9.1 Knuth-Morris-Pratt KMP String Matching Algorithm

[@UsmanKhan-lp2mg]

Computer Science students will always be thankful to this legend ❤

[@SarbojitGanguly]

yes, true that. He is simply amazing.

[@ManishKumar-vg9yz]

chat.whatsapp.com/GSKHF9PdnJkKbjbW0MDgqt

[@khizratariq9629]

Yess

[@prashantrandive6132]

Not only computer science student ,All engineering student be thankful to this man❤️❤️

[@satyamkumar2820]

not only CS students, Whole community who are interested in Algorithms

[@priyabrata8467]

At 11:33 on pattern P3 aab should be 123 instead of 120

[@arsalanhashemi4469]

yes true

[@catlord69]

was wondering the same, thanks for confirming

[@myeverymusic]

@@abdul_bari You made the most clear explanation on where the KMP algorithm comes from, instead of just showing us how to compute the KMP array using the pattern string. The way you teach allows students to understand the background, thus we can always recall the algorithm even if we forget. This is the same idea on learning math. You are a great teacher! :)

[@sharpnova2]

@@abdul_bari that is not helpful. what would be helpful would be for you to insert an annotation at that point in the video.

[@arindamchakraborty7362]

C is also matched in P3 so it will be 1234

[@makeitswift9839]

Thanks for explaining KMP in simple terms

[@ankityadav-ci6gy]

the pursuit of understanding this algorithm always scares the hell out of me ..... u came as a savior...thanks a lot, Sir.

[@gugy6541]

correction: 11:27 last `b` should be 3. thanks Abdul, I find your explanations more than helpful! keep up the good work!

[@harshdeepanshu277]

yup you are right.

[@111rhishishranjan2]

yes man,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, shai bola bhai {for indian guys}

[@TragicGFuel]

non indians nhi dekhte baitheenge @@111rhishishranjan2

[@yousufahmed985]

yesss

[@ayyan6061]

Serious guy.

[@richardszegh6443]

this guy achieves to teach things in 20 minutes that university teachers fail to teach in hours

[@muscleinjury3331]

*fail to teach in semesters

[@ManishPandey-ub1hj]

@@muscleinjury3331 You need to go to a better university

[@ketanraghunathraut7615]

@@ManishPandey-ub1hj no he is right,same for me

[@extraFart]

I watch his videos on 2x

[@rheumaticharm9551]

@@ManishPandey-ub1hj lol then go to ur University dnt come here.

[@mamtachahal1277]

You might have heard it many times, but still I prefer mentioning it that all these efforts you made to make such valuable contents free of cost is amazing, This is going to serve many programmers for the next coming years as well. Be it your way of explanation, your intuition every thing is just perfect. And we the programming community is thankful to you sir. I do hope that you will be making more videos in the coming years. That is the only negative thing that I hear about this otherwise wonderful channel it that the advanced data structures and algorithms are not being covered. This is just a feedback from someone who has been following your videos for quiet a long time. Again thank you sir

[@mrreese2342]

I was so happy when i typed the algorithm's name clicked search and this LEGEND shows up!! all CS students love you sir.

[@lukemorrice8692]

The best KMP algorithm explanation on KZbin.

[@R0hirrim]

Additionally, the only

[@taivinh1986]

@@R0hirrim actually no

[@bhanup3376]

Tell the truth BRO

[@adityalahiri4529]

agreed

[@soupoverflow]

This man has singlehandedly helped me through so much of my undergrad degree. All for free. I can’t thank you enough Mr. Bari!

[@lifeofbalaji]

This algorithm is mostly used in research field. Interviewers won't expect you to formulate KMP in a span of an hour. Rabin-Karp with rolling hash function is some want less complex and less efficient algo(Better than naive though) which can be used in an interview. That being said, I'm only here for this legend's explanation, I'm a big fan from Chennai, sir.

[@shritishaw7510]

though they don't expect us to use kmp algorithm in interviews. Knowing the concept and the implementation can turn tables for you in the interview.

[@azizvohra3142]

@@shritishaw7510 But do they expect us to. know this algo?

[@gladyouseen8160]

Question was asked in Microsoft

[@thenishantgiri]

@@gladyouseen8160 was the implementation asked??

[@vivekverma4012]

@@thenishantgiri yes complete implementation

[@dilukshanbimsara357]

7:45 Start KMP (0:00 to 7:45 Naive String Matching Algo)

[@sushiANDpizzaa]

thank you sir

[@udaypatell4956]

Thankyou

[@shritishaw7510]

Before playing this video, I watched the explanation by some other expressive KZbinrs, But honestly, no one is nearer to the way you explained the thought process of the KMP algorithm. Thank you for your lucid explanation.

[@jimmy1681000]

You teach me how to appreciate the beauty of algorithms. Thank you so much.

[@susheelnomula]

sir small correction to be made at 11:30 for the pattern 3 lps array will be lps[] = [0, 1, 0, 0, 1, 0, 1, 2, 3, 0]

[@HemantBatra5678]

Exactly

[@thakursatyamsingh2026]

yes you are right

[@stenoking237]

Yes exactly

[@travellingsLenses]

Literally one of the best explainations of KMP on internet :) Keep it up sir.

[@shafiquemohammad2876]

Its 2021 and its still the best KMP explanation available on KZbin.

[@alexandersafi569]

Thank you enormously from the Netherlands !

[@sgr2683]

Teachers are God and you are one of them...THANKYOU SO SO SO MUCH SIR. Today, our teacher taught the algo but in a complex way, and said that it will take 2-3 hrs honestly to understand but you saved my time.

[@sonitushar93]

After searching on internet not found anything better than this video, really appreciate!! Thanks for such simple explanation of this algo.

[@Pankajkumar-dy9ef]

HUGE RESPECT TO THIS LIVING Legend!!!

[@NoName-qp7hq]

Students are benifiting from your videos years after years... Dill se Bohot bada Thank you aapko Bari sir.. Absolute legend 🙏🏻

[@natesh1]

I have seen some videos trying hard to understand kmp, but none of them have given such clarity like u did. Thank you so much 😊. It's a wonder how just a change of few words can make a huge difference in understanding.

[@PetBuddies]

hello Sir, I know I might be mistaken but at 11:25 aren't we supposed to put 3 under be at aab since it matches the prefix sequence aab. Please let me know. Thank you for your concern. And overall I understood the whole thing. Your lectures are the best.

[@HakaishinBlast]

Yes you right, that is a mistake.

[@ShivamTiwari-zb7ty]

That's why sir stuck for a moment but then ....

[@vyasvasudevan9040]

See the description, he's mentioned it.

[@Beak12345]

Yes that's right

[@nandanbanerji8309]

No one can teach better than You sir. I convey my all respect to you. Desire to meet you personally and just want to bow before you to pay my respect.

[@pg.n5694]

As always my professor out here dropping gems on us humble students. Much love. We appreciate you

[@mohamedel-hadidy4844]

Thank you sir If I passed my exam tomorrow, you will be one of the reasons بارك الله فيك ربنا ييسر ان شاء الله

[@skilfuldude7312]

passed ?

[@mohamedel-hadidy4844]

@@skilfuldude7312 Yeah and now I'm in the last year Thanks to God الحمدلله Wish me luck :D

[@priyavardhanpatel6155]

I can't say how much thankful I am. I have read this from book 4 times and still didn't understand a bit, but after watching your video only once fully understand KMP. Thank you so much Abdul sir.

[@big-blade]

Unmatchable Explanation in KZbin. You're a legend Sir. Thank You.

[@raajkiran5983]

The best tutorial on KMP. some unpeople taking money for unteaching at unacademy. And this guy is teaching and taking unmoney.

[@namanvijay3514]

Used to watch your videos in my second year, watching again for revision in my final year preparing for placements! ( currently holding two offers from big tech companies)Thanks sir.

[@mannanarora-w6f]

hello bhaiyan , i am in 3rd year what to do for placements?

[@doxuanhoang8767]

From Vietnam with love :3 Computer Science students will always be thankful to you

[@guifanweng410]

This is the best explanation I have ever seen. I have searched for several videos, most of them just focus on implementing without much reasoning. However, after watching this video, I fully understood the principle behind KMP and implemented the algorithm by myself. Thank you very much.

[@rashmidhakad4436]

You are awesome. None of the people in my university was able to simplify this algorithm for me.

[@collingriffin7949]

Better than my professor's explanation, keep it up!

[@preetkamal7424]

I am a beginner and it was beautifully explained. The only KMP video I understood. Thanks a lot sir!!!

[@jpakash1999]

Man , I used to watch ur videos during my college days . its been 5 years that i graduated still I learn from your videos. Where is he now , no new videos at all these days

[@alone_man3198]

We are very grateful to you that we got such a important person in our life....

[@0rdsec]

Standing ovation. I'm a total noob when it comes to algorithms, and I can now say that I fully understand this absolute monster. Thank you.

[@ShubhamSharma-oq4hr]

you just called him absolute monster

[@saumyakhati5612]

@@ShubhamSharma-oq4hr In case you are not being sarcastic, he was referring to the algorithm.

[@ShubhamSharma-oq4hr]

@@saumyakhati5612 yep i did misunderstood him.. thanks

[@bhavyanshjain5502]

🎯 Key Takeaways for quick navigation: 00:00 *🧐 KMP Algorithm Introduction* - Introduction to the Knuth-Morris-Pratt (KMP) algorithm for pattern matching. - Overview of the problem: finding a pattern within a given string. - Mention of basic algorithm and the need for more efficient solutions. 07:42 *📊 KMP Algorithm Terminology: Prefix and Suffix* - Explanation of terminology in KMP algorithm: Prefix and Suffix. - Definition of prefix: a subset of pattern characters starting from the beginning. - Definition of suffix: a subset of pattern characters starting from the right. 09:50 *📝 KMP Algorithm Pie Table Generation* - Demonstration of how to generate the Pie Table (or Longest Prefix Same as Suffix) for a given pattern. - Illustration using multiple examples to build the Pie Table. - Importance of the Pie Table in optimizing pattern matching comparisons. 12:21 *⚙️ KMP Algorithm Working Principle* - Step-by-step walkthrough of the KMP algorithm's working on a pattern and string. - Emphasis on avoiding backtracking in the main string (no i backtracking). - Handling mismatches by adjusting the indices, focusing on moving J while keeping I's position. 18:23 *🕰️ KMP Algorithm Time Complexity Analysis* - Time complexity analysis of the KMP algorithm. - Breakdown of time spent on parsing the string, preparing the Pie Table, and searching for the pattern. - The overall time complexity is linear, making it an efficient pattern matching solution. Made with HARPA AI

[@jashanpreetsingh_]

It's December 2024 & Bro is still ----> THE GOAT 🐐

[@JohilAngelo]

Don't ignore this video because of 19 mins duration, You can set the speed to X1.25 and listen. Each and every input from this legend is just amazing Thank you sir. Happy learning😀

[@AryanSingh2512.]

I must say that u are an amazing teacher. In most of the videos, people often suggest tricks, but you explain that trick technically which sounds much more professional. Your videos are great. Please upload illustration of Red-Black Tree.

[@user-vo3uy6sv3j]

Dozens of videos trying to understand how the pattern works, found your video and understood in 2 minutes, tysm

[@ahmedifhaam2669]

Funny how my lecturer took 5 hours to teach this topic, and I actually understood during first 30 mins, then he confused me after an hour, I understood again, then he confused me again and pattern repeated, after 5 hours I questioned everything I learnt lol. And this guy did it. the right way

[@satioOeinas]

atleast he took 5 hours trying, ours just mentioned it, and then added some tasks about it on our assignment

[@LV-ei1ce]

Very professional explanation. No matter what, professors are professors. They know how to explain clearly :) Thank you for your time. Appreciate it.

[@catboymazov6309]

KMP starts at 7:40. You're welcome.

[@AJ-te4jn]

Of course sir, but when just one hour is left for the exam, we need your algorithm faster!! :)

[@saurabhshrigadi]

AJ you are right bro , jo pura saal nahi kiya wo end me youtube se sikhte he aapn log

[@ninewinskull934]

Aditya Ravichandran I

[@mohammedyakub7787]

thanks bro

[@tariqchhadia1035]

Before 7:40.... There is Naive string match algorithm...

[@ocoocososococosooooosoococoso]

this guy is legend... i now understand how KMP works. Thank you so much.

[@mkmkmk845]

wish all these great tutorials were available when I was doing my graduation.

[@vaibhavbhardwaj8895]

Thank you soo much sir for the help i was stuck on this algo for the entire day trying to watch different videos to get a proper explaination and then your video poped up and changed everything :)

[@TridibSamanta]

Great ! You are a great Teacher. Thanks for saving my Design and analysis of Algorithm Paper. God in disguise. #Respect

[@sahilanand30]

I've been roaming around tons of yt channels but I found the easiest and most understandable explanation here.

[@TavsanCavus]

hello king you dropped this 👑

[@wokpokie]

Mr Bari, you're truly a gem. None of the videos online could explain these concepts as clearly as you. Really appreciate what you are doing!

[@cutiex7357]

I've been watching your video since the dawn of my CS study!!! Thank you!!!!

[@Cloud-577]

I watched too many videos on Knuth Algo and your explanation is by far the best I have seen. Thank you very much! you a life savior.

[@debugagrawal]

You keep students interest in topic through out the video, thanks for your efforts🚀✔🤘

[@jitendrateli7824]

Its an really Nice Explanation. its so much better than reading at geeks for geeks. Sir is making so much worth to learn at KZbin. 🙏

[@aditikhatri7979]

Thank you so much sir! The book I am using has an explanation that I cannot grasp so easily but your explanation is crystal clear.

[@janakmakwana4627]

TRUE :)

[@zalgothedestroyer9432]

Dude I love the video so much. When you found that last match it gave me a big smile. This algorithm is cool! You do such a great job explaining the concept. Thank you for the video.

[@267praveen]

11:29 - the moment you realise you made a mistake but still decide to ignore thinking " chal yaar chod ... Kya fark paindaa hai"

[@replicatoria]

last b should get 3 ,right?

[@pratimasingh1258]

@@replicatoria yes

[@jeremiahthomas7594]

@@replicatoria yep

[@Gurpr33t.S1ngh]

@@pratimasingh1258 yes i was also thinking the same thanks for helping

[@SanjibAhmad]

@@replicatoria, you're right: a a b c a d a a b e = 0 1 0 0 1 0 1 2 3 0

[@sawanpatodia5095]

Really appreciate how you explain with examples. Makes it really easy to understand even difficult algorithms. Thanks.

[@malihanan541]

I was so confused, turns out it is pretty easy! Thank you!!

[@akshaykumarr7541]

huge respect to u sir.......every department will have one professor like this.....unfortunately i landed up here for having the worst ada teacher

[@priyavutukuri1223]

Sir, you should definitely create a bootcamp course for technical interviews, you ll save so many lives. Thank you for all your efforts sir !

[@AbdulRahman-rg5dq]

Sir you are legend your teaching method is amazing alot of love from peshawar

[@itzcs1861]

A very lucid explanation to a complex algorithm. Thank you very much sir.

[@prestoX]

You are the epitome of awesomeness, when it comes to lucid explanations !

[@jaikumargupta1368]

9:36lecture start

[@arunachalamm3399]

OP explanation.. now i understand why my whole college watches you sir

[@adhikari669]

Sir at 11:55 at p3 I think there's a mistake rest is great ❤️

[@jcwng9955]

Was still lost after a blog and 2 other videos, only your video explained this so clearly! Thank you!!

[@SS-qf3pl]

in P3 for a a b repeating for 2nd time it should have 1 2 3 but you gave 1 2 0 sir..please verify it!! awesome content ❤️❤️

[@cutiex7357]

I have the same doubt!

[@shahjahansheikh9189]

I use to bunk classes bcz I believe in this man,every complex concept is easy here

[@shumzmut9639]

Fabulous! Excellent explanation. Thank you sir!

[@us-wolf]

OMG this is the best explanation in KZbin, thank you so much عبد الباري

[@lradhakrishnarao902]

Hi, great video. I have a doubt. For pattern P3, why aab is not 1,2,3 because it's getting repeated?

[@kartikkhandelwal3518]

same confusion

[@pabloosorio6647]

THat seems to me as a mistake

[@krishnachaitanya8088]

for some time i thought i was in classroom, Thank you so much sir.....

[@harikagajam1238]

those who have exams in coming hours start at 7.40

[@CodewithRazan]

The best explanation from the best teacher ❤

[@ronishtailor]

Kmp starts at 7:39 ... Thank me later 😁

[@mystyleforedu]

sir, is legend no doubt but our university faculty taking tym due to making all of us understandable, respect to all faculty.,

[@yulong5528]

KMP starts at 7:42

[@goldenboy0121]

Damn this the clearest explanation i’ve seen so far, not even chatGPT can explain it this clearly

[@palashrathore6277]

7:40 for those who want to go straight to KMP explanation without that naive one

[@ShaneHughes-q1x]

Again - Abdul - thank you for another great video. You make things so easy to understand without fluff.

[@ramakrishnakondibhaneni4030]

11:37 in p3:last b should be 3 why 0?

[@nikil_youtube]

Yes

[@gaurav66666]

HAIN??? KYA BAAT KAR RA HAI??

[@wilbertcoandadiputra2487]

bro is my saviour when it comes to mid or final exam. thank you mr bari

[@shazzedhossainshajal6889]

p3 last b should be 3

[@afsarabc]

~ 3 hours of struggling with different textual posts and videos , It seems this last 20 minutes video has transitioned me from naive to KMP string search implementer. Thanks Sir

[@surabhisharma6608]

sir we absolutely love your videos, if you could pls include the algorithms for all these concepts too!

[@IrfanAhmed-vf7nb]

The only video I found helpful on kmp for super clear understanding thank you sir

[@apporvaarya]

i really wish if you were a professor in my NIT college. :)

[@nannubedi7773]

bro u lucky to be in NIT, how are the prof there? Here its too bad, even though ours is a Govt univ :(

[@mehulsonavane3549]

He was just kidding

[@aminurrahmanashik2786]

Abdul Bari is a boss! Always remember you for your perfect explanation Sir. Thanks a lot!

[@adilmahmood9098]

IN P3 aab and aab are same so, the next aab must be 123, time 11:55

[@shreybhargava5442]

Yes..same doubt ..it must be 123..🤔

[@anikacharjee3932]

wow!!!!!!!!!!!! I didn't clearly understand in other tutorials.. But u make it full clear,,.... tnx sir...(Bangladesh)

[@sharondenys8211]

You are awesome! Can you do video of Amortized analysis and loop invariant next time? I feel like these 2 topics are hard to understand

[@aniruddhsingh5280]

Your explanations are very clear and easy to understand

[@ritik84629]

Abdul sir aap Google kyu nhi try karte? Oh Sorry Google aap Abdul sir kyu nhi try karte?

[@techwithwhiteboard3483]

fuck off

[@NerdistRay]

@@techwithwhiteboard3483 Dude, what the hell? Chill out. He was making a joke here.

[@adamhermes390]

Amazing and you nail it perfectly , CS students love you