Codeforces Educational Round 101 | Screencast for Problems A to D

[@kaal_bhairav_24]

congrats on becoming "GM" @demoralizer

[@utkarshgupta9858]

I became GM on 1 nov btw, but thanks a lot :)

[@arunmalik6592]

@@utkarshgupta9858 Problem a Is this string ((((?) a regular sequence plz answer

[@sihabsahariar]

@@arunmalik6592 No it is not. But your test case doesn’t match the condition. ( and ) will be used in the test case for single time.

[@arunmalik6592]

@@sihabsahariar Thanks bro for clearing doubt

[@ratneshtiwary9607]

I love watching ur cast man!

[@priyanshagarwal2095]

thank so much for this brother and for problem D 1 2 3 4 5 6 7 8 .......n as you say will convert n to 1 by using 8 now covert 8 to 1 by just using 2 (not by 4 and then 2) it works for me

[@utkarshgupta9858]

Oh yeah n-4 + 6 + 3 = n+5, it would've worked... I didn't think of it during the contest

[@ParitoshPotukuchi]

Thanks a lot for B. I really understood the logic. Is this called prefix sums, beacuse I have heard this term used everywhere. Great that I came across your channel!

[@saitarund1617]

I'm up solving atleast 1 problem after understanding your solutions.I hope you will be providing solutions for upcoming contests as well.Thanks bro :)

[@RifatulIslam__]

Great explanation man💚💚💚

[@arvindpatel12]

Please one video on Sublime Text setup for CP for fast testcase run

[@amitkumaryadav7240]

What is happening in this case )?(? It will give yes But ans should be no

[@aniketdubey7363]

Thanks for the stream sir Sir how you come up with intuition so quick ?

[@abdurrahmansikdernayan5994]

" ?))) " is it possible to obtain RBS? your code is giving answer "yes". But how? ( A. Regular Bracket Sequence)

[@vamsiksk912]

Question says exactly one ( and )

[@uklukl4738]

Please explain Question E

[@adityaraj5200]

Wait Wait! How about this one: ( ( ( ( ( ? ? ) in this testcase, we have 5 '(' at front , 1 ')' at the end, 2 question mark, and also length is even(8) . But can we make it RBS?? Shouldn't ur code fail at this tc?

[@utkarshgupta9858]

Read the statement carefully, that testcase is not valid acc to the problem

[@harshitmakhija6817]

in the question it is given u have exactly 1 "(" and exactly 1 ")"

[@adityaraj5200]

OOOOOhhhh god , missed it by that much! I failed to interpret what that meant and thus couldn't solve it. Anyways thnx!

[@classcure9769]

@@adityaraj5200 same happened with me so i did it for all the cases xD

[@shristip519]

@@classcure9769 Yeah same XD

[@stevenaws201]

Great Video bhai..!!

[@rishabhmishra9611]

Hey how to create that test cases checker you have that looks cool and less messy?

[@utkarshgupta9858]

I'll explain that in the 5k subs special

[@kartikeyatripathi7378]

Can you share you template file?

[@umatjeet8012]

thanks for the stream

[@nishantjoshi167]

hey how to made cf site in dark mode.

[@utkarshgupta9858]

dark reader extension, sometimes the light theme hurts my eye

[@mohan-ri6ze]

Just Google how to turn on dark mode in (your browser)

[@ayushxstv]

Why don't u compete in div 1 contests ,instead of doing div 2 ,div 3 and educational rounds ,these rounds r not for u ... 😂😂

[@utkarshgupta9858]

I'll lose red immediately lol

[@aadershchaubey1399]

@@utkarshgupta9858 what is the minimum number of questions can a purple coder solve in div2 contest Means if I can solve questions till D then what are my chances to become CM

[@danilzashikhin3591]

@@utkarshgupta9858 noob I needed 5 rounds to lose the grandmaster title

[@utkarshgupta9858]

I just don't think that the real Eva would watch my videos, that's it

[@danilzashikhin3591]

@@utkarshgupta9858 I don't watch I only comment

[@Tarunkumar-om3hu]

App ye test cases kese run kar rahe ho

[@ANANDKUMAR-jk9yp]

How to solve the same question if the there can be any number of closing and opening brackets and not exactly one @demoralizer

[@utkarshgupta9858]

Greedily fill N/2 opening brackets as early as possible

[@classcure9769]

simple brute force will work like first try filling initial ? with ( so that there is no negative value in our sequence( '(' = +1 and ')' = -1) if there is negative value but no ? before it that means ans is "NO". Now after filling initial ? with '(' -> start the loop on sequence and check for every value that after this indices we have enough ? and ) to make the value 0 if not then ans = "NO" else ans = "YES"; actually i didn't read the exactly one '(' and exactlly one ')' so i did this ques with above method.

[@sudarshankundnani41]

thanks man!!!

[@ujjwalkumarray2332]

Your code would print yes for ((() but it's not rbs

[@learnwithme7750]

according to ques string will contain only one '(' and only one ')'

[@ujjwalkumarray2332]

@@learnwithme7750 oh sorry

[@devendrasingh4776]

Why in A answer is No if length is odd??

[@utkarshgupta9858]

Every open bracket has to close, so even length

[@arunmalik6592]

Problem a Is this a ((((?) a regular sequence plz answer

[@samarthraj2714]

no its not a RBS

[@arunmalik6592]

@@samarthraj2714 Thanks bro

[@arunmalik6592]

@@samarthraj2714 Bhai par bhaiya kai logic se tho ye hai RBS

[@samarthraj2714]

@@arunmalik6592 haan wo thoda confusing lekin ye RBS nhi h aur agr doubt h to apna mail do mai apna code bhej deta hu

[@utkarshgupta9858]

Read the problem again, that's not a valid input

[@kamleshjoshi2949]

Thnks man!!

[@ritik637]

Great

[@danilzashikhin3591]

Hi

[@AbhaySingh-kj6dn]

Bhaiyaa mere se do hi ho paaye is baar, thanks for the editorial.

[@vimal3405]

1st