Longest Palindromic Substring O(N) Manacher's Algorithm

Problem:-
Given a string s, find out the longest palindromic substring in O(N)
using Manacher's algorithm.
This video explains the Manacher's Algorithm for finding out the longest Palindromic Substring.
Useful References:-
en.wikipedia.o...
articles.leetco...
tarokuriyama.co...
Website: www.ideserve.co.in
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[@ritikparida3104]

GFG took 4 articles to explain this. This man nailed it in only 15 mins .

[@IDeserve]

Thanks Ritik!

[@KshitijBhatnagar]

This is really true.... :)

[@AnkitSharma-nf2gp]

23 min lie h bhai acche se dekh

[@AP-eh6gr]

epic explanation man. watching it twice did it for me. i can imagine the patience it took you to make these 176 slides

[@IDeserve]

+ashish paralkar Thanks a lot for your kind feedback and you are right in that it took some patience to create this video. Ashish, we would really appreciate if you can spread the word about IDeserve(www.ideserve.co.in) in your peer circles.
Cheers,
Team IDeserve

[@bryanbocao4906]

@@IDeserve Thanks for making these slides and video! How long did it take you to make these slides?

[@rahulchaubey8988]

Bro mai ni samajh paya

[@ntesla5]

8 years old but still better explanation compared to newer videos explaining the same

[@IDeserve]

Thank you :)

[@fredesch3158]

couldn't get anything from the explanation alone, but as soon as you started showing the code, everything you explained started to click into place, very much well done

[@jony7779]

I have honestly never encountered an O(n) algorithm that is tricker than this. You give the best explanation though, thank you.

[@IDeserve]

Thank you so much for your kind words Jon!

[@Adityarm.08]

Ukkonen's suffix tree construction would do if you want to see that. 😄

[@mohammadanasmudassir9443]

@@Adityarm.08 That algorithm is an atrocity. I was only able to code 80% of it and cannot understand the online solutions :/

[@Adityarm.08]

@@mohammadanasmudassir9443 you need test cases, very thorough ones. I was also stuck at that point where you are - I think. that 1 famous Stack overflow post has a full chain of comments all of which taken together paint the full picture.

[@bittupaul9455]

Ukkonen is a nightmare

[@expansivegymnast1020]

Took me over a week to finally understand all of this. This is one of the hardest algorithms out there. Outstanding work!

[@IDeserve]

Thanks 😊

[@dazleopper99]

thank you ! Great job !@@IDeserve

[@eceserin]

Save time: I watched all of Manacher`s algorithms on youtube, this is the best one.

[@IDeserve]

Thanks Ece!

[@ziyanwang6937]

Best explanation on Manacher's alg I've ever seen! Really appreciate you for sharing this!

[@IDeserve]

Thanks Ziyan!

[@DanielOchoa23]

Dude. This was hands down the BEST explanation for the algorithm I've ever heard. Thank you so much!

[@IDeserve]

Thanks Daniel!

[@shefalichaudhary8621]

I was struggling the whole day to understand this topic and now finally I saw this video. I feel relieved now , very well explained along with the code.

[@IDeserve]

Thanks a lot for your words Shefali :)
We are striving hard to make understanding algorithms easier.
We would really appreciate if you could spread the word about IDeserve in your college and to your colleagues.
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It has features like Algorithm Visualization, Learn Together and many more coming soon.
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[@fizzburn]

IDeserve, you definitely deserve a standing ovation! I can't wait to checkout your other videos. Thank you!

[@IDeserve]

Thanks bro!

[@subhedarsanchay]

I don’t give up often but when I do it’s Manacher’s algorithm 😂

[@IDeserve]

🙈

[@ankitagupta8511]

+1 😒

[@tonystarc9567]

This was pretty difficult to understand but your efforts are commendable. Thank you

[@ZeeshanSagheerAnsari]

Epic video on Manacher's algorithm . Very clear and precise explaination. Appreciate the effort you have put to create this content.

[@IDeserve]

Thanks Zeeshan!

[@doug8171]

So far, the best video for understanding it, rather than just explaining the process

[@IDeserve]

Thank you so much Doug for your kind words :)

[@englishlnowledge486]

This is best lecture, I have found on RUclips to understand the Manacher's Algorithm. The way you teach It reflect how much deep understanding You have. Thank You for this wonderful explanation, It saves lot of time and effort.

[@IDeserve]

Thank You! 😊

[@jabedhasan21]

I agree with you. When I started thinking about revising this algorithm, I came here.

[@emilianobustamante5013]

been trying to understand it for hours and I understood it perfectly in a 15 minute video. thank you so much!

[@IDeserve]

Thanks :)

[@shivanshshekhar]

Was really struggling to the point I was gonna skip this algorithm. You helped me understand it, thank you so much for your help! This is way better than some videos with more views.

[@IDeserve]

Thanks for the comment Shivansh :)

[@BryanRink]

I didn't think I fully got it when I finished the video, but then I tried to code it without referencing back here and it worked. Thanks!

[@casinarro]

the best and most clear explanation of manacher on YT

[@IDeserve]

Thank you :)

[@shubhampareek2378]

I don't think this could've been explained any better than this. Appreciate your efforts, sir.
Keep up the good work.
Thanks

[@IDeserve]

Thanks Shubham!

[@AbhrajyotiKundu00]

After spending 1.5 days on this problem, and reading that 4 pg GFG article, thank God I found the link of this video in the discuss section of GFG. This is the Best Explanation till now of Manacher's Algo. Thank You @IDeserve for this wonderful explanation :)

[@IDeserve]

Thanks Abhrajyoti!

[@tusharvyavahare9229]

I've watched around 5 videos and read 6 articles on this topic, and this video is the best and lucid explanation of the topic. Thankyou!

[@IDeserve]

Thanks Tushar! 😊

[@priyanshuranjan1038]

gone through many videos of manacher's algorithm.But this is the one where my searching stopped.Thank you for this awesome content

[@IDeserve]

Thanks Priyanshu!

[@sudiptapaul9855]

Your explanation is Amazzing, simple and easy to understand, probably the best for such a complex algorithm. please keep it up. Thanks for this video and thanks to Mr Manacher as well for this algorithm.

[@IDeserve]

Thanks Sudipta!

[@kunalpareek8321]

Excellent and very detailed presentation of a very complex topic. A lot of work must have gone into the graphics.

[@IDeserve]

Thanks Kunal!

[@asifmujtaba334]

I was struggling yesterday night switching from video to video, at first, I didn't understand your explanation, but now it's clear. Thank you very much.

[@IDeserve]

Thanks for your kind words :)
We would really appreciate if you could spread the word about IDeserve in your college and to your colleagues.
Also please check out our website at: www.ideserve.co.in
It has features like Algorithm Visualization, Learn Together and many more coming soon.
Please check it out and leave us a comment there!
Thanks,
-Team IDeserve.

[@imranyusubov4187]

great explanation, finally understood the enigma of Manacher's algorithm. keep doing the cool work

[@IDeserve]

Thanks Imran!

[@arnabchatterjee7651]

wow man the amount of effort you took to explain in this video is incredible, take a bow sir

[@IDeserve]

Thanks Arnab ☺️

[@winstondu4180]

Hey, I love these videos. These are definitely helping me as I prepare for the interview for my internships.

[@IDeserve]

+Wenhao Du
Thanks a lot for your words! It is very encouraging to hear such comments!
Also please check out our website at: www.ideserve.co.in
It has features like algorithm visualizations, learn together and many more coming soon.
Please check it out and leave us a comment there!
Thanks,
-Team IDeserve.

[@KshitijBhatnagar]

Nice explanation... I watch the video a couple of times, but I understood it perfectly. Thanks man for sharing this.

[@IDeserve]

Thanks Kshitij for kind words!

[@Kp96321]

Thanks, the best walk-through of the algorithm I've seen so far!!
Why'd you guys stop making videos?

[@prabhavagrawal1712]

Seriously, the best explaination I could get on whole youtube.
Thanks :)

[@IDeserve]

Thanks Prabhav!

[@aayushisingh3280]

The "thinking pause" did it for me. I am floored

[@madhivarman508]

went through a lot of videos to understand this algorithm. But this one is the best so far.

[@ankishbansal420]

Thanks man. I struggle for whole day to understand it, but you made it so easy. Really appreciate your effort.

[@IDeserve]

Thanks Ankish!

[@vijaykumarlokhande1607]

I had decided to skip manachers algo for upcoming placement! Now I have it in my toolkit! thanks man
gr8 job!

[@IDeserve]

All the best for the placements!

[@shubhamchandra9258]

Superb explanation. I was able to follow through without any trouble. Hats off. Would be great if you could explain KMP algo and Z algo as well. Thanks for this one.

[@IDeserve]

Thanks Shubham!

[@柯宥安-q2e]

Best Manacher's Algorithm explanation I have ever seen.

[@IDeserve]

Thanks!

[@jamesqiu6715]

I watch it again after almost 2 years, I have to say this video is by far the BEST algorithm on youtube ever!!!

[@IDeserve]

Hey James, welcome back!

[@hoelefouk]

You are so good that you could have come up with this algorithm on your own. Thanks!

[@IDeserve]

Thanks Nisheet for your kind words!

[@akilageetha5773]

Extra ordinary explanation of the mental modal behind Manacher's algorithm. The best of the best.

[@IDeserve]

Thanks Akila!

[@owenxu9173]

Great video. I have read some blogs about this Algorithm and still not understand.
Withi your explaination, it become clear to me! Thanks very much!

[@IDeserve]

+Owen Xu
Thanks a lot for your words! We are striving hard to make understanding algorithms easier.
We would really appreciate if you could spread the word about IDeserve in your college and to your colleagues.
Also please check out our website at: www.ideserve.co.in
It has features like algorithm visualizations, learn together and many more coming soon.
Please check it out and leave us a comment there!
Thanks,
-Team IDeserve.

[@kekaiskeka]

Excellent explanation for a complex algorithm. Minor correction of logic:
If condition after 'while' loop is going to run every 'i' values that are greater than R.
Example: 'ABABABACDEFG' try this as an example and check C and R values would change for i > 15 and overwrite C and R values to lower values. This will result in a wrong output.
So, this 'if' condition should check for P[i] should be greater than P[R] to change C and R to new values.
Replace
if(i + P[i] > R)
with
if(P[i] > P[R])
Thank you for the great explanation.

[@puneettanwar2325]

very clear explanation. Great work. Thank you!

[@IDeserve]

Thanks Puneet!

[@siteshp]

What an explanation sir. Keep it up. The best thing was you dry ran the code also with values, i didn't require even a pen and a copy to understand.

[@IDeserve]

Thank you so much for your kind words Sitesh!

[@chinmaiveera7586]

I've seen many top youtuber's tried to explain but only you succeeded.

[@BK-rs1we]

Great explanation. I feel if there were indices on P[ ] then it would be easier to follow when you went through the code.

[@kumarravi09]

Great Explanation. Probably the best i have come across so far.

[@yevgeniygrechka6431]

This is an excellent video. Just one suggestion for future videos: in the example that you went over, we never had the case where we had to take R-i over P[mirr]. It would be good for the example to include this case.

[@anxiousengineer]

I looked at some other explanations and yours is by far the best. Thank you so much!

[@IDeserve]

Thank you so much for your kind words Dario!

[@glorykim9171]

This was so helpful thank you! I appreciate all of the patience it took you to iterate through this.

[@IDeserve]

Thank you so much for your kind words Glory!

[@AshuAshuAshuAshu]

thank you so much, sir, you are great ......
I found a lot of videos on manchester's algo but all that was waste material.
you are a gem in terms of algorithms.

[@IDeserve]

Thanks Ashutosh!

[@danielwen1227]

Thank you a lot for your explanation! It is the video that is worthy to spend 24 minutes on it!

[@IDeserve]

Thank you so much for your kind words Daniel!

[@tombrady7390]

after rewinding and pausing crying finally it just clicked dont give up on this it is staple for palindromic problems

[@AnkurDwivedi75]

I have been trying to understand this algorithm, but failing .. thanks ..just a single watch here on ur channel, I have understood it completely

[@moa7ed99]

The explanation is really good and simple. But, where is the complexity video?

[@IDeserve]

Hey Mohammed Elrashidy,
If you would like to request a new video, here is the process: ruclips.net/video/3fQLOfuMfl0/видео.html
Thanks,
-Team IDeserve.

[@AshwaniSharma-of2nq]

I have watched other videos also. But your one made me understand it completely. Kudos to you buddy. Keep going.

[@IDeserve]

Thanks Ashwani!

[@iloveans]

Thanks for the extremely clear explanation! Tracing the code made it even better :)

[@IDeserve]

You are welcome Tyler!

[@elvis0305]

This is awesome explanation , the visualisation helps a lot with understanding the idea behind the algorithm! Great job guys.

[@IDeserve]

Thanks Li!

[@ganeshkumar269]

youtube recommended this, glad it did

[@IDeserve]

Thanks!

[@MadForCs16]

Best explanation On the INTERNET.

[@IDeserve]

Thanks Saurabh!

[@NishArcturus]

23:48 minutes used for the best man !! Thank you so much for this finally got this😂

[@IDeserve]

You are welcome!

[@simplysimple4890]

To those who have unliked this videos, "Are u people even humans?"

[@IDeserve]

Thank you so much for your kind words 😊

[@harmeetsingh9571]

Really great explanation. Watched couple of videos for this algo and yours is the best one. Very precise and your code walkthrough was awesome which made it complete. Appreciate your efforts in making those slides.
Your videos would be mine first goto from now.
Happy to share!

[@IDeserve]

Thank you so much for your kind words Harmeet!

[@gameelevator1579]

Sir you nailed it . Thank you so much for awesome explanation 🙂

[@IDeserve]

Thank you for your kind words! 😊

[@savanmatariya7494]

Awesome explanation, loved your work and effort. You actually deserve it!!

[@IDeserve]

Thanks Savan!

[@nightking6719]

best explanation found till now !!

[@aceorochi]

Awesome!
This is the most intuitive explanation, even people dull like me can understand the point of this algorithm now!
Nice job, looking forward more of your publish!

[@IDeserve]

+吴佩 It's really encouraging to hear comments like these. Yes we are uploading new videos on regular basis. So, stay tuned :-).
Please feel free to let us know if you would like us to upload a video for a particular topic/algorithm. We will really appreciate if you can spread the word about IDeserve(www.ideserve.co.in) in your peer circles.
Thank you,
Team IDeserve

[@forceinfinity]

Excellent presentation. Hugely helpful in understanding the algorithm

[@IDeserve]

Thanks forceinfinity for your kind words :)
We are striving hard to make understanding algorithms easier.
We would really appreciate if you could spread the word about IDeserve in your college and to your colleagues.
Also please check out our website at: www.ideserve.co.in
It has features like Algorithm Visualization, Learn Together and many more coming soon.
Please check it out and leave us a comment there!
Thanks,
-Team IDeserve.

[@ayushkushwaha262]

Spent whole day to understand this from other resources result ==> ~NULL
Spent time here understood in 2 go !!
Recommended!!
Thank you for the best explanation.

[@IDeserve]

Thanks Ayush for your kind words!

[@prudvinathmalepati3322]

Thanks man!! You are a good teacher. I got the central idea after watching your video once. Now, I can try coding it on my own.

[@IDeserve]

Thank you so much for your kind words Prudvinath!

[@mihirkumarsrivastava1895]

the best explanation of manacher's algorithm, great buddy it really hepled me alot

[@IDeserve]

Thanks Mihir!

[@rbt-0007]

Bro you saved my day with your wonderful explanation, definitely subscribing!

[@rajurajesh5566]

Watched more than 10 videos before this to get this algo tns bro❤

[@IDeserve]

Thanks Raju!

[@NaitikMishra-ll7el]

best video to understand Manacher's Algorithm.👍👍

[@IDeserve]

Thank you!!

[@IDeserve]

+Andrea De Domenico
Thanks a lot for appreciating! There are many more videos coming soon. Also, you can let us know any interview topic or question of your choice that you would like to see on IDeserve.
Thanks,
-Team IDeserve.

[@MrMalapatiravi]

I would recommend most of the difficult and medium level questions from leetcode and their principles.

[@aatishchauhan8957]

A really good explanation. Thanks for your hardwork man.

[@IDeserve]

Thanks Aatish!

[@aatishchauhan8957]

@@IDeserve Is the video on explaining the time complexity of this algorithm uploaded ?

[@ppantg1]

It's actually quite a simple algorithm once we become familiar with the concept. Basically, copying over the mirrors expansion length if the index lies within the current right boundary means we don't calculate the expand length from scratch at every index - we use the symmetric property of palindromes to give us a O(n) time.

[@skauddy755]

Crystal Clear Explanation.

[@IDeserve]

Thanks Sandeep!

[@tarunbawari2858]

Nice explanation sir, other youtubers video are little difficult to understand on this topic.

[@tejavemparala4377]

Great Explanation, no other video on YT does the explanation this way, I was looking for video like this. Eg: "what is making the brute force algorithm to run in O(n^2) and how it can be optimized"

[@IDeserve]

Thanks Teja!

[@jacobhubbard7337]

Great work. Best explanation I've seen yet.

[@IDeserve]

+Jacob Hubbard Thanks a lot for your words! It is very encouraging to hear such comments! We are striving hard to make understanding algorithms easier.
Please check out our website at: www.ideserve.co.in. It has features like algorithm visualizations, learning together and many more coming soon!

[@anirudhreddybasani3555]

These repetitive comments on how brilliant this video was tells us about this video...from my side I really appreciate your efforts :)

[@IDeserve]

Thanks Anirudh!

[@sayedsohel6913]

you have done a good job debugging the code. keep it up bro.

[@IDeserve]

Thank you so much Sayed for your kind words :)

[@prateekvats963]

Such a easy explanation, thank you sir

[@IDeserve]

Thanks Prateek!

[@shaivalchokshi3424]

Wonderful explanation, concise and apt :)
Helped me understand it till the depth. Great work, kudos !

[@IDeserve]

Thanks Shaival for your kind words :)

[@prashantgupta8801]

Awesome explanation. Thank you very much. Appreciate your efforts.

[@IDeserve]

Thanks Prashant!

[@shreyas6589]

Brilliant explanation! The visual explanation was indeed very helpful! Thanks a ton!

[@IDeserve]

Thank you so much for your kind words Shreyas!

[@harishh823]

following all your videos , all your videos are great inspiration, waiting for bit algorithms ..

[@IDeserve]

+HARISH H
Thanks a lot for your words! It is very encouraging to hear such comments!
We would really appreciate if you could spread the word about IDeserve in your college and to your colleagues.
Thanks,
-Team IDeserve.

[@tanmoydatta5724]

Awesome work man. Best explanation ever i have found on online.

[@IDeserve]

Thank you so much for your kind words Tanmoy 😀

[@shabbar0333]

very clear and detail explaination.

[@IDeserve]

Thanks Shams!

[@aries3690]

Absolutely amazing explanation, thank you so much!

[@IDeserve]

Thanks Aries!

[@lipsachhotray1021]

Thank you! Finally understood the algo!

[@IDeserve]

Thanks :)

[@samadeepsengupta]

Great Effort ... Truly Grateful sir

[@IDeserve]

Thanks Samadeep!

[@explorersagnik8522]

i tried understanding this for 3 days finally understood here thank you so much

[@IDeserve]

Thanks Sagnik!

[@ipshamohanty6682]

Great job!!...Looking forward for more videos

[@IDeserve]

Thanks for your kind words Ipsha!

[@randeepsingh6457]

simply and neatly explained. thank you.

[@IDeserve]

+Randeep Singh
Thanks a lot for your words! It is very encouraging to hear such comments!
We would really appreciate if you could spread the word about IDeserve in your college and to your colleagues.
Also please check out our website at: www.ideserve.co.in
It has features like algorithm visualizations, learn together and many more coming soon.
We are uploading new topics everyday.
Please check it out and leave us a comment there!
Thanks,
-Team IDeserve.

[@RichardFarmbrough]

Almost perfect explanation. Thank you.

[@IDeserve]

Thanks :)

[@GotUpLateWithMoon]

Thank you so much! There may be more viewers if you add "5. Longest Palindromic Substring" in your title!

[@IDeserve]

Thank You!