me, and many other pupils are able to solve div2C, and with reasonable speed (i vary, and i will admit when i go fast it is a decently high placement, like top 2k, but that doesnt invalidate my question) but still struggle to even get out of low-mid pupil preformances. im just wondering if this has always been the standard or is because codeforces has gotten more competitive. the jump from div2c to div2d is decently big, at least algorithmically, so for solving a-c every contest to end up in pupil can be demotivating if i didnt enjoy solving regardless.

like bro the given test cases wont even work for my code so its kinda scary its either i get it first try (because im the goat) or i give up

guys I dropped from specialist I'm quitting codeforces

contest more like trolltest

I have nothing to live for anymore

hey im looking for any sort of website or something that can find a contest (div2) that two users have not had any submissions on so they can virtual contest it and 1v1 for a higher score.

i just got 11 rr thanks

bro im usually good at binary problems this d genuinely cooked me bro anyways how did you guys do i think i did pretty good at least in the beginning

I would like to thank the codeforces community for welcoming me back in with open arms. A month ago, I thought my status in this community would never repair, but I should have known better.

As a conclusion, I will lay down my civil duties of protecting the codeforces blogs from negativity towards the platform. I think the community has already shown there is no need for monitoring.

I hope to see this upwards trend in voting follow on my posts. I think it wont be long before I surpass Kevin114514.

BLESS UNCLE tourist

wait genuinely it says it fails test 4 but when I run it on test 4 manually it passes

359461785

Hello codeforces! A while back I presented myself with a challenge to build a random function from only random bits. However, in the process of doing so, I realized that not only was this much more difficult than I expected, I ended up wondering whether it is possible at all. So here's what I did and the challenges I faced before asking you for a solution:

Creating 1/powers of 2 is trivial, since flipping n coins can create 2^n random possibilities.

Similarly, the same thing would be possible with dice, for example flipping two die and then multiplying one dice by 6 and adding them together can yield a 1/36 chance.

This seems to be limited to the factors given though, a dice can create 1/12 or 1/18 as well, using mod.

I don't want to have to flip potentially infinite coins. So, I can't get a 1/8 chance and then reroll on an 8 to get a 1/7 chance.

I first attempted to use different flips of powers of two using the binary representation. For example, for a 1/7 chance I thought to flip 4, then 2, then 1 coin. However, it seems this distribution is not even, you have to play plinko to get 0 or 7.

So my next idea was to create a super large value from say 1000 coins and then divide to the value. Effectively a 1/7 chance but, not perfect either way. This just minimizes rerolls, since it minimzies the ratio when creating a 1/n chance since as a value k gets bigger 2^k % n is smaller relative to 2^k.

Apologies if this is a solved problem, or if this is a well known unsolved problem. This was on my mind for a while now.

i keep seeing it at the top of the div4 leaderboard on their e solutions

great minds must really think alike

whichever school in india they are learning from show me i need to learn from there

like after we all finish the div2 we could lowkey take a break and have a post div2 party on hypixel party games would be kinda tuff is anyone else down lmk your usernames

ign: w04h

i dont really get whats up with all the hype around this contest schedule i mean its alright but this isnt game changing. atcoder and usaco kinda already have set schedules and stuff but we kinda just do contests whenever so really no contest schedule will fix that underlying problem as its a temporary schedule.

idk if anyone has any stronger opinions comment them down.

bro please i cant do it this saturday or sunday can we move it to like 4 am tmrw pretty please. you are just trying to copy atcoder schedule but somehow made it worse.

usaco is miles ahead of us with their schedule

thank you MikeMirzayanov i love this contest schedule please make it always like this 2 contests this weekend and some upcoming ones lets go im waiting in days of excitement

im still making my amends to this platform this is only part of it

bro i couldnt solve p3 bc i used python i wanted to promote in contest q*k^2 tle last 6 cases. p2 took me like 2 hours and p1 was horrendous casework to get an o(1) solution but lowkey we gotta love it because USACO is our brother as forcers. idk folk how did you guys do i dont really feel like i won even though i gonna promote because i got fried regardless.

As a victim of newbie/pupil hate myself, I think I speak on behalf of all newbie/pupil that we deserve better. We are constantly ridiculed by the blue names, who think they are so much better than us, and constantly pitted against each other in the brutal wars known as contests. We must finally stand up against this. I am calling on all of codeforces to join the #oldbie movement to say that we were all once newbies. I have been constantly downvoted for no reason other than my rank, and I am finally through with it.

Hello codeforces. I know my return has been long awaited. I have recently noticed that my reputation among us is rather bad. I have taken a break from codeforces and have returned (after waiting for days in excitement for hello 2026). I realize that some of the things I have said are rather harsh and critical of the platform. I pledge to no longer speak bad about codeforces. In fact, I will now scout the forums for anyone speaking ill of this beautiful place we call home.

And please, if anyone has any comments on what I've said in the past, please comment it. I will address any previous controversies I have had now. I wish to one day be among the likes of Dominater069. I wish to become the greatest Tongan programmer, in both skill and loyalty to the platform.

You will hear of me and my journey to #1 Kevin. You and the rest of the elites can do nothing to stop my path to greatness.

do we deserve destruction. our brains are shrinking wtf are these contests bro. i solve a-c i get a stupid neg on c bc i decided to submit an n^3 algorithm and pray but that costs me 240 whole places guys can we fix speedforces please.

honestly the issue is that c problems are becoming too easy we need hard div2cs that majorly reward any pupils or newbies that solve them.

if you folk need any ideas to make contest problems hmu (only $100 per question dw)

goodbye 2025 was crazy am i right folks? lets talk about it in the comments.

looking for tutoring from an lgm? come dm me im open from 5pm to 7pm (i have to go sleep after)

brief introduction of myself:

tongan 13 yo

favorite color: blue

height: 4'6

sign: gemini

i just wanted to announce that i am the first lgm from my province of vavau! comments open for questions

ive been wanting to participate in good bye 2025 since ive joined (past two months) but under the current circumstances it looks like im gonna have to do it on my phone. do you guys have any tips for programming on your phone? currently im using usaco ide and gboard as my keyboard (i was having issues with swiftkey).

hey guys im gonna go pro one day now is your chance to give me an upvote and a star to claim your og ticket comment your name to secure yourself in codeforces history

i say this from my experience practicing, and not from my experience in contest. i do safer things in contest so im less likely to fail test case 2, and when i do, i will agree its almost always my fault. however, when i do problems outside of contests i frequently fail test case 2, and i would like to say this shiuldnt happen as frequently as it does. i see a lot of problemsetters make up for the fact their div2c is too easy and make it harder by testing for edge cases outside of test 1. this is not good problem design. a contestant should be able to get a good test from the given test case and not have to make their own and brute force verify it. obviously a contestant looking through the test case for an answer without reading the question should be given a hard time, but if i ended up not solving a problem or getting a neg because of a single edge case i missed in contest, i would be very upset. test one also shouldnt give people a false solution but ill refrain from talking about that here. i am open to any critism in the comments. im new, so if theres any idea you think im missing here please let me know.

someone just pull the trigger bro 6.7k place with a 59m D submission time (i was in physics class again i lowkey couldve done it faster)

$5.99 each temporary1

ive been doing codeforces for two months and ive only done one div4 and it wasnt even made by cry. when do i get my turn pops? we need a golden era for newbies and pupil alike to get to experience the true codeforces experience. i think div4s are really the only chance new people get at solving more than 2-3 questions in a contest, and the current drought of them we are experiencing is polluting (india) our lower rated participants in contests with cheaters. we need to build the next generation of forcers and we arent doing a good job with that.