possibly the last, is completely filled, and all nodes are as far left as possible.
Perfect Binary Tree: All interior nodes have two children and all leaves have the same depth or same level. Perfect binary trees are both full and complete.
Preorder Traversal: node left right
Inorder Traversal: left node right
Postorder Traversal: left right node
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[@BackToBackSWE]

Table of Contents: A Quick Message 0:00 - 0:31 What We Are Going To Do 0:31 - 0:52 Full Binary Trees 0:52 - 1:38 Complete Binary Trees 1:38 - 2:14 Perfect Binary Trees 2:14 - 3:18 Let's Discuss The 2 Fundamental Traversals 3:18 - 3:42 How To Know Which Traversal Is Which 3:42 - 5:05 Think of Recursion Like This. 5:05 - 5:33 Preorder Traversal Walkthrough 5:33 - 11:15 Inorder Traversal Walkthrough 11:15 - 14:25 We Realize That This Is A Special Tree 14:25 - 15:07 Postorder Traversal Walkthrough 15:07 - 18:59 Briefly Addressing Time Complexity 18:59 - 19:22 Wrap Up 19:22 - 19:40 At 1:42 I meant that binary heaps are complete binary trees with the heap ordering property. Not that a complete binary tree is always a heap. The code for the traversals is in the description. All recursive and basically the same function. We will do iterative and O(1) space traversals soon.

[@2WARDEN2]

The ToC and video itself are perfect! The quality of information is phenomenal, I'm glad I kept digging for pre/in/post order examples until I found this! Thanks for taking the time to create this!

[@BackToBackSWE]

ye, for the internet yo

[@bonniwanamaker6296]

This guy is an amazing teacher.

[@BackToBackSWE]

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[@connerjensen8170]

Yeah for real I love his enthusiasm

[@SquidBeats]

Jesus Christ is God and is the only way. Hell is real whether you believe it or not

[@JossinJax]

Omg writing "lnr" at each node really clear this up for me. Thank you!

[@BackToBackSWE]

nice

[@oasishusband5260]

Ikr I loved that!

[@Parthsean]

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[@BackToBackSWE]

haha, what a statement

[@andrews2945]

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[@swimmingbyrd6283]

Showing these traversal with a "n" saved my lllliiiifffffeeee!!!!

[@BackToBackSWE]

yuh

[@Moitaytay]

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[@BackToBackSWE]

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Your reaction to the cutting and the stomping sounds cracked me up! Great content man! You just got yourself a subscriber.

[@MM-lo9tk]

I always assumed this was a super complicated topic and have been putting it off as long as possible. You just made it so simple and easy to understand. Thank you. I think I just found my new favorite channel!

[@MikeChaseJr]

This is amazing. One of the better CS videos. I love how you ask questions to test our understanding as we watch!

[@BackToBackSWE]

ye

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[@BackToBackSWE]

thanks - this guy

[@yannickwessidjam2036]

Wow! the best video I have ever seen!. I have been trying to understand this for so long. No one really explained it in a format that made sense to me. This makes so much sense!. Thank you !!!

[@crewelghoul]

I've been struggling with data structures and algorithms, and this really made things a lot clearer, thank you so much!

[@BackToBackSWE]

great and sure

[@gloriawang7493]

thank you for such a high-quality video. your explanation of "each node needs to execute the same policy" makes a ton of sense! never have i understood traversal so clearly until your video!

[@juliannafotheringham7101]

This is the most fantastic, clear video I have ever seen on DFS traversals, thank you so much my dear angel!

[@mattdoestechstuff]

This was really helpful. My university lecturer did a terrible job explaining this, but you managed to do it so succinctly and clear. Thank you!

[@birbx3r354]

I struggled with data structures and algorithms for 4 years. Watching your vids has helped me finally understand what's actually going on in layman's terms. Thank you so much for making these videos and keep it up!

[@BackToBackSWE]

ye, great

[@alexbowen3381]

Thank you so much for this video!! I'm an MIS major and a former CS major and after a so many CS courses a 20 minute video by you finally made me understand traversals! You are great at explaining these concepts and I look forward to binging more of your lessons as I brush up for some SWE interviews

[@BackToBackSWE]

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[@drodskate]

This is exactly what I needed! Thank you so much! You have no idea how hard the summer quarter has been with the lack of explanation.

[@BackToBackSWE]

nice - happy 4 u

[@backup2ramdisk]

WOW. Watched a bunch of videos by different people on traversals, everyone else just mumbles on and on "print this, skip this and print that" without explaining why, and you're THE ONLY ONE who actually explains the whole recursion thing in detail. THANK YOU SO MUCH!

[@mhaland2775]

I have looked at so many videos to understand this. This is the first video that made me understand it:) The recursive way of thinking was really helpful to understand this

[@BackToBackSWE]

thank you! Means a lot

[@haylydo8376]

I never comment on videos I see, but this one has to be the exception, because this is by far the best video I have seen on this topic. It cleared up so much confusion, and gave me tools to use along the way. Thank you!

[@BackToBackSWE]

Nice to hear. Thanks and sure

[@iulia6707]

this helped me a bunch for my collage exam, thank you!

[@dennisdouglas5941]

Honestly, You did a wonderful job explaining this content! It was fun, easy to follow and understand! 5 Stars! I did watch all of it, and I shall continue too watch all your videos! You rocked it!

[@BackToBackSWE]

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[@nitingupta1591]

The best traversal video till now. You teach using first principles. Hats off !

[@johnisdoe]

This video is VERY helpful in understanding recursion. I honestly brute forced recursion and never thought of it that way. As someone mentioned in the comments, this channel is a one-in-a-million!

[@BackToBackSWE]

great

[@samarth319]

Amazing content and teaching!! Gained so much knowledge in 20 mins than i could in my whole semester!! Please continue making such quality content on DS&Algo!! Thank you Ben.

[@BackToBackSWE]

nice

[@tajahouse4678]

This is AMAZING! And I laughed so hard at *LOUD CUTTING NOISE*! (Probably means I need to come out of my office for a bit lol) I for sure will be using this content for preview of whatever I am learning. Great work!

[@Elias_90]

best explanation ive heard, very intuitive (I've previously gone through the topic in two separate modules and didnt really get it so this was great help)

[@xMysticWolf]

Dude, you just made it so simple to understand, thank you so much! You're an amazing teacher, I get it now

[@bartlomiejdrozd2357]

Great stuff my friend! Way you use NLR, LRN, NRL is simply beautiful. Few minutes and I got to understand how binary trees are traversed! Thank you!

[@BackToBackSWE]

ye - great - sure

[@srinadhp]

The way you explained the recursion is class apart!!! Also how to identify pre/in/post order. Hats off. Will now search for your video on graphs! Hope you have it. Keep posting!

[@BackToBackSWE]

thanks and ok

[@Gyokuru7928]

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[@BackToBackSWE]

Thanks! Germany is sweet!

[@travissimelane1847]

I don't know how to thank you. You have saved me hours of reading a Data Structures Textbook 3 times just to get this concept. Very thankful. Please do not stop your great work

[@bufdud4]

Wow, I was struggling to visualize recursion for months. This cleared it up for me! Thank you!

[@BackToBackSWE]

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[@OTlesuh]

I never understood this in class, however after this video I've learned how to correctly implement it and view it from a conceptual standpoint. Great video!

[@WorldOfPersianDoc]

to the point and straight! thank you! in preparing for my qualifying PhD exam and i just arrive after work and come to starbucks to study! i dont have enough time to read allthings in book carefully so thats the reason this video save much more time for me! tnx again! :)

[@faridashaikh1015]

lnr at every node just made things so clear for me .....This is just amazing!!!

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Quality breakdown. Simplified, easy to understand. Much gratitude! Man, even very easy means of memorization. Fantastic.

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[@BackToBackSWE]

ok

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[@BackToBackSWE]

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[@BackToBackSWE]

thanks

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had a basic understanding before, your explanation sealed it for me, also patched up a concept i missed..Keep going 👍👍

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[@raphk1040]

you're amazing. I just started learning data structures in C and this is one of the best explanations i've found of binary trees..

[@BackToBackSWE]

Nice

[@AndrewDaniele87]

first time I ever subscribed to a channel after watching just 1 video, you have a great teaching style!

[@andreysantos6660]

Man, I wasn't being able to understand tree transversals properly until I've seen your explanation. Thanks a lot! Now I understand!

[@BackToBackSWE]

nice!

[@debanjanasantra6724]

half way through the explanation and really loved the nlr for each node! Hopefully now I can try to write logic on my own for tree problems. Fingers crossed!

[@marilu0007]

The only person with charisma to teach Data Structures, I love it! (mosh is also good but you are pure gold)

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Turn this one up! You're a great speaker and break down concepts so well.

[@BackToBackSWE]

thx

[@arkster00]

Hey. Just wanted to thank you for the content. You're clear and concise in your explanation which helps a lot.

[@BackToBackSWE]

hey, thanks

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[@BackToBackSWE]

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[@BackToBackSWE]

This is what I do

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To be honest, you way of teaching is as clear as crystal, loved it ...

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It’s hard to keep up and stay motivated with online classes, so I started slacking off in my data structures class. Thanks to you, I feel like I’ve caught up and I feel ready for my midterm on wednesday 😼

[@BackToBackSWE]

great

[@candaceleach2981]

Keep it up! Got to go back to the basics sometime and I really need this. Thanks!

[@BackToBackSWE]

sure

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[@BackToBackSWE]

ok

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Super helpful and helped me knock out my assignment in class in no time and will help me remember these concepts long term. Thanks for making these resources :)

[@BackToBackSWE]

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[@BackToBackSWE]

Haha, well I think my videos are "ok". I just want to do them and if it helps someone then all the better. If it completely goes over someone's head then that is fine too. Also, I think a table of contents in any instructional video longer than 4 minutes is key. Everyone comes to a teaching with different levels of preparedness and precontext. And in regards to the Algorithms stuff...we will do plenty of that just give it time since I have a long content list to cover. Those topics are in the list.

[@soumyajeet7809]

Lma4a Well i agree, that there's a lot of Indian content but u can't classify everything generally as low quality. I mean, since there are so many Indian channels, there's a good chance that the videos posted are not that good but there're some legit channels that if u learn from u definitely won't be disappointed. Instead u'll thank me later. See the videos on the channel "mycodeschool" and u'll know.

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I do have seen good quality Indian content videos. The thing is that as a non-native English speaker, i always have to spend extra time understanding what they said lol

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@@soumyajeet7809 Disagree. All of the content I encountered have been a waste of time. What's even more frustrating is some often switch between English and other languages, highly confusing for the viewer. Just make two videos or stick with one language and subtitle it.

[@soumyajeet7809]

@@emilyhao9272 Here are some Indian KZbin channels that offer their videos only in English and the quality of content is excellent. You should have a look at these. If you still find these a waste of your time, try learning from books or other channels. 1. Edureka 2. Intellipaat 3. Simplilearn 4. ProgrammingKnowledge 5. Mycodeschool 6. codebasics 7. TutorialsPoint India ltd

[@carinacarollomalinao7451]

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[@BackToBackSWE]

thx

[@persnlassname7137]

Thanks to your channel... It really changed on how I see the traversal works, I understand it better and I hope I can pass my midterm exam on this topic. Thanks dude

[@BackToBackSWE]

nice!

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[@BackToBackSWE]

It is indeed...it is indeed.

[@MatthewSeligman]

This explains tree traversal and recusion so clearly! Truly appreciate you sharing this information!

[@BackToBackSWE]

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[@chrismanda3158]

One of the best tutorials I have come across in a long time

[@BackToBackSWE]

nice

[@caleboke2771]

Using LNR as the call stack just help me understood how binary trees work in general. Thumbs up man

[@danielbee3697]

best explaining I've seen so far. Thank you so much!!!

[@connerjensen8170]

Awesome! Thanks for this video. I was just attempting a leet code problem where I had to traverse a binary tree and I was pretty lost. You're a great teacher!

[@BackToBackSWE]

sure and thanks

[@ruthylevi9804]

this is exactly what I was looking for, thank you!! top notch explanations

[@apurbapanja1693]

Thank you Benyam. The way you teach and explain is really awesome. I've really learned a lot from you. This video is special for "lnr" concept. Thank you again.

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Bro, you are the be(a)st, very intuitive explanations. I am not a cs major, but I can follow you very well. Please keep up the good work.

[@ichinnorovtuguldur3627]

I like how he teaches it so passionately. It was super helpful! awesome!!!

[@BackToBackSWE]

thx - and great

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Really sweet explaination with humoristic slices) It's gorgeous. Thank you!)

[@mustafacil8452]

I think, this is the best explanation on youtube. Thank you very much.

[@BackToBackSWE]

thanks

[@tobyhuynh146]

dude, your explaination helps me retain the information so much better than other tutorials. writing the policy on each node is a really good trick for a visual learner like me. Thanks

[@BackToBackSWE]

glad it helped

[@elimart345]

OMG thank you for breaking this down. I was really confused before this video.

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I finally got it! you are an amazing teacher. Thank you so much!

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Man this is the best explanation of tree order/recursion that I've seen great job!

[@BackToBackSWE]

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[@BackToBackSWE]

thanks

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[@BackToBackSWE]

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Great video. You completely changed how I thought about the 3 common ways to traverse a BST. Thank you!

[@BackToBackSWE]

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this is absolutely fire finally understanding tree traversal thanks mate

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[@BackToBackSWE]

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thanks for making the recursion so detailed. I really struggle with that concept

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[@BackToBackSWE]

thx

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[@BackToBackSWE]

great and great

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Brilliant! Brilliant! Brilliant! The best tutorial for traversal and recursion.

[@BackToBackSWE]

hahaha thanks

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[@randomshitclip]

It helps a lot when I tried to understand the Tree traversal, huge thanks!

[@BackToBackSWE]

We have always got your back!! 😀 Do check out backtobackswe.com/platform/content and please recommend us to your family and friends 😀