Prefix Sums - Problems, Code in C++ & Python

[@mihiradarsh7604]

Finally he is here👏👏

[@kartikeysingh8376]

Long time no see happy that you are back 🙂 please make videos continuously ,it helps a lot

[@caiodavi9829]

no way!!! i was looking for this video last week, but i saw you had not uploaded in a long time… what a nice timing. welcome back, errichto!🎉🎉

[@tle-dewcodes7166]

Finally Errichto remembers, That he has a KZbin channel😅

[@GospodinStanoje]

Thanks for posting again! I really appreciate your videos. Your voice is calm and you're gifted in explaining it simply. Greetings from Serbia.

[@coldxwave]

Glad you're back!!!

[@atifayaz3495]

0:00 What is prefix sums? 4:31 Problem 1 : Static range sum queries 7:09 Problem 2 : Most common character in the substring 15:41 Problem 3 : Array manipulation 🤯 18:49 Summary

[@ivan0kurnia]

This should be on top!

[@jlecampana]

Your lectures are fantastic, just the right amount of theoretical foundation and then a code dive-in, very well done, keep 'em coming Mr. Errichto!

[@TheBackendDeveloper-b6t]

Finally you are back , i used to watch your videos when i eat food , finally again some great content . Love you man ....

[@detective1723]

He is back!🎉

[@malekissa1771]

We missed you so much

[@sachinkahawala7764]

Errichto is back! ❤️

[@amreezkhan5530]

He is backkk🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉❤❤❤❤

[@akramelomrani8728]

Errichto remembered his gmail password at last.

[@blagojrs]

The legend's back!

[@sharp615]

The man himself is back at it again. Nice to have you back

[@abd0-omar420]

I watched the binary search video and solved the problem you mentioned and more, and I will try to do that on this one again, and soon I will watch your dynamic programming series and solve them. Thank you so much for your guidance and I hope you upload more because they are great and straightforward

[@zanies6288]

If you are really interested in learning and have some free time. You should watch videos (previously recorded livestream) from Colin galen and Vivek gupta.

[@abd0-omar420]

@@zanies6288 thank you so much for the recommendations, I really appreciate it and I will grind to solve and learn from them

[@tetrreter6548]

it's too time to see you again 🎉 I'm so happy ❤

[@DrKeK-gh6sm]

Thank you so much errichto, i was just looking for prefix/suffix sums for the last few days

[@inde_t]

still haven't studied 2d prefix sum because i've been waiting for your video

[@mahadihassan1342]

Finally he is back after a long time 😊.

[@abc_cba]

Miss your content. I wish you come back. Best wishes from India

[@abd0-omar420]

Thank you for sharing this video! Your demonstration of the algorithm is amazing and straight forward with easy and hard problems, couldn't ask for a better video, thank you!

[@mahmoudel-hawawshy5198]

Thank you for posting educational content, I am really grateful and sure that most people appreciate your content so much too. please keep posting whenever you can, Thank you again!

[@vesperflix2211]

the way you teach is perfect

[@goldenlin9528]

Welcome back, glad to see u posting again

[@haxortaxor8736]

man im so happy you are back!

[@iceman4404]

The chosen one is back

[@ADITYAKUMAR-tb4gm]

Heyyy, very nice to see you back. I've learnt so many stuffs from you

[@rimurusama5070]

Loved to see your content once again. Thanks you so much.

[@Jeggettmega]

Thanks for the video! That type of content I find the most useful.

[@abdullahsaid4765]

welcome bruh I'm happy to see you long time no see

[@shiva_singh1700]

Good to see u back😊

[@rajmittal5394]

Legend comes🎉🎉🎉

[@AryanshTripathi-m4v]

Glad to see you're back🤩

[@rodhash]

wow you are back! we missed you bro

[@awgzmp]

Does anyone know what does: *ios_base::sync_with_stdio(0);* and *cin.tie(0);* mean?

[@Errichto]

In short, it makes cin/cout faster.

[@therealpancake7140]

@@Errichto Is it actually any better than using scanf() and printf()? I've done some testing myself and found that cin/cout with the boost are faster but I've also found conflicting results on the internet. What's your experience with the two approaches

[@piaIy]

​@@therealpancake7140 streams work with std::string, which makes them easier to use.

[@Algorithmswithsubham]

happy to see that you are so back

[@jasveersingh01]

The legend is back guys.❤❤❤❤❤❤

[@sakibsidha]

LET'S GOOOOOO! LOOK WHO'S HEREEE

[@sepehr__byt]

I'm glad to see you again

[@yevengyklaus7066]

The myth the man the legend.

[@MehbubulHasanAlQuvi]

After long time!

[@jenwans3055]

Welcome back man 🔥🤜

[@madsbdkerchristensen9597]

Love your videos, was hoping you would post again soon :)

[@juancastaneda5062]

Excellent that you get back....¡¡¡¡¡¡

[@nilu-bp6mv]

very happy to see you 😊❤

[@AdityaM-i7l]

Top G is back 😌

[@akashkishoremukhia7888]

Keep on teach us erricto.🔥🔥

[@rifatchowdhury3683]

Finally,,,, After A Long Time❤

[@shail_]

Thanks for the fantastic content!🌻

[@rahuldasari1886]

Pls make some more videos like this Thank you

[@DevChannel-b4i]

I have a couple questions about CP, let's assume someone practices very hard until they reach IGM level on CF, after that, how many hours a week would be necessary to just maintain the acquired level? Would just participate in weekly contests be enough?

[@OrifxonHusanov]

Legends never die!🙂

[@UltraKillpc]

The best tutor

[@karangarg7004]

Thank you so muuch for all of this!!❤

[@Grainme47]

yeah same request : Please make more videos :)

[@pj-nz6nm]

After a long time.

[@lkdk-m7g]

In the last problem can we just put a if statement that adds x if i is in range l to r please correct me if i am wrong And also as some one who just cp is a2oj a good resource or should i do something else also

[@Errichto]

If you do it separately for each of Q updates, the total time complexity is O(N*Q), which is too slow. a2oj is ok as long as you solve problems that are difficult enough for you.

[@lkdk-m7g]

@@Errichto Thank you very much for your guidance 👍😊

[@Liux2040]

Finally!!! I missed you😅

[@ayush_sccg8674]

I guess you will be uploading about algorithms now that's gonna be good

[@DrFranzovic]

hello errichto i am currently on a search for a new laptop for CP and i wanted to know if you got any advices for choosing the right one?

[@TheViral_fyp]

Brother can you recommend me which book r best for DSA and competative programming. Ik practice is the key but please recommend me 😊

[@sheanemario3909]

doesn't it better if we store our a[I] 's starting from 1. I mean skip 0 th index and store them in the array starting from the 1st index

[@irvin1241]

long time no see😂

[@spideyboy3587]

What's the device that you are using to write in screen ? Can you please answer.

[@ashwani_kumar_rai]

He man thanks please be regular

[@khanhuynh9628]

I love this video

[@milanboroja7094]

Hi from Banja Luka

[@theAZ1X]

Good day Errichto! I have question. ( 10:00 ) at the 7 line : s is string s.length() = s.size() ?

[@zanies6288]

Yeah same thing

[@alkhawarizm780]

sir please made a video for setup far manager

[@aisha9763]

Hello kindly hear guys , this is stay-at -home mum , Could I ask for C++, which laptop or computer required? Which one is best ? Which application or soft need to install ( now we use Mac) - thank you so much for your assistance.

[@aisha9763]

Good-hearted guys

[@adib7143]

@aisha9763, I don't use mac but hope this helps kzbin.info/www/bejne/Z3bCnHWJoMaSm8Usi=H77gcqle7X-EVWOy

[@Moch117]

Does this method work for suffix as well , where we use an array of size + 1? I ran into some errors

[@stati5tik]

first problem is basically what integral images are about.

[@abrarmasumabir3809]

Where did you set pref[0] = 0. Sorry if it is stupid to ask!

[@SadriddinDusanov]

raxmat bro

[@PeterGriffin_1920]

Long time no see

[@VP-es6wy]

Will you be posting regularly?

[@georgedrooj8800]

Finally 😍😍😍

[@lazyemperor5182]

More videos please

[@TheJohnniePlays]

Can you make a tutorial on problem solving. Like picking a harder problem and showing how to come up with some initial observations and ideas and work trough them to come up with a solution. A lot of times I just end up with a blank screen having difficulty even understanding what the problem is about.

[@Errichto]

I have hundreds of videos & streams about problem solving across my two channels. I rarely solve anything without explaining the thought process. If you want to see me struggle for hours, see any Atcoder Grand Contest streams like this one kzbin.info/www/bejne/i3vVq5qgl9GAea8

[@TheJohnniePlays]

@@Errichto This is it. Thank you.

[@oximas-oe9vf]

why dont we just go through the range form a to b and up the elements instead of summing from 0 to b then from 0 to a and taking the prior minus the latter?

[@hassanali-il3rk]

can i ask hint to hackerrank problem?

[@SabarMohamed]

It's been a while 😭

[@nightsusmare8468]

polska gurom

[@ingcivil-upm]

more videoss please

[@lazyemperor5182]

More edu videos please

[@elghalib2209]

still waiting for 2d prefix sums :(

[@AsherDMckoy]

Do you still do tutoring?

[@Errichto]

I do. You can find my email id in the "About" section on KZbin.

[@WanderArc18]

✨💫

[@kartik4792]

3 views 13 likes!

[@richardharris202]

😶‍🌫️✨

[@guszkiewiczkrzysztof4438]

dawaj tyeraz po polsku

[@mirza5635]

Eat burger

[@camperjett]

Can this comment get pinned?

[@quocanhhbui8271]

the legend is back!