MrPaul_TUser's blog

Codeforces Round #739 (Div. 3)
By MrPaul_TUser, history, 3 years ago, translation, In English

Hello, Codeforces!

I'm glad to invite you to amazing (we've tried to make it such) Codeforces Round 739 (Div. 3) which will start on Aug/18/2021 17:35 (Moscow time). This round is my (MrPaul_TUser) second round a significant contribution to which was also made by MikeMirzayanov, BledDest, DK318, unreal.eugene, and geranazavr555.

The round contains 7-8 problems. The difficulties of the problems are expected to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating 1600 or higher, can register for the round unofficially.

The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round, it will be a 12-hour phase of open hacks. We tried to make really strong tests — just like you will be surprised if many solutions fail after the contest is over.

You will be given 7-8 problems and 2 hours 15 minutes to solve them.

Note that the penalty for the wrong submission in this round (and the following Div. 3 rounds) is 10 minutes.

Remember that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as trusted participants of the third division, you must:

  • take part in at least two rated rounds (and solve at least one problem in each of them),
  • do not have a point of 1900 or higher in the rating.

Regardless of whether you are a trusted participant of the third division or not, if your rating is less than 1600, then the round will be rated for you.

Thanks to powergee101, artsin666, WitchOfTruth, ivanzuki, God_Of_Code, mahade31, ashmelev, nooinenoojno, Gassa, _c_k_r_, Ahmed_Salama, iankury, Killever, ncduy0303, and Vladosiya for testing the round and improving tasks.

Good luck and have fun!

UPD Editorial

  • Vote: I like it
  • +250
  • Vote: I do not like it

Comments Comments (178)
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3 years ago, # |
  Vote: I like it +81 Vote: I do not like it
Lighthearted meme
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    3 years ago, # ^ |
      Vote: I like it +19 Vote: I do not like it

    Really the problems are so constructive

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3 years ago, # |
  Vote: I like it +5 Vote: I do not like it

Can't wait for the round!

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3 years ago, # |
  Vote: I like it -54 Vote: I do not like it

This round is clashing with ICPC Asia West Gwalior-Pune regionals!

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    3 years ago, # ^ |
      Vote: I like it -59 Vote: I do not like it

    Yeah if any postponement can be done then it would be great!

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      3 years ago, # ^ |
      ← Rev. 2   Vote: I like it +23 Vote: I do not like it

      There is a gift from Codeforces &

      Mike
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3 years ago, # |
  Vote: I like it +32 Vote: I do not like it

I hope this turns out to be my last rated Div 3 round!

`

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3 years ago, # |
  Vote: I like it +71 Vote: I do not like it

As a FT- TESTER , you know what to do.

I RECOMMEND
I REPEAT
I BELIEVE
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    3 years ago, # ^ |
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    Hopefully this round will be great.

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    3 years ago, # ^ |
      Vote: I like it +6 Vote: I do not like it

    I enjoyed the problemset and its awesome. Thanks a lot to all behind this div3.

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3 years ago, # |
  Vote: I like it +8 Vote: I do not like it

OOOH! 8 problems and 2 hours and 15 mins to solve them. I am very excited about this round. So thank you CodeForces that you didn't make me expert in the last round with a difference of 7 points from expert so I can participate in this contest officially.

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3 years ago, # |
  Vote: I like it +1 Vote: I do not like it

It is on pluses , cool !

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3 years ago, # |
  Vote: I like it +2 Vote: I do not like it

I know it's difficult for the problem-setters, but can you please postpone the contest by a day? We have our Asia West Gwalior-Pune regionals on 18th. I know, CF works differently but considering there are no contests within the next 5 days, I request you guys to please postpone. Please, we don't want to miss a div 3 round :)

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3 years ago, # |
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Good luck to everyone!

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3 years ago, # |
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Good luck to everyone!

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3 years ago, # |
  Vote: I like it +8 Vote: I do not like it

He tried his best to make the tester list palindromic xD

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3 years ago, # |
  Vote: I like it +32 Vote: I do not like it

Finally, as a tester

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3 years ago, # |
  Vote: I like it +5 Vote: I do not like it

I'm Pretty excited for my first unrated round ! :)

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3 years ago, # |
  Vote: I like it +10 Vote: I do not like it

8 problems so guessing first 5 will be cakewalk for majority of participants

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3 years ago, # |
  Vote: I like it +24 Vote: I do not like it

As a tester, I sincerely wish you all enjoy this round and get high ratings!

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3 years ago, # |
  Vote: I like it +8 Vote: I do not like it

Good luck to everyone!

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3 years ago, # |
  Vote: I like it +11 Vote: I do not like it

(Tester)_c_k_r_ orz

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3 years ago, # |
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In div3 do all questions have same score? Like A and F have same value upon solving?

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    3 years ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    Here the distribution of places is not based on points, but on the number of solved tasks and penalties for all tasks

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    3 years ago, # ^ |
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    Yes, this contest uses advanced ICPC rules. As far as I know, the only change is an 12-hour open hacking phase.

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3 years ago, # |
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Hope I stay cyan after this contest :) .

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3 years ago, # |
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Excited to participate in my First round :)

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3 years ago, # |
  Vote: I like it +2 Vote: I do not like it

Evening m'lady.

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3 years ago, # |
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I have come back to div3.

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3 years ago, # |
  Vote: I like it +3 Vote: I do not like it

CF Analytics Extension

https://chrome.google.com/webstore/detail/cf-analytics/hhljbjodjdbjbggddjaidojnlmaobcpo?fbclid=IwAR2CdKUrtNlHEwNB4Sxsv6VV0DqmkUXxfTTw1eCsclM3aYv-o_Q7l9eK0e4

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3 years ago, # |
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Finally a Div3 round .. i was waiting for it ...thanks all the authors and testers , today gonna be my first rated contest ..excited as fuck ..woooohoo .. love from hell

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3 years ago, # |
  Vote: I like it +5 Vote: I do not like it

i hope there will be no IN QUEUE this time , when u r in queue u waste time bcz u cant concentrate on the next question fully

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3 years ago, # |
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I hope I will get -100

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3 years ago, # |
  Vote: I like it +2 Vote: I do not like it

Hoping to change color this time :).

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3 years ago, # |
  Vote: I like it +13 Vote: I do not like it

Give me some sunshine, give me some rain, give me another chance to become pupil once again ;-;

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3 years ago, # |
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I hope there will be no "In queue" today :)

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3 years ago, # |
  Vote: I like it +2 Vote: I do not like it

If this contest doesn't work out well for me , I will wake up early for next week to practice daily.

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3 years ago, # |
  Vote: I like it -13 Vote: I do not like it

Where is vovuh ?

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3 years ago, # |
  Vote: I like it +1 Vote: I do not like it

Anyone else facing "Unexpected errors"?

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3 years ago, # |
  Vote: I like it +22 Vote: I do not like it

Nice problems!!! Keep up the good work.

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3 years ago, # |
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What does penalty mean?

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3 years ago, # |
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I solved D using Python and got TLE. Then submitted the exact same code in C++ and got AC. Is this right? I am new to this, but I thought it should not be like this

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    3 years ago, # ^ |
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    Python is slower mate, that's why people use c++ at all

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    3 years ago, # ^ |
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    that's okay, python is the worst programming language for sport programming then you need fast and low-memory-usage programs

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3 years ago, # |
  Vote: I like it +5 Vote: I do not like it

Amazing Div3 round. Well balanced questions. thanking all the problem setters of the round ^_^

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3 years ago, # |
  Vote: I like it +53 Vote: I do not like it

Digitforces :)

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3 years ago, # |
  Vote: I like it +13 Vote: I do not like it

I just wanted to thank you for setting problem E. One of the most beautiful problems I've seen from CF contests in a while. A problem solved after some cool ideas. Thanks, setters!

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3 years ago, # |
  Vote: I like it +16 Vote: I do not like it
problem F1 meme
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3 years ago, # |
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oh my god, I didn't expect to be able to solve F1 without knowing how to do D or E at all

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3 years ago, # |
  Vote: I like it +18 Vote: I do not like it

Problem E was really nice and interesting :D

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3 years ago, # |
  Vote: I like it +2 Vote: I do not like it

my F2

solve it 19 seconds before the contest ends....

the time limit is too strict....

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    3 years ago, # ^ |
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    Actually the only solution that came to my mind was the greedy one and that works pretty fast, just think backward and try to replace each digit and construct a valid number.

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    3 years ago, # ^ |
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    i did it in 5mins before. 700ms with optimisations :|

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3 years ago, # |
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E was MUCH easier than F1. Damn caseworks in F1. Everytime I got WA, I discover a new casework.

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    3 years ago, # ^ |
      Vote: I like it +14 Vote: I do not like it

    I am too young too simple.I thought F1 is easier than E...

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      3 years ago, # ^ |
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      I overlooked E and tried F1 cuz it had "Easy version" in it

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    3 years ago, # ^ |
      Vote: I like it +17 Vote: I do not like it

    F1 was trivial. There are only about 50000 possible numbers to construct. So you build them all and then solve queries trivally.

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3 years ago, # |
  Vote: I like it +8 Vote: I do not like it

What in the world is pretest 2 for F1 D: ;-;

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3 years ago, # |
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super ultra speedforce lmao

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    3 years ago, # ^ |
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    can't agree because I found problems challenging enough

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      3 years ago, # ^ |
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      I just want to say everyone solve problems so fast ^^

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3 years ago, # |
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How to solve problem D ?

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    3 years ago, # ^ |
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    you can iterate over powers of 2 with upper bound of 2^63 so 64 items to check: just check how many digits of k already fits into current power of 2, how many digits you should remove and how many digits you should add to get current power of 2. In the end choose min

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3 years ago, # |
  Vote: I like it +5 Vote: I do not like it

when u stuck on easy problem in div-3. life suc**d. :(

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    3 years ago, # ^ |
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    it's okay, not all problems from div3 are easy even for div2 participants, so be happy, your life is beautiful

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      3 years ago, # ^ |
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      Yes Life is Beautiful <3
      Ur 17 WA on F before AC is really inspirable sir..

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3 years ago, # |
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I coded a backtracking solution for F1 but sadly it was getting TLE. I think that the time limit was too tight.It was (10C2*10^4*2^9) operations which is rougly 2*10^8 operations and could pass in 2-3 secs.

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    3 years ago, # ^ |
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    I think that the time limit was too tight
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      3 years ago, # ^ |
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      I said that in the context of a backtracking solution. Obviously there could be other ways.Btw how did you solve it?

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        3 years ago, # ^ |
        ← Rev. 2   Vote: I like it 0 Vote: I do not like it

        I said that in the context of a backtracking solution.

        oh, okay!

        I solved it in the following way:
        Iterate from the last digit to the first digit. Say you are at the $$$i_{th}$$$ digit(from the end). If you can keep the portion to its left the same, change this one digit, and keep the portion to its right as small as possible within the given your constraints, this is your answer. If you can't, move on to the digit on its immediate left.

        My code, sorry it's quite messy: 126351416

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          3 years ago, # ^ |
            Vote: I like it +3 Vote: I do not like it

          Thanks for explaining your thought process will implement it.

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    3 years ago, # ^ |
    ← Rev. 2   Vote: I like it +1 Vote: I do not like it

    you dont actually need to check all possible choices for the two digits btw. In case if the number is not already beautiful, the answer's first digit would be the same as the first digit of the original number, then you can choose for the other number. that way your solution can be sped up by a factor of 4.5

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    3 years ago, # ^ |
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    Mine Backtracking passed the Pretests , you can have a look if you want .

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3 years ago, # |
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My best contest yet, first time solving A to E (Okay I know it's a Div. 3 but still).

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    3 years ago, # ^ |
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    I would think chess players of your level would do significantly better than this

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3 years ago, # |
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I rarely solve problems with 1000 solutions. But this time F1 was easy for me and I was very wonder to solve it. And I didn't get why there are so less solutions.

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    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Because lesser Blue and Purple Participate in Div 3 rounds compared to Div 2 , Many a times When people are unable to solve a problem ( this time Problem E ) and the contest is unrated people don't move to next problem .

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3 years ago, # |
  Vote: I like it +1 Vote: I do not like it

atol function (c++) wasted my 20 mins contest time.. -_- Problem - F1 — 126353303

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3 years ago, # |
← Rev. 2   Vote: I like it 0 Vote: I do not like it

Can anyone help me with this? I was using my Codeblock IDE to code, and I passed the first test case in problem F2, but when I submit my code in Codeforces, the output was different! https://codeforces.me/contest/1560/submission/126358147 Here's the image: https://postimg.cc/tZ133pW7

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3 years ago, # |
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Nice contest and cool problems, but i think that it has so many string ploblems, like D, E and F1/F2 (F1 and F2 are string problems too, rigth?)

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3 years ago, # |
  Vote: I like it +1 Vote: I do not like it

Bruteforces

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3 years ago, # |
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Can someone just explain to me how the answer to the test case in F : 1 1 2 answer is 1 ? isn't it supposed to be 10 ? because there's two different numbers in it.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Contest Admin MrPaul_TUser please take strict action against this guy _Utsav_85

Posting video solution during the contest which is violating Codeforces T&C Policy

The link to the Video solution

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    3 years ago, # ^ |
    ← Rev. 2   Vote: I like it -20 Vote: I do not like it

    good round

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      3 years ago, # ^ |
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      There is no sense of taking the video down now -_-

      You just took away some hard working guys actual standing from them

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3 years ago, # |
  Vote: I like it +14 Vote: I do not like it

Amazing pretests (especially pretest 1 (Especially for D and E)). I caught many edge cases where the code would have failed when in local testing itself. Thank you.

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3 years ago, # |
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Can anyone find a test case for my F1 solution 126364100 it failed in pretest 2 |_|

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    3 years ago, # ^ |
    ← Rev. 2   Vote: I like it 0 Vote: I do not like it

    Check this:

    1
555 2

    The output should be 555 instead of 556 in your solution.

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      3 years ago, # ^ |
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      Shouldn't it be 556 coz k is 2?

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        3 years ago, # ^ |
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        Check the statements. The number should contain no more than k different digits.

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3 years ago, # |
← Rev. 2   Vote: I like it +5 Vote: I do not like it
Problem F: Nearest Beautiful Number
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    3 years ago, # ^ |
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    Can't come up with an example for the less than K case, do you know any?

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      3 years ago, # ^ |
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      102 2

      102 to 109 will not work as it contains 3 digits.

      now we need to increase second digit 0-> 1 so 11_ and in this case it's already less than 2 so we add zeros. 110

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3 years ago, # |
← Rev. 2   Vote: I like it -51 Vote: I do not like it

Task C was impudently copied from the ROI: https://vos.olimpiada.ru/upload/files/Arhive_tasks/2020-21/school/iikt/tasks-iikt-9-11-sch-msk-20-21.pdf

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    3 years ago, # ^ |
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    Deleted.

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    3 years ago, # ^ |
      Vote: I like it +59 Vote: I do not like it

    Did you just accuse me of something? Trust me, simple problem ideas are often not new. That is life. And the coincidences are accidental. The problem was invented by me absolutely independently. And I don't think it's even a problem, but rather a programming exercise.

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      3 years ago, # ^ |
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      No, I wasn't trying to blame anyone. I just stated the fact, since many participants could just copy the code :(

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        3 years ago, # ^ |
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        No, I wasn't trying to blame anyone.

        you know what impudently means, right?

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    3 years ago, # ^ |
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    They aren’t even the same problem LOL, the grids are completely different. Just look at first row: 1-2-5-10 vs 1-2-9-10. Moral of the story is, Don’t accuse someone without looking carefully.

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3 years ago, # |
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I had solved D, but I did not account for the max length that n can have (apparantly upto 10^18). But foolish me, thought that this would not cross 10^11(worst case). It will cause my rating to drop (which is already low). I will be more careful in the future. It was an excellent problem.

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3 years ago, # |
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I am not sure what I am doing wrong here. If you find the mistake in my code please do tell me. 126357637

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3 years ago, # |
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I saw that in C many people are iterating to get in what range will the number lie and do calculations according to that. You can do this in O(1) by using the fact that sum of first N odd numbers is N².

My solution O(1) for problem C: https://codeforces.me/contest/1560/submission/126316175 Edit: it is not O(1) as pointed by some of the people in comments, I never bothered to look up complexity of pow function before.

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    3 years ago, # ^ |
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    your solution runs in $$$O(log \space k)$$$

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      3 years ago, # ^ |
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      Mine runs in O(1) 126374450

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        3 years ago, # ^ |
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        n = input.nextInt();
st = 1;
ct =1;
while(st < n){
    ct++;
    st = ct*ct;
}

        this runs in $$$\sqrt n$$$

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      3 years ago, # ^ |
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      Thanks for pointing it out, I'll edit my statement, I never bothered to look up complexity of pow function before, my bad.

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        3 years ago, # ^ |
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        pow(n,2) in your case works fine, $$$O(1)$$$.

        math.sqrt(K) runs in $$$O(log K)$$$

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          3 years ago, # ^ |
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          Can you tell the source of this info, from what I found on net, the complexity of math.sqrt() operation in python was given to be O(M(d)) where d is the number of digits

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    3 years ago, # ^ |
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    This is not o(1)

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      3 years ago, # ^ |
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      Thanks for pointing it out, I'll edit my statement, I never bothered to look up complexity of pow function before, my bad.

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        3 years ago, # ^ |
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        It might be O(1) hmm.

        Probably depends on how you define input size.

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3 years ago, # |
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thanks for Balanced round meoww

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3 years ago, # |
  Vote: I like it +3 Vote: I do not like it

So happy to give this round, From last 3 rounds I had seen failures but after doing around 300 questions, I was able to solve 3 problems, Sadly for C the time got over. :( :( :(

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3 years ago, # |
  Vote: I like it +19 Vote: I do not like it

video of hacking myself out of 7th

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3 years ago, # |
← Rev. 2   Vote: I like it +6 Vote: I do not like it

Image Link

Some people are really bad, using random id to Hard code a wrong case which is not pretest, and then hacking them with original id :'(

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3 years ago, # |
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I'd like to report a suspicious hacking attempt:

https://codeforces.me/contest/1560/submission/126379084

the source of the hacked with the hacker's are very similar, and the hacked submission has a special case (n=555), probably inserted there so it would be easy to hack (if you would know which submission to hack). No reasonable contestant would ever add such a case in their program.

the same happened here (by the same hacker on the same 'victim'): https://codeforces.me/contest/1560/submission/126362247, he added his own name in the hacked submission :)).

If this isn't conclusive proof of ''cheating'', then.. what would be a conclusive proof?

Edit: just looked at the comment that came before mine-- Is this "standard practice" in acm-icpc rounds :))?

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3 years ago, # |
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Can any one explain why this solution https://codeforces.me/contest/1560/submission/126384961 Got TLE ?

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    3 years ago, # ^ |
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    I would suggest try using vector in place of Set , Set has a good constant factor along with logarithmic complexity for almost all operations

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3 years ago, # |
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MakiseRintarou clearly designed their solutions to be hacked. Surprisingly, a user called FBI hacked each solution...

IDK man the cheating just gets too much at a point.

Second user I have found: abhishek_kira hacking Rahul_uzumaku. https://codeforces.me/contest/1560/submission/126382347 see k==122112 https://codeforces.me/contest/1560/submission/126381396 see convoluted if statement at the start

Third instance I have found. Again same user as second: abhishek_kira hacking alpha__Noone. https://codeforces.me/contest/1560/submission/126364309 see K==99 && n==989891

Fourth instance. Again same user: abhishek_kira hacking ash_cp. https://codeforces.me/contest/1560/submission/126361622 see n==989 && K==99

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    3 years ago, # ^ |
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    rishisgsits_22 also hacked all the solutions for gs0801it191068

    they put a missing testcase to hack them later

    https://codeforces.me/contest/1560/submission/126405273

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    3 years ago, # ^ |
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    hi,yes,i tried using this after i saw at least 5 guys doing the same thing,but guess what,as far as I understand it now,it only counts if you hacked someone who is higher in the score table than you,and if ou hacked someone lower than you,it doesnt affect your rating,thats why I used the acc which i created to prove my friend wrong,because he was saying that those solutions will get me extra points,right after i saw that those users who hadn't been participating in at least 2 rating rounds,wont be included in the final table,i used the acc because i had only one rating contest there,therefore,i wont be in the final scoretable,even with all that,i i only started making the solutions only after the end of the contest,so they wont affect anyone,i made 5 hacks on my acc,to prove my friend wrong,the 6 hack was on the guy,who i don't know,i just saw him hack the same user twice,and i wanted to make fun of him,hacking his solution faster than him(if you don't believe me,you can check it youself),but thanks for reacting,I'm really glad that there are users,who have the same opinion about hackers,that they should be punished,hope you understand that i made those hacks for fun,knowing that it won't affect my final standing,thanks for reacting and i wish you high rating

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    3 years ago, # ^ |
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    and yes,if someone with admin rights is reading this,could you please delete or ban the Bogdan_fake account,because i understand that it pissed off other people,that i decided to orove my point through hacks,and i would like to ban account Bogdan_fake ,so it wont be pissing off anyone else,thanks

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3 years ago, # |
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Thanks to this round! Enjoy this round very much! :)

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3 years ago, # |
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...

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3 years ago, # |
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Contest NAME Should be CodeForces MATH Round(Div 3)

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    3 years ago, # ^ |
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    If you don't like codeforces and it's contests get out of it simple :)

    I can see your performance in other non-math contests, so shut the f*ck up! You don't deserve rating, you know nothing bloody prick.

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    3 years ago, # ^ |
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    Well, there was some good string problems

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    3 years ago, # ^ |
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    I don't think so.Only Problem C is a math problem,and it is not difficult to work out. And some problems in this round are interesting,just like Problem F.

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3 years ago, # |
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My rating is 1194 .Still its showing unrated for me. But in bold word the contest rules said -

"Regardless of whether you are a trusted participant of the third division or not, if your rating is less than 1600, then the round will be rated for you." .

Its very disappointing as for the first time i might became pupil if i got rated this round. :(

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    3 years ago, # ^ |
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    In dv3/edu round, there have 12hours hacking period. so have to wait for rating change around 15hours from contest end bro.
    So wait a little bit more, already system testing end for this round.

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3 years ago, # |
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Why unrated?

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3 years ago, # |
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When will the ratings be updated?

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3 years ago, # |
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I like this round.Some problems are intersting,especially the problem F :)

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3 years ago, # |
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is this unrated coz ratings has not changed yet

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    3 years ago, # ^ |
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    I keep hearing we will have to wait a bit. I probably going to lose rating in this round so not keen on seeing the change really. :(

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3 years ago, # |
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Let me see how many down votes you can give on this comment!!

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    3 years ago, # ^ |
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    Hmmm, so utilizing human's tendency of doing exactly what he/she was told to do... :)

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3 years ago, # |
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Did this round go unrated ???

somebody please tell me...

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3 years ago, # |
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I have to say that div2 is easier for me than this.

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3 years ago, # |
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Finally I became pupil after a year of greyness

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3 years ago, # |
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Great Round! Thanks!

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