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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Опубликовано:

1 фев 2019

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Комментарии : 728

@BackToBackSWE 5 лет назад

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 4 года назад

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 4 года назад

ye, for the internet yo

@bonniwanamaker6296 5 лет назад

This guy is an amazing teacher.

@BackToBackSWE 5 лет назад

i try :*)

@connerjensen8170 4 года назад

Yeah for real I love his enthusiasm

@SquidBeats 2 года назад

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

@JossinJax 4 года назад

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

@BackToBackSWE 4 года назад

nice

@oasishusband5260 3 года назад

Ikr I loved that!

@Parthsean 2 года назад

I am a software engineer for 2 years and I didn't know that. Let me go sell my degree ...

@alexandergonzalez5975 4 года назад

This channel is a shiny gem among a sea of low quality CS channels. Please keep it up.

@BackToBackSWE 4 года назад

haha, what a statement

@andrews2945 3 года назад

*Ocean of low quality CS channels

@swimmingbyrd6283 4 года назад

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

@BackToBackSWE 4 года назад

yuh

@Moitaytay 4 года назад

I've gotta say; I've worked at Amazon and Lyft, where you'd think people have their fundamentals down like crazy, but they can't explain simple topics like these. You, sir, have the gift of teaching. Thanks for your help!

@BackToBackSWE 4 года назад

sure

@prashmokk6659 2 года назад

This video was amazing. I don't really comment on videos, but I had to express my appreciation to you for creating this. I got an interview about a month ago and this was the first of many videos I watched of yours while I was preparing. This past week I found out that I got the job and you were a big part of that. I'm not sure if you'll see this, but I hope you know that your videos have helped me and many others. Please continue to make awesome informational content like this!

@sunnypatel1784 3 года назад

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

@MM-lo9tk 3 года назад

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!

@travissimelane1847 2 месяца назад

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

@crewelghoul 4 года назад

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

@BackToBackSWE 4 года назад

great and sure

@MikeChaseJr 4 года назад

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

@BackToBackSWE 4 года назад

@fanifyeyev 3 года назад

I have watched dozens of similar videos, I can tell you, this guy is amazing. The way he provides the material is unbelievable, so motivated, so much energy, so much positive things can be felt.

@BackToBackSWE 3 года назад

thanks - this guy

@yannickwessidjam2036 Год назад

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 !!!

@juliannafotheringham7101 2 года назад

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

@gloriawang7493 10 месяцев назад

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!

@backup2ramdisk Год назад

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!

@andreysantos6660 5 лет назад

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

@BackToBackSWE 5 лет назад

nice!

@faridashaikh1015 2 года назад

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

@birbx3r354 3 года назад

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 3 года назад

ye, great

@mattdoestechstuff 3 года назад

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!

@iulia6707 3 года назад

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

@alexbowen3381 4 года назад

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 4 года назад

nice thx

@WorldOfPersianDoc 3 года назад

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! :)

@nitingupta1591 3 года назад

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

@haylydo8376 4 года назад

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 4 года назад

Nice to hear. Thanks and sure

@mhaland2775 Год назад

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 Год назад

thank you! Means a lot

@drodskate 5 лет назад

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 4 года назад

nice - happy 4 u

@manojchoudhary6146 3 года назад

I don't know who's those people who dislike such informative video. Great efforts, keep doing.

@marilu0007 3 года назад

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

@johnisdoe 4 года назад

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 4 года назад

great

@samarth319 5 лет назад

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 4 года назад

nice

@dennisdouglas5941 4 года назад

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 4 года назад

nice thx

@iaminhridoy5871 Год назад

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

@bufdud4 2 года назад

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

@BackToBackSWE 2 года назад

Amaze! Try our 5 day free mini course for some fascinating content - backtobackswe.com/

@ScottShaulis 10 месяцев назад

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

@OTlesuh 3 года назад

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!

@t1910j 3 года назад

Absolutely well explained. I am watching this before my google interview tomorrow. Thanks a lot! Subscribed!

@danielbee3697 Год назад

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

@dansteryoo 4 года назад

a lot of channels would have taken shortcuts to fast-forward or just breeze by each node explanation because it might feel redundant.. but man so thankful you understand repetition is an important part of education.

@BackToBackSWE 4 года назад

sure

@xMysticWolf 3 года назад

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

@bartlomiejdrozd2357 4 года назад

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 4 года назад

ye - great - sure

@caleboke2771 3 года назад

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

@Elias_90 Год назад

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)

@srinadhp 3 года назад

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 3 года назад

thanks and ok

@patrid0 3 года назад

I have never commented on a RU-vid channel before, but you sir, are an amazing teacher. 🤗 Thank you so much, lots of praise for you from the Namibia University of Science & Technology!

@konekoshoujo 2 года назад

Bachelors in CS, 3 YOE and this is the firs time I understood recursive tree traversal! thank you!!

@tajahouse4678 3 года назад

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!

@naveenantony3924 2 года назад

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

@ftedg 5 лет назад

A channel like yours pushing quality CS videos is really really in need... Thank you so much for your efforts. Most of what's on youtube is low-quality Indian content (no hate). Again thank you so much and please dont stop! I would recommend some videos on Algorithm designs like divide and conquer, greedy method etc.

@BackToBackSWE 5 лет назад

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 5 лет назад

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.

@huilingyan3981 4 года назад

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

@emilyhao9272 4 года назад

@@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 3 года назад

@@emilyhao9272 Here are some Indian RU-vid 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

@Gyokuru7928 5 лет назад

Best channel out there. They way you explain things, it really shows how you yourself experienced learning these topics. And Im glad to have found this channel. Big ups from Germany.

@BackToBackSWE 5 лет назад

Thanks! Germany is sweet!

@huaqian3654 2 года назад

You explanation to recursion is amazing!

@josephwong2832 3 года назад

The way this guy walks through these examples is crystal clear.

@BackToBackSWE 3 года назад

ye - this guy

@maxstanley1818 3 года назад

two years later, hands down best traversal video on youtube.com. I don't know why schools do not use the nlr rule

@dantedt3931 3 года назад

One of the best explanations for Binary Trees.Subscribed!

@gansaikhanshur4934 2 года назад

Who's watching this in 2022. This guys know how to teach!!! Thank you!

@shenzheng2116 3 года назад

I am a math student targeting for a data science career And I have to say this is the BEST computer science video I have even seen! Just AMAZING!

@BackToBackSWE 3 года назад

thx

@connerjensen8170 4 года назад

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 4 года назад

sure and thanks

@speedsanti 3 года назад

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 3 года назад

great

@Moonev_Fantasy 3 года назад

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

@darkhorse621 4 года назад

High quality and informative content. A must for conceptual clarity and interview prep. Thanks a lot for all the work !

@BackToBackSWE 4 года назад

sure

@raphk1040 4 года назад

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 4 года назад

Nice

@harrietread1749 3 года назад

This was very helpful for my A-Level CS, thank you

@wanyi8761 3 года назад

this is absolutely fire finally understanding tree traversal thanks mate

@Danny1905 4 года назад

Awesome. I came from a great CS book I'm reading and the chapter I'm right now touched this topic, so I came here for more info and wow. You helped me to understand it so much better! Keep it up! This channel is awesome

@BackToBackSWE 4 года назад

thanks

@matthewpourroy1342 5 месяцев назад

BY FAR the BEST explanation ever, thank you!!

@arjay_2002 3 года назад

Thank you. 20 mins well spent!

@ruthylevi9804 2 года назад

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

@xxlhara 3 года назад

man, you've got some intense energy, i love it.

@debanjanasantra6724 3 года назад

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!

@AndrewDaniele87 3 года назад

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

@chahalpawanpreet 3 года назад

Superb job clipping this all together

@sipwhitemocha 2 года назад

Love your enthusiasm pal. Thanks for great video

@frozen_tortus 3 года назад

Absolute hat's down. The teaching style is unique and I love it.

@diveruzumaki5556 2 года назад

after three years I finally understand tree traversal properly T_T , THANK YOU

@persnlassname7137 4 года назад

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 4 года назад

nice!

@baranturkan9589 2 года назад

Dude I wanna say that you are really impressive. This subject really made me confused but with your teaching style that shit became more understandable. Thx so much.

@ichinnorovtuguldur3627 4 года назад

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

@BackToBackSWE 4 года назад

thx - and great

@zb2747 Год назад

Straight to the point and great breakdown - thank you!

@huseyincandayan7947 4 года назад

Amazing video. Spot on teaching. Thank you very much.

@BackToBackSWE 4 года назад

sure.

@rayaneyahiaoui4174 4 года назад

Your videos are great man. I love your explanations and your examples. They're concise and straight to the point. Keep them coming buddy!!

@BackToBackSWE 4 года назад

@viniciuspedroso5923 2 года назад

Finally a decent explanation on tree traversal, thank u

@elimart345 3 года назад

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

@ocholol 4 месяца назад

Your channel is carrying me in my CS class rn, tyty.

@carinacarollomalinao7451 3 года назад

Sir, thank you very much for this video! Wherever you are, I hope you are safe and feeling well. You made me analyze this in the simplest way possible! I am very grateful to you sir. Thank you so much!

@BackToBackSWE 3 года назад

thx

@jonathongreenlinger4282 5 лет назад

Dude, this is seriously so helpful. You explained it well and got right to the point. Keep it up

@BackToBackSWE 5 лет назад

sure

@jonathanluo0 Год назад

5:24 explain very well on nlr (Preorder) traversal on each node, plus recursion in general

@rushawncampbell7284 2 года назад

I had to subscribe, your explanation is on point, clear, easy to follow.

@apurbapanja1693 3 года назад

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.

@mariavic822 2 года назад

you make this lesson so EASY to understanddd... thank you!!!!!!

@belledecena199 Год назад

Thanks to you! I am able to submit my project because of your video!

@arkster00 5 лет назад

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

@BackToBackSWE 5 лет назад

hey, thanks

@pranavmedhi3237 4 года назад

All videos on this channel make my concepts Crystal clear

@BackToBackSWE 4 года назад

nice

@sohamkar876 5 лет назад

This was just what I needed! Thank you so much for all you do.

@BackToBackSWE 5 лет назад

This is what I do

@MatthewSeligman 2 года назад

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

@BackToBackSWE 2 года назад

Thank you, glad you liked it 😀 Do check out backtobackswe.com/platform/content and please recommend us to your family and friends 😀

@anto1756 3 года назад

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

@sasbazooka Год назад

I'm a Sr. Software Development Engineer who got here without ever taking any CS courses, and now I am hurting for that. This dude here is giving me the exact info I need to fill in the blanks. Bravo dude!

@BackToBackSWE Год назад

Thank you, appreciate it 😄 Also check out our Free 5 Day DSA Interview Prep Mini-Course - backtobackswe.com/ 🎉

@reinasama904 Год назад

The quality of this material is beyond what we deserve THANK YOU SIR

@thomasl863 3 года назад

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

@BackToBackSWE 3 года назад

thx

@brucewayne3141 3 года назад

I study CS at an Ivy League school and I didn't learn shit from my professor's lectures. Your videos are literally saving my grade cuz my final is tomorrow. Thank you.