Top 7 Algorithms for Coding Interviews Explained SIMPLY

Today we'll be covering the 7 most important algorithms you need to ace your coding interviews and land a job as a software engineer. We'll be showing visualizations, common uses, and time complexity. Hope you enjoy!
📘 Chapters
0:00 - Intro
0:57 - Binary Search
3:43 - Depth-First Search
6:39 - Breadth-First Search
9:13 - Insertion Sort
10:57 - Merge Sort
12:52 - Quick Sort
15:57 - Greedy
🔗 Resources
Data Structures Video - • Top 7 Data Structures ...
Big O Video - • Big O in 2 Minutes
Recursion Video - • Recursion in 2 Minutes
Coding Interviews at FAANG Video - • Software Engineering I...
🎵 Music
Music Courtsey of Epidemic Sound
Wizzle - Guustavv
Slapperoni Pizza - Jobii
Unfettered - Jobii
At My Own Pace - Sarah, the Illstrumentalist
Deadlines - Dylan Sitts
Sleepy + Hungry - baegel
Tea Tree - Jobii
Taargus - Jobii
Pick Up Your Phone Please - baegel
Brontosaurus - Dylan Sitts
#coding #softwareengineer #algorithm

[@Codebagel]

Hey guys! Sorry for lack of uploads lately, hopefully this 20 MINUTE comprehensive guide to algorithms makes up for it a bit! Please like and share with friends, I worked really hard on it and want it to help lots of people!

[@ReluctantSpirit]

This video is one of the finest and well defined educational video on algorithms.

[@shadowrl7637]

Algorithms Binary Search: - Used to find a specific element in a sorted list efficiently. - Inefficient: O(n) for linear search, incrementally guessing from start to end. - Efficient: O(log2(n)) for binary search, repeatedly dividing the search interval in half until the correct element is found. Depth-First Search (DFS): - Begins at the root node and explores as far as possible along each branch before backtracking. - Utilizes a visited array to track already visited nodes. - Continues backtracking until all nodes are visited. - Real-life example: Solving a maze by systematically exploring paths until the exit is found. Breadth-First Search (BFS): - Looks at every node at one level before going down to the next level. - Utilizes a visited array to track already visited nodes and a queue to keep track of neighbors. - Begins at the root node and adds it to the visited array and all its connected nodes to the queue, then continues to explore nodes level by level. - Real-life example: Chess algorithms predict the best move by exploring possible moves at each level of the game tree. - Runtime: O(V + E), where V is the number of vertices and E is the number of edges. Insertion Sort: - Examine’s each element in the list, comparing it with the previous elements and shifting them to the right until the correct position for insertion is found. - Simple sorting algorithm suitable for small datasets or nearly sorted arrays. - Runtime: - Best case: O(n) when the list is already sorted. - Worst case: O(n^2) when the list is sorted in reverse order. - Efficient for small or nearly sorted lists, but inefficient for large unsorted lists. Merge Sort: - A divide-and-conquer sorting algorithm that breaks the problem into smaller subproblems and solves them recursively. - Starts by splitting the array into halves recursively until each subarray consists of single elements. - Merges pairs of subarrays by comparing elements and placing them in sorted order. - Continues merging subarrays until the full array is sorted. - Runtime: O(n log(n)) in both best and worst cases, making it efficient for large datasets. Quick Sort: - A complex sorting algorithm that follows the divide-and-conquer approach and is recursive. - Selects a pivot element, ideally close to the median, and partitions the list into two sublists: one with elements greater than the pivot and the other with elements less than the pivot. - Continues the process recursively on each sublist until the entire list is sorted. - Utilizes a pivot element that is moved to the end of the list, with pointers positioned at the leftmost and rightmost elements. - Compares the elements pointed to by the left and right pointers, swapping them if necessary, until the pointers cross. - Once the pivot is correctly positioned, the process repeats on the sublists. - Runtime: - Best case: O(n log(n)), when the pivot consistently divides the list into approximately equal halves. - Worst case: O(n^2), when the pivot selection consistently results in unbalanced partitions. Greedy Algorithm: - A problem-solving approach that makes the locally optimal choice at each stage with the hope of finding a global optimum. - May not always guarantee an optimal solution but is often simple and efficient. - Real-life example: Finding the shortest path in a weighted graph using Dijkstra's algorithm, where at each step, the algorithm selects the vertex with the smallest distance from the source.

[@Leonhart_93]

Good work, works for adding to quick documentation

[@ptd3v]

My man

[@Lu3ck]

Not all hero’s wear capes

[@bb-xj9ed]

thank you bro, my gf broke up with me so i have nothing but to learn algos, your video made me laugh at the greedy algo part. thank you u earned a sub

[@vedagyasharma5438]

stay strong brother!

[@ryostyles9904]

Great choice bro

[@airman122469]

Sounds like you just need some greedy algos and a creative application of the traveling salesman problem. (Routes through all bars, and pickup techniques)

[@kaushalrautela6]

Broke up and still leveling up GOD mode acticated 🤖

[@wadzanaikanongovere4798]

Looks like someone was greedy 😂😂😂😂

[@Redyf]

Code examples would help a lot too, great video

[@originallyme135]

This video is amazing! I was so surprised when I went to subscribe that you only had 5k subscribers, from the quality of these videos I expected at least 100k! Thank you for your awesome work, you really helped me a lot

[@tamalpaul4928]

Brother, You gotta be my best teacher on youtube. You making lesson just the way I want. You start a topic by first being pause. Then continue with the easiest way possible. Please make more videos like these.

[@i_am_spex6312]

Dude , you explain so well. Thank you

[@antonthordarson3610]

This is great, Very well explained and straight to the point. Way better than any teacher I have seen explain this..

[@thaisb.7708]

Amazing content, very clearly explained and the illustrations helped a lot, thank you for sharing.

[@khndokar2382]

Love your videos ! please do more, ive learned so much

[@MadhuKumar-zi4qp]

easy to understand bro.. great. Thanks!

[@hassanriaz4274]

Thank you so much for this detailed video bro👊👊

[@omgh8287]

I enjoyed the explanations and presentation about the different important algorithms in this video. I am subscribing to this channel in the hope of similar good content in the future. Wish you the best with growing your channel :)

[@Codebagel]

Thanks so much! I’m glad you enjoyed it. Content will definitely continue to get even better, so I’m happy you’re going to stick around :)

[@ngocchaunguyen1195]

This is an incredible video. I didn't understand most algorithms as a student, because I focused on theories and code. This video helps me save time in understanding these popular algorithms. Indeed, I rarely use them in my work, it is simply because we don't have many situations to apply. I usually use linear search in JavaScript. there was a time I had a problem with sort of 10,000 objects. I have to use the binary-sort library without understanding. Once again, thanks for your video.

[@durantburner7428]

With content like this you'll be big in no time, excited for what's to come!

[@Codebagel]

Thank you so much! I really appreciate the support!

[@katurr_Real_Estate]

This is the best explained algorithm I came across

[@LastShade]

For the traveling salesman, I would use a set of controlled variables that you could programmatically cycle through to optimize results. One example would be a tolerance on overlapping routes. Cycle through 0-10 overlaps and calculate results. Compare results. As long as you keep the number of variables and variable values low, it’s a great way to squeeze out extra optimization.

[@mesta3329]

Great job bro. It was very interesting & easy to understant

[@mitkomilev4690]

Good explanation, thank you. A small note for the quicksort - keep in mind that the unshift operation at 13:44 is really computational costly as you will have to unshift all elements to the left. It is better to just swap the chosen pivot element with the last one.

[@a.rohimsama7222]

Great explanation! Thank you

[@vasylshkrum8007]

Great job, mate!

[@yuqingpeng6523]

Very detailed explanation as always! I learnt a lot, thank you so much!!

[@Codebagel]

You’re welcome! Thanks for the kind words :)

[@NormieDead]

thank you soo much. i know this could have taken so much affrords to make .

[@akshaypatelindia]

Really impressive contents mate keep going . appreciate you'r contents and efforts. :)

[@wlqpqpqlqmwnhssisjw6055]

You should explain how machine learning works and more of that types of videos too ,your explanation is on another level

[@Codebagel]

Thanks so much! I’ll definitely tackle machine learning at some point in the near future, it’s on the list of future videos!

[@MeditateRelaxEtcetera]

Great explanation!👍

[@ShengjunSun-on1jr]

Great contents! Thank you!

[@abyss_v]

Great video, helped me a lot

[@franciagarciaromero2589]

Loved this, please make more videos

[@ranvirkumar108]

Great work men...

[@Antariksha]

Please keep going, your explanations are on point! Subscribed.

[@Codebagel]

Thanks so much!

[@ann.z.z.]

Thank you so much, amazing content

[@catarinaivf]

It was really great! Thanks

Amazing video!! thank you.

[@puneetparashar2935]

Love your videos.❤

[@bonginscandinavia]

Great explaination. 👍

[@user-xs9el5ek6n]

Good work bro keep on doing 👍

[@simonetumolillo9400]

I love the fact that you took the time for writing the outcome numbers of TSP in the comments haha. Nice work as always, keep it up!

[@Codebagel]

Haha yeah, to me that’s such a strong way to explain why certain algorithms are used. I’m glad you enjoyed!

[@coffeewithjava4]

Explaining Data Structures with Code Examples would be more beneficial. This video is informative too.

[@ektasingh5967]

I love all of your videos. Amazing they are. Please make videos on System Design as well.

[@ankiitamalik]

Thanks🙏 very clear explanation

[@TrishalWalia]

Best Explanation!

[@rutwikpatil8491]

Amazing video !!!

[@seannaeger9563]

I've been trying to understand these concepts for ages. Your videos rock! Even if you spell neighbor wrong. 🙂

[@servantofthelord8147]

Thank you :)

[@chamarr]

goated video🐐🐐

[@nurfuis]

Thank you for the video =)

[@therealzeon]

I know ur working hard my guy but keep pushing you'll breeze to 100 k by the end of the year dw 💪🧠 Keep up the amazing content man

[@Codebagel]

Thanks so much! Been such a grind lately with everything going on, but definitely going to start pumping out more videos so that’s good :)

[@LucasNunes-vg6zk]

Excelent content 🚀🚀

[@llmll6447]

Very good explanation

[@voegel]

Thank you for this comprehensive video! 21 minutes is a good length. Btw, did your job interviews went well?

[@voegel]

Oh and here is some advice that I think might be helpful: I know music in videos is vastly used, but mostly it‘s a bit too much. The music in this video was okay, but I actually liked the music-free videos more. They *seem* to me better structured/clean. I know this video has the same great content as always, but (maybe it‘s just me) I have problems following you. Idk, maybe I‘m wrong and using music is a good idea ^^ Just a friendly tip :)

[@Codebagel]

@@voegel thank you for the feedback! I’ve been experimenting a bit with the music, but I get that it might be a bit hard to follow with it. I’m going to experiment a bit with audio levels/not including it at all, thanks for letting me know :)

[@kikocassola]

Great job 👏👌😉

[@aninditabatra3810]

great video

[@arthurmorgan718]

Your content is literally quality over quantity , keep the good work man

[@Codebagel]

Thank you! I really appreciate it :)

[@K9Megahertz]

You don't really need to keep track of the visited nodes in a DFS. You just visit the left node first and then the right node, or in the case of a tree with n children per node, just visit them in sequential order. At least if you're doing it recursively. Maybe there's a reason to keep track of the nodes outside of the recursion for other purposes but not for the actual traversal.

[@hlubradio2318]

Thanks I'll subscribe for your hard work. Now to implement them in Python.

[@FaheemQazi]

Hi, i really like the graphical representation of these topics in simple manner, however i think that @10:40 the explanation of bubble sort is mentioned as insertion sort.

[@khndokar2382]

can you please upload the separate data structure videos? i really liked the hashmap one

[@Math_kru_earng]

thank you!

[@Rajukumarmsbsndb]

Hey! It was awesome.

[@sujeet4410]

I was here before this channel exploded. Keep the contents coming.

[@Codebagel]

Thanks so much Sujeet! I’ll keep working towards making better and better content for you to enjoy!

[@aaryankedia3919]

Hey, Thanks for the video. I am a final year CSE student and I have the placement season starting soon. I am left with a lot of DSA. Could you suggest me with some tips?

[@FunnySubmarine-ij4zk]

Thank you

[@user-de4yn8rv9l]

I really wonder how this video hasn't blown up after a whole year

[@varanasikirankumar8501]

Best video ever watched

[@hlubradio2318]

This so weird. I leaned all these in 1994 to 1997 but never heard of greedy or maybe I did but I certainly remembered the shortest path algorithm which is greedy

[@austinkry]

Man, this just helped me so much in ways I can't even explain. Took the entire time taking notes and all. Really appreciate the hard work that was put into this, like and sub from me cheers!

[@tony310430]

no hay un video que te enseñe todo, al final debemos consumir mucho contenido de calidad e intentar quedarnos con lo positivo de dicho contenido para internalizarlo y realmente poder implementarlo de manera adecuada. Este video a mi criterio cumple con el criterio de ser un video de calidad.... No comenté en inglés porque siento que los hispano hablantes que no son angloparlantes merecen también hacerse notar en las cuentas de tecnología donde usualmente solamente se habla inglés

[@archivegaming9112]

nice !!!

[@Daniel-jt3dn]

Excelente

[@voegel]

Hey, I‘m wondering if you are still planning to make a video about how to pass the resume screening? That might be quite interesting :)

[@Codebagel]

Yes, it’s actually the next video coming out! I’m hoping to get it finished and uploaded for Monday! :)

[@Codebagel]

Okay so I didn’t finish it in time for Monday haha, had 2 last minute interviews come up. It will be out by tomorrow though, guaranteed!

[@beeTechSE]

Wait for Dynamic programming video 😁🤘

[@sreyakarmakar4248]

Dynamic Programming left the chat..🏃🏻‍♂️🏃🏻‍♂️ PS: amazing visuals & explanations. Thanks ❤

[@kvelez]

Cool video.

[@deniz.7200]

DFS and BFS require sorted binary trees to operate, right?

[@muhannadalsabbagh8956]

Really appreciate your work but you are wrong about the insertion sort algorithm you explained the bubble sort insertion sort will compare each number with the previous numbers and put it in place. Hope you will fix the video

[@panthrax555]

I came here to say this. I've not heard of insertion sort before, this is definitely a Bubble sort.

[@oulaoula349]

Travelling salesman problem is à good support to practise genetic algorithms

[@shawnedwards5369]

What's with the use of arrays over stacks?

[@chamarr]

can you possible make a video on how to code up these algorithms? that is what i have the most trouble with

[@Codebagel]

Yes! That’s what’s coming out next! I’ll be doing kind of 8-10 minute in-depth videos explaining how the code works, and how to solve problems of using the algorithm! Stay tuned :)

[@chamarr]

@@Codebagel yessir goated youtuber🐐

[@YoYouWildinBro]

When I get my coding gig in the future, I'm gonna look back at these videos and think "This is why I landed this job".

[@Codebagel]

Wow, you have no idea how awesome that is to hear. Thank you so much for that, and I hope I can continue to keep helping you on your journey towards breaking into the tech industry!

[@itsaaron6423]

I learnt one and it never feels enough . 😅🥲

[@ACBros_06]

Nice

[@rondlh20]

11:48 How does this sorting work in detail?

[@GenericInternetter]

Greedy Algorithms prevent Analysis Paralysis. Good for coding and good for life. Sometimes in life you gotta just pick the immediately most beneficial step and jump into it.

[@tonyg861]

This is for the KZbin algorithm!!

[@mydream8513]

Bro i could gaurantee you that you can get a million sub in a year if u upload a video once per 3 days.

[@egsnowindy]

Thanks for the video. Note: Merge sort is not properly explained. 1. it requires creation of temporary arrays of size equal to the sorted array. 2. the "merging" process itself is not highlighted in video.

[@user-sp3ew1rs5m]

I rly wonder how those algorithms would help me to be better in solving coding problems

[@Sachin-je7ue]

Well explained but you mentioned binary search only works for sorted list but it is not true .It also works for unsorted.

[@GenericInternetter]

How can you magically know in advance the "median value" used in quick sort?

[@carlospena98]

Three fucking ads on a video ? I feel like I’m getting milked

[@arkan7rb]

i have a channel and i know how its time consuming specially wonderful videos like yours sir thank you in all languages of the world greetings from Yemen

[@aninditabatra3810]

🎉🎉

[@phir9255]

Is Introduction to Algorithms a good book?

[@alabhyapandey2999]

Greedy is hard!

[@MarkyGoldstein]

Software engineers should first focus on real world problems, such as progressing standardizations and protocols, de-powerize monopolys, and then of course optimize

[@VivanRangra]

where is dynamic programming ?

[@siphiweparker6178]

Im about to become a chess grand master with BFS

[@tskito7200]

Binary Litht

[@Noise3]

DFS 😅

[@bb-xj9ed]

Heyo