Please read the new rule regarding the restriction on the use of AI tools. It applies starting from round 972. ×

cry's blog

Codeforces Round 971 (Div. 4)
By cry, 3 weeks ago, In English

Heyo Codefoworcers!

vgoofficial and I are very delighted to invite you to participate in Codeforces Round 971 (Div. 4), which will start on Sep/03/2024 17:35 (Moscow time). There will be $$$7$$$ problems, with one split into three subtasks, to be solved in $$$2$$$ hours and $$$30$$$ minutes. We encourage you to participate and hope you have fun, regardless of your division!

The format of the event will be identical to Div. 3 rounds:

  • 5-8 tasks;
  • ICPC rules with a penalty of 10 minutes for an incorrect submission;
  • 12-hour phase of open hacks after the end of the round (hacks do not give additional points)
  • after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated
  • by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer).

We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants.

Only trusted participants of the fourth division will be included in the official standings table. This is a forced measure for combating unsporting behavior. To qualify as a trusted participant of the fourth division, you must:

  • take part in at least five rated rounds (and solve at least one problem in each of them),
  • do not have a point of 1400 or higher in the rating.

Regardless of whether you are a trusted participant of the fourth division or not, if your rating is less than 1400 (or you are a newcomer/unrated), you may choose to participate rated or unrated.

We want to express overwhelming gratitude to the following orzosities for making the contest possible:

01100 00000 11000 10011 00111 01000 10010 01001 01110 10100 10001 01101 00100 11000 01011 00100 00000 00011 10100 10010 10010 10011 00000 10001 10110 00000 10001 00011

UPD: The round will be unrated, even though m1.codeforces.com, m2.codeforces.com, and m3.codeforces.com were functioning correctly. While there were issues on the main site (which lasted more than an hour), no participant was able to view the leaderboard, ask a question, or receive an answer.

Editorial

  • Vote: I like it
  • +303
  • Vote: I do not like it

»
2 weeks ago, # |
  Vote: I like it +39 Vote: I do not like it

As a testuwuer I can confirm this contest has W rizz and you will get ratioed.

→ Reply
»
2 weeks ago, # |
  Vote: I like it +27 Vote: I do not like it

As a tester,

- .... .. ... -.-. --- -. - . ... - .. ... .- -.. .. ...- ....- .. -. -.. . . -..
→ Reply
  • »
    »
    2 weeks ago, # ^ |
    ← Rev. 2   Vote: I like it +19 Vote: I do not like it

    As a testuwuer, I can read Morse at 10 words per minute.

    → Reply
  • »
    »
    2 weeks ago, # ^ |
    ← Rev. 3   Vote: I like it +19 Vote: I do not like it

    English version:

    Spoiler
    → Reply
  • »
    »
    2 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    THIS CONTEST IS A DIV4 INDEED

    → Reply
  • »
    »
    2 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it
    • .... .. ... / -.-. — -. — . ... — / .. ... / .- / -.. .. ...- / ....- / .. -. -.. . . -..
    → Reply
  • »
    »
    13 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    As a participant

    Spoiler
    → Reply
»
2 weeks ago, # |
  Vote: I like it -9 Vote: I do not like it

i wanna be a testuwuer one day uwu

→ Reply
»
2 weeks ago, # |
  Vote: I like it +18 Vote: I do not like it

As a testuwuer, I must say the problems are uWu

→ Reply
»
2 weeks ago, # |
  Vote: I like it +24 Vote: I do not like it

as a tester, Dominater orz

→ Reply
»
2 weeks ago, # |
  Vote: I like it +5 Vote: I do not like it

Noice! cry round!

→ Reply
»
2 weeks ago, # |
  Vote: I like it +4 Vote: I do not like it

As a participant, I want to solve max questions

→ Reply
»
2 weeks ago, # |
  Vote: I like it +12 Vote: I do not like it

As a tester, I like chipotle.

→ Reply
»
2 weeks ago, # |
  Vote: I like it +2 Vote: I do not like it

cry is the best! cry cry cry :)

→ Reply
»
2 weeks ago, # |
  Vote: I like it +5 Vote: I do not like it

Div-4 is my only hope for AK :) Good luck to all!

→ Reply
  • »
    »
    2 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    I hope to get AK too. Good luck to you.

    → Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    what does AK stand for ?

    → Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    As a newbie, I want to learn how to study CP. Plz let me know how I can contact with you in other communication channel like skype or discord.

    → Reply
»
2 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

best thing in month

→ Reply
»
2 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

maythisjourneyleadsusstardownard

what does this even mean

→ Reply
  • »
    »
    2 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    how did you decode it ?

    → Reply
    • »
      »
      »
      2 weeks ago, # ^ |
        Vote: I like it +3 Vote: I do not like it

      map the strings to decimals and decimals to alphabets (0-25)

      → Reply
»
2 weeks ago, # |
  Vote: I like it +18 Vote: I do not like it

Decoded message for the binary pattern at the end.

Spoiler

I wish you all good luck for div 4.

→ Reply
»
2 weeks ago, # |
  Vote: I like it +4 Vote: I do not like it

Three subtasks is crazy !

→ Reply
»
2 weeks ago, # |
← Rev. 2   Vote: I like it -10 Vote: I do not like it
Spoiler
→ Reply
»
2 weeks ago, # |
  Vote: I like it +5 Vote: I do not like it

As a tester, I confirm the problems are as good as cry

→ Reply
»
2 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

go learn unicode

→ Reply
»
2 weeks ago, # |
  Vote: I like it -13 Vote: I do not like it

I hope to reach Expert after this round!

→ Reply
  • »
    »
    2 weeks ago, # ^ |
    ← Rev. 2   Vote: I like it +4 Vote: I do not like it

    Can u give Div4 contest as a rated participant being a Specialist?

    → Reply
    • »
      »
      »
      13 days ago, # ^ |
        Vote: I like it +2 Vote: I do not like it

      no

      → Reply
      • »
        »
        »
        »
        13 days ago, # ^ |
        ← Rev. 2   Vote: I like it 0 Vote: I do not like it

        hey as you can see my rank i am newbie and as a newbie i am going to as a newbie question " will it be rated for me" will i get score?

        → Reply
»
2 weeks ago, # |
  Vote: I like it +3 Vote: I do not like it

One genuine question to cry, from where do you get such good emojis ?

→ Reply
»
2 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

gsrixiw mw hmz4 mrhihi OWO

→ Reply
»
2 weeks ago, # |
← Rev. 4   Vote: I like it 0 Vote: I do not like it

May this journey lead us starward.

what do u mean, lol?

→ Reply
»
2 weeks ago, # |
  Vote: I like it -22 Vote: I do not like it

As a testuwuer, I must say the problems are uWu

→ Reply
»
2 weeks ago, # |
← Rev. 2   Vote: I like it 0 Vote: I do not like it

May this journey lead us starward!

→ Reply
»
13 days ago, # |
← Rev. 2   Vote: I like it +1 Vote: I do not like it

Yay! Div 4 Round

What is this message at end?

Spoiler
Spoiler
→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Hope to get 1300+ rating

→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

best thing for me after dropping 216 rating in 4 contests and went back to pupil

→ Reply
»
13 days ago, # |
  Vote: I like it +16 Vote: I do not like it

am i the only one who did this?

int main(){
    string s;
    int g;
    while(1){
        cin>>s;
        g=0;
        for(char x:s){
            g=g*2;
            if(x=='1')g++;
        }
        cout<<char('a'+g);
    } 
}

maythisjourneyleadusstarward

→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

@cry fan here :) hoping to do well and excited for it!!!

→ Reply
»
13 days ago, # |
  Vote: I like it +3 Vote: I do not like it

One task in three subtasks? omg, I had never seen that before! I hope the contest would be amazing, gl&hf

→ Reply
»
13 days ago, # |
  Vote: I like it +5 Vote: I do not like it

dcode.fr my beloved

→ Reply
»
13 days ago, # |
  Vote: I like it +11 Vote: I do not like it

May as well join in on the brainrot fun!

As a uwuriter, I hope you do well and UwU the OwO out of this round :)

→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Good emoji.

→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

The binary code at end : May this journey lead us starward.

→ Reply
»
13 days ago, # |
← Rev. 2   Vote: I like it -16 Vote: I do not like it

Another cry contest? Do we remember this Div 2 C with bad score distribution? https://codeforces.net/contest/1998 Or this Div 3 D "counting is fun"? https://codeforces.net/contest/1996

For Div 4 guys out there, be careful. Assume it's speedforces, cry doesn't like creating solvable for your level problems.

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    The Div 3 problem just used some well known math, I think it was very doable. As a tester though, I'm curious how you'll react to this contest.

    → Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Please don't do cheating everyone. This discourage us.

→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

hmm, that's interesting

→ Reply
»
13 days ago, # |
  Vote: I like it -8 Vote: I do not like it

I am a skibbidi testewer

→ Reply
»
13 days ago, # |
  Vote: I like it +5 Vote: I do not like it

like to get luck!

→ Reply
»
13 days ago, # |
← Rev. 2   Vote: I like it +3 Vote: I do not like it

I am so excited about this div 4 Contest But, how come the Div 3 Round from yesterday not make me newbie I am still unrated And I solved a problem in it too

→ Reply
  • »
    »
    13 days ago, # ^ |
      Vote: I like it +3 Vote: I do not like it

    just wait for the system testing to finish, it should be over soon

    → Reply
  • »
    »
    8 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    It's been a long time And I didn't get a rating from that

    → Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

may this journey lead us starward

→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

"May this journey lead us starward." The binary code at last.

→ Reply
»
13 days ago, # |
← Rev. 2   Vote: I like it 0 Vote: I do not like it

MAY THIS JOURNEY LEAD US STARWARD

→ Reply
»
13 days ago, # |
  Vote: I like it +3 Vote: I do not like it

Cry Always make me Cry :(

→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Good luck everyone uwu

→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

I remember last time there way a monkey and you have made us cry on problem C, what is your plans now [fearful emoji]?

→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

is my cutie cutie cowontests ready yewet?

→ Reply
»
13 days ago, # |
  Vote: I like it +3 Vote: I do not like it

where is sum ??

→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

vgoofficial damn man that Display Picture hits hard :)

→ Reply
»
13 days ago, # |
← Rev. 2   Vote: I like it 0 Vote: I do not like it

cry oworz

→ Reply
»
13 days ago, # |
  Vote: I like it +1 Vote: I do not like it

About 5 years ago ratings used to start from 1500. In my first contest I solved one problem and my rating got reduced to 1430 something. "do not have a point of 1400 or higher in the rating", I have not been able to touch 1400 since then, am I not considered a trusted participant?

→ Reply
  • »
    »
    13 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    u are a trusted participant .. ur current rating needs to be <1400

    → Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Please make it easy i wanna be a specialist

→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

I hope to get at least 5

→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Hopefully no gpt solves

→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

If I became a specialist in last round and registered before will I be rated or not for this contest ........Cause when I checked the participant list I was not marked as unrated as *user_name is the sign for unrated participant

→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

been waiting for div 4. i am new here i try div 2 solved one question and after that no a single question i am able to make. Hope this one goes well.

→ Reply
»
13 days ago, # |
← Rev. 2   Vote: I like it +1 Vote: I do not like it

The Binary Code

Spoiler
→ Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

As a non-rated contestant, this is my first unrated round.

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    me too! Because I used the feature haha. No more farming on these comments

    → Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it +6 Vote: I do not like it

    Surprise! It's become an unrated round for rated contestants too

    → Reply
»
13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Cry is a rizzmaxxer this conetst got W rizz but me no attend so L Rizz (erm what the sigma).

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

oh skibidi round)

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

first time to unrate, wish to solve 6 problem

→ Reply
»
12 days ago, # |
  Vote: I like it +1 Vote: I do not like it

aiming for 0 solved

→ Reply
»
12 days ago, # |
  Vote: I like it +1 Vote: I do not like it

uwu

→ Reply
»
12 days ago, # |
  Vote: I like it +3 Vote: I do not like it

hope to become specialist in this contest

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

First unrated contest (⁠^⁠^⁠)

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Got busted in the last Div3 and now again rated for DIV4, expecting to reach cyan again.

→ Reply
»
12 days ago, # |
← Rev. 6   Vote: I like it 0 Vote: I do not like it

As a participant, orz BonTapHoa , nguyenkhangninh99 , lalid , huanjua , chikien2009 , Soab , Jackduy

→ Reply
»
12 days ago, # |
← Rev. 2   Vote: I like it -6 Vote: I do not like it

Can someone help mere here in these question of recursion i am getting error "Time limit exceeded on test 2" my code " ~~~~~

#include <stdio.h>

void tobinary(int n) { 
    if (n > 1) {
        tobinary(n / 2);
    }
    printf("%d", n % 2);
}

int main() {
    int times;
    scanf("%d", &times);
    
    while (times--) {
        int decimal;
        scanf("%d", &decimal);
        
        if (decimal == 0) {
            printf("0");
        } else {
            tobinary(decimal);
        }
        
        printf("\n");
    }

    return 0;
}

~~~~~ " I am not understanding why its happening. PLease help i tried ChatGPT already but his solutions are not satisfying or capping the input

→ Reply
»
12 days ago, # |
  Vote: I like it +3 Vote: I do not like it

where is your bro "Sum" as cry and sum :) ?

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

How to participate in the contest?

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

I think it will be a great round!

→ Reply
»
12 days ago, # |
  Vote: I like it +1 Vote: I do not like it

01100 00000 11000 10011 00111 01000 10010 01001 01110 10100 10001 01101 00100 11000 01011 00100 00000 00011 10100 10010 10010 10011 00000 10001 10110 00000 10001 00011

If we map 00000 with 'a' and 00001 with 'b' and so on

It translates to : may this journey lead us starward

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Only div 4 can save my ratings now ; learning and givng contests is surely good but it costs rating too without practising

→ Reply
»
12 days ago, # |
  Vote: I like it -7 Vote: I do not like it

I'll ak in 20 minutes.

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Hoping to solve 5 questions in this round!

All the best Prateek077

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it -18 Vote: I do not like it

    they made it unrated. dont know if they will do a div 4 again in few days .lets hope so

    → Reply
  • »
    »
    9 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    I Got 5, but unrated D:

    → Reply
»
12 days ago, # |
  Vote: I like it +1 Vote: I do not like it

Don't be upset bro. This contest just not for you.[problem:E= 111,122,133,000]

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

"MAY THIS JOURNEY LEAD US STARWARD"

Had to use chatgpt, lmao.

→ Reply
»
12 days ago, # |
  Vote: I like it -12 Vote: I do not like it

do not unrate plsssssss

→ Reply
»
12 days ago, # |
← Rev. 2   Vote: I like it -12 Vote: I do not like it

Div 4 contest after a month and it became unrated

→ Reply
»
12 days ago, # |
  Vote: I like it -12 Vote: I do not like it

give more time and do it rated pls

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

went unrated (insert crying emoji)

→ Reply
»
12 days ago, # |
  Vote: I like it +3 Vote: I do not like it

So wonderful round! I was top 2000, but it became unrated :(

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Solved a problem in 1.5 mins for the first time in my damn life, and they made it unrated :(

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it -10 Vote: I do not like it

    same ; i solved problem A for the first time this faster ; bad day :(

    → Reply
»
12 days ago, # |
← Rev. 3   Vote: I like it 0 Vote: I do not like it

Div.4 always suffer from poor performance? not the first time to occur that! so why to be unratted? An unsuccessful decision

→ Reply
  • »
    »
    12 days ago, # ^ |
    ← Rev. 2   Vote: I like it +10 Vote: I do not like it

    i agree that cf is always slow.. but today's condition was incomparable to any of the past contests..it was the worst today.. so it was correct to make it unrated ..

    → Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

What, unrated, well, (∩︵∩) bye, gonna search my waifu!

→ Reply
»
12 days ago, # |
  Vote: I like it +22 Vote: I do not like it

POV:

It's just one hour of
→ Reply
»
12 days ago, # |
  Vote: I like it -15 Vote: I do not like it

WHAT THE HECK IT IS UNRATED

→ Reply
»
12 days ago, # |
  Vote: I like it -8 Vote: I do not like it

Solved half the contest on m1.codeforces.com and gotta say, the minimalistic experience was quite refreshing :D

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    same ; first i though they blocked coz it showed that the admin has blocked the site and all.

    → Reply
»
12 days ago, # |
  Vote: I like it -12 Vote: I do not like it

I hate PROBLEM C!

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it
    Spoiler
    → Reply
»
12 days ago, # |
  Vote: I like it +15 Vote: I do not like it

Such good round but got unrated! I was prepared to do my best and reach Specialist. But codeforces became queueforces and then website crashed.

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

it was supposed to be my combeck round ;( as i was about to solve F it become unrated even though if it didnt crash i would have done much better

→ Reply
»
12 days ago, # |
  Vote: I like it -22 Vote: I do not like it

Is this unrated?

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

→ Reply
»
12 days ago, # |
← Rev. 2   Vote: I like it -9 Vote: I do not like it

Div 4 could be one of the only chances for noobs like me to get ratings improved.However,unrated.:( ......Hope for the next turn.

→ Reply
»
12 days ago, # |
  Vote: I like it -13 Vote: I do not like it

Codeforces server is Mike's phone.

→ Reply
»
12 days ago, # |
  Vote: I like it -9 Vote: I do not like it

Really wish it wasn't made unrated. Last div 3 contest went terrible, and I was hoping to give a comeback with this one. Bad luck :(

→ Reply
»
12 days ago, # |
  Vote: I like it +15 Vote: I do not like it

managed to solve 6 problems within 1.5 hrs for the first time!

→ Reply
»
12 days ago, # |
  Vote: I like it -11 Vote: I do not like it

was having the best performance of my career and then i heard "unrated" :(

→ Reply
»
12 days ago, # |
  Vote: I like it +12 Vote: I do not like it

very sad that the contest got unrated. Very fun questions

→ Reply
»
12 days ago, # |
  Vote: I like it +1 Vote: I do not like it

I could have gone back to specialist again if the contest was rated. This is just sad.

→ Reply
»
12 days ago, # |
← Rev. 2   Vote: I like it 0 Vote: I do not like it

it was a cute round , i hope it was rated

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

I'm surprised I solved D under pressure. I'm usually bad at geometry

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

please rate this round 😭

I didn't find anything unusual, div3/4 has been always slow and lagging due to large number of participant.

why unrated this?

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    today's condition was just worst.. thats's why

    → Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    For me, I was unable to access Codeforces for almost an hour, so I had to participate in the contest on m2.codeforces.com. I believe the downtime was long enough to warrant making the contest unrated. Of course, there were also queue delays in previous Div. 4 contests, but they were limited to the beginning of the contest and were usually resolved within 15 minutes.

    Apart from that, I feel sorry to hear the bad news, especially since the problemsetters must have worked hard to prepare for the contest.

    → Reply
    • »
      »
      »
      12 days ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      But you're not even an official participant. Honestly people taking part in the contest unrated should have less priority in the queue of submissions. You're not even doing it rated and it screws people that are actually doing it rated

      → Reply
»
12 days ago, # |
  Vote: I like it -11 Vote: I do not like it

Making the round unrated just for the sake of "speedforces" just doesn't make sense to me tbh. What matters more is someone who solves more problems will place higher than someone who doesn't. Also the situation is the same for everybody, so it doesn't affect much to whoever has the ability to solve more problems.

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it +3 Vote: I do not like it

    i dont think so...i think many of the participants could not even see the questions after 2 to 3 mins of the contest ... and it is not due to internet issue but the server was down so it was fair to make it unrated imo .. if it was after 2 or 1 and half hours then mayb making it unrated would have been unfair.. but the problem was from the very beginning

    → Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

who can tell me how to do E?

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    binary search the answer over the range (k,k+n-1)

    → Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    ternary search

    → Reply
  • »
    »
    12 days ago, # ^ |
    ← Rev. 2   Vote: I like it +9 Vote: I do not like it

    You can also reduce the equation to a quadratic formula (ignoring the absolute values)

    The minimum value must be near the vertex or the roots of the equation.

    → Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Binary search

    → Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it
    Spoiler
    → Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

in G1, isn't the idea just find the longest consecutive subarray in the interval $$$ [l, r] $$$ and then answer for that query will be $$$ k - x $$$ where $$$ x $$$ is the length of longest increasing consecutive subarray. I was solving that with segment tree and some dp precalculation. Even my stress test couldn't find anything wrong.

brute force for stress test

Submission link

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it +23 Vote: I do not like it

    Here is a counter example:

    let $$$A = [1, 0, 3, 0]$$$. Clearly, the longest consecutive subarray here is 1, so your solution would produce $$$4 - 1 = 3$$$.

    However, let $$$A_2 := 2$$$ and $$$A_4 := 4$$$, then we can create a consecutive subarray with only 2 moves.

    → Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it +4 Vote: I do not like it

    consider this example:

    [1, 2, 10, 11, 12, 6, 7]

    the answer for this array is 3, because using 3 operations, I can change the array into the following:

    [1, 2, 3, 4, 5, 6, 7]

    Whereas based on your reasoning the answer is 4.

    → Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Contestants who solved problems: "i won but at what cost?"

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Stressforces, I found that my C code was wrong 30 minutes after submitted.

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Anyone who solved E in O(1)?

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    yes

    Spoiler
    → Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

I am greatly humbled by this round. I usually try solving at least more than 4 questions in Div3, and 3 in div2. First time getting stuck at Div4 barely at 2nd question. I guess I need to stop practising 1400s and go back to 900s and 1000s.

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Today's C was very Sketchy not like usual Div4 C, so dont worry

    → Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

I didn't gacha Yunli so I can't solve G. So reasonable.

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

I cannot submit code to practice after contest ends?? Just gave up after it became unrated, want to practice now.

→ Reply
»
12 days ago, # |
← Rev. 2   Vote: I like it +7 Vote: I do not like it

Cf really need to ramp up their scalability

Edit: Problems were really good. I enjoyed solving G1 and G2 a lot (though solved G2 just 5 mins after contest ended )

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it +3 Vote: I do not like it

    Or Thanos should snap his fingers one (or even two) times to drastically decrease the number of participants :)

    → Reply
»
12 days ago, # |
  Vote: I like it +3 Vote: I do not like it

Regardless of this contest being unrated, it was an insightful contest with an interesting set of problems!

I enjoyed the problems very much!!! thank you problem setters.

→ Reply
»
12 days ago, # |
← Rev. 2   Vote: I like it 0 Vote: I do not like it

"MAY THIS JOURNEY LEAD US TO A REWARD" cry,cry,cry

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Ok who is it that plays osu!mania?

→ Reply
»
12 days ago, # |
← Rev. 2   Vote: I like it -14 Vote: I do not like it

Please don't host div4 anymore if it can't handle such a large amount of participants :(

(the problem set was nice though)

→ Reply
  • »
    »
    11 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    People down-voting clearly don't get it. Guess what, just after I received the notification saying the contest is being made unrated, the platform became completely accessible to me. Before that I couldn't even open a problem on the mirror sites. The amount of traffic the platform faces during a Div 4 Contest is pretty huge. Let's make it clear — several people in the organizing team are putting their efforts to bring a good Div 4 contest. If all of that goes to trash due to queue issues, it's better to host them only if the site can handle high traffic.

    → Reply
»
12 days ago, # |
  Vote: I like it +2 Vote: I do not like it

Cryforces

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

WaitForces

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

System testing is taking too much time :(

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

satyam343 loves math.

→ Reply
»
12 days ago, # |
  Vote: I like it +3 Vote: I do not like it

i think you could still make it rated considering the fact that even if the main site worked poorly,m1 m2 and m3 were fine so you could still get around it. SO PLEASE GIVE RATINGS thanks:P

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    no they weren't working well also the whole site wasn't working

    → Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

When will I be able to virtually participant in this contest? The contest ended almost 2 hours ago, and the system testing is also showing 100%. How much do I need to wait for that?

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

when can I submit in practice , it is still showing system testing 100%

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

just after the contest got unrated suddenly every one is getting the best performance in his whole live and would have got grandmaster if it was rated :)

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Can someone please hack my Problem E solution?

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

why is there a hacking phase if its unrated? I´m not judging Im just curious

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Can someone help me find what was wrong with my problem C solution? I just couldn’t find what I did wrong even after looking at the editorial. Submission #279601674

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it 
    #include <iostream>

using namespace std;

int main(){
    int t;
    long long int x, y, k, xstep, ystep;
    scanf("%d", &t);
    for(int i = 0; i < t; i++){
        scanf("%lld%lld%lld", &x, &y, &k);
        xstep = (x - 1) / k + 1;
        ystep = (y - 1) / k + 1;
        if(x == 0 && y == 0){
            printf("%d\n", 0);
        } else if(xstep > ystep){
            printf("%lld\n", 2 * xstep - 1);
        } else {
            printf("%lld\n", 2 * ystep);
        }
    }
}
    → Reply
    • »
      »
      »
      12 days ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      I think the problem is that you are performing integer division you should make k a double or multiply by 1.0 or what ever to make the division correct

      → Reply
    • »
      »
      »
      12 days ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      Fails on input x = 1, y = 0, k = 10

      Use (a + b — 1) / b for ceil(a/b)

      → Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Really ?? That’s not first time, every contest div4 the site can’t be loaded and shutdown Cryforces

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

what would be the 862 test case of c number problem..??

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

I think this contest should be unrated for people who where to get negative score,and the rest get their deserved points but in a lower rate

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

I feel there is no herm in putting 1 or 2 hard problems as the final tasks in every round. Which’s beneficial for both unrated as well as rated participants. Unrated participants would have something to think of rest of the contest and rated would have something to upsolve :)

My personal opinion
→ Reply
»
12 days ago, # |
  Vote: I like it +9 Vote: I do not like it

Guessed difficulty

A — 800

B — 800

C — 800

D — 1000

E — 1100

F — 1400

G1 — 1800

G2 — 2100*

G3 — 2700**

*I did not seriously look at G3 at all.

**I did not solve G2, but I understand the solution based on the editorial, and kind of figured it out, nut I suck at segtrees.

→ Reply
»
12 days ago, # |
  Vote: I like it 0 Vote: I do not like it

I would have gotten +70 delta if this contest was rated...

→ Reply
  • »
    »
    11 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Nope, the announcement was made and I choose to stop solving since that point (I think there's many people choose the same). But tbh ur speed in this contest is good so it's kinda unlucky.

    → Reply
    • »
      »
      »
      11 days ago, # ^ |
      ← Rev. 2   Vote: I like it 0 Vote: I do not like it

      Yep that's true for me.. i stopped after the announcement was made (somehow was able to submit D after the server was stable for a moment then i stopped)...i was not able to see the questions even.. and after 2 mins of the contest it was a chaos for me..ofc most of us would have performed much better if the server was not down ..tho i will still get plus delta as many people didnt submit due to this lag but making it unrated was fair enough... don't know when will i get the next div4 contest again for a positive delta :)

      → Reply
  • »
    »
    11 days ago, # ^ |
      Vote: I like it +3 Vote: I do not like it

    I didn't even see the announcement (

    i use m2

    → Reply
»
12 days ago, # |
  Vote: I like it +4 Vote: I do not like it

unrated?

→ Reply
»
12 days ago, # |
  Vote: I like it -12 Vote: I do not like it

i think you could still make it rated considering the fact that even if the main site worked poorly,m1 m2 and m3 were fine so you could still get around it. SO PLEASE GIVE RATINGS thanks

→ Reply
  • »
    »
    12 days ago, # ^ |
      Vote: I like it +18 Vote: I do not like it

    Nah, the moment it is announced unrated, there is no turning back, because at that point some people would stop caring about competing and not participate at their full capacity anymore, or even quitting the contest

    → Reply
    • »
      »
      »
      11 days ago, # ^ |
        Vote: I like it +3 Vote: I do not like it

      Agree. When it is announced unrated,I just give up keep writing code and just go to sleep lmao.

      → Reply
  • »
    »
    11 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    My conest was severely laggy the entire time, with even the m1 m2 m3 code forces sites not loading. However, I still was able to solve ABCDE, under some of the worst conditions. Please make this contest rated

    → Reply
»
11 days ago, # |
  Vote: I like it +3 Vote: I do not like it

I learnt a lot during this contest even though I cried due to speed.

I will do my best on your next contest.

Thanks cry

→ Reply
»
11 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Like come on we suppose to be learning problem solving, which includes knowing what to do when server is down but there are other fully functional sites, ugh i guess there is no other choice :*)

→ Reply
»
11 days ago, # |
  Vote: I like it -15 Vote: I do not like it

I hope this contest would be rated

→ Reply
»
11 days ago, # |
  Vote: I like it 0 Vote: I do not like it

I solved G1 with segment tree and sliding window

279788103

→ Reply
»
10 days ago, # |
  Vote: I like it 0 Vote: I do not like it

May This Journey Lead Us Starward.

→ Reply
»
10 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Is it allowed to use internet resources during contest like chatGPT? If so what if many people use the same sources during the contest does this come under plagarism?

→ Reply
»
9 days ago, # |
  Vote: I like it 0 Vote: I do not like it

The one time I was able to give a good contest and it became unrated :')

→ Reply
»
9 days ago, # |
  Vote: I like it -9 Vote: I do not like it

I become atleast (master) if random madafka chinese didn't ate bat in 2019

→ Reply
  • »
    »
    4 days ago, # ^ |
    ← Rev. 2   Vote: I like it 0 Vote: I do not like it

    Downvote comments does not change reality

    → Reply
»
9 days ago, # |
  Vote: I like it 0 Vote: I do not like it

G2
Solution using Suffix sums by Precomputing lesser values to the right [ONLINE]: 280036192
Solution using Mergesort Tree[ONLINE]: 280017871
Solution using Square Root Decomposition[OFFLINE]: 280049782

→ Reply
»
9 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Test 1.

→ Reply
»
8 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Fact: Old contest contest authors and coordinators aren't creative and good enough (not all of them 1 of 10 could be good) all of problems look same an array and some operations, and some other same problems problem A, B and C in most of contests are greedy, constructive algorithms and sometimes number theory

I have many accounts and I compete in many contests and looks since many years contests quality are getting worse why anyone never talks about it?

→ Reply
»
8 days ago, # |
  Vote: I like it 0 Vote: I do not like it

yay

→ Reply
»
6 days ago, # |
  Vote: I like it 0 Vote: I do not like it

English

→ Reply
»
6 days ago, # |
  Vote: I like it 0 Vote: I do not like it

pickme

→ Reply