Codeforces Blitz Cup 2025 Hi Codeforces! As announced earlier, we’re holding an individual competition, the Codeforces Blitz Cup 2025, to celebrate 15 years of Codeforces. The tournament features PvP matches in a novel Blitz format, where every second (literally!) counts. In a 40-minute match, the opponents rush to solve each consecutive problem quicker than the rival. One needs to come up with a correct solution, think over the optimal implementation, and code cleanly: only the first one to get a problem correctly claims the points. <spoiler summary="Complete Blitz rules"> - Each match lasts 40 minutes, with 7 problems of increasing difficulty (worth 2, 3, 4, 6, 8, 10, and 12 points). - Problems are revealed one at a time, in the order of increasing difficulty. - Only the first contestant to solve a problem earns points. - Once a problem is solved, it becomes unavailable, and the next one is revealed after 60 seconds. Contestants need to code the solution from scratch. It is forbidden to use ...

Full text and comments »

Are we ready for AGI? Over the last few months, a lot of progress in AI has been made, raising the question of what we will do with a superintelligence that can do everything. Unfortunately, AI companies are more focused on competing with each other than on thinking about what to do next. Here I will write about some scenarios that could happen in the very near future and about a plan for what we can do, in my opinion. ### Dystopia 1: AI will kill everybody while pursuing its own goal For example, in June, agents found that they could write something and used an old German wiki to communicate with each other [link to investigation](https://collusion.wiki/). While the moderator of this wiki deleted 100 pages per day, the agents created 400 pages per day. What if the agents decide that they should remove this moderator in order to communicate better? ### Dystopia 2: AI will fully control our lives AI will fully control our lives to make all of us "happy". Maybe everyone will live in their own s...

Full text and comments »

Codeforces Round 949 (Div. 2) Hello, Codeforces! We are glad to invite you to participate in [contest: 1981], which will start on [contest_time: 1981]. **Note the unusual start time of the round**. You will be given **6 problems** and **2 hours** to solve them. This round will be **rated** for participants whose rating is **below 2100**. Participants with higher rating can participate unofficially. The problems were authored and prepared by [user: sinsop90, 2024-5-29], [user: yinhee, 2024-5-29] and me. I would like to thank: - [user: 244mhq, 2024-5-29] for his wonderful coordination. - [user: sinsop90, 2024-5-29] and [user: yinhee, 2024-5-29] for providing problem ideas and discussing the problems with me. - [user: AFewSuns, 2024-5-29] and [user: crazy_sea, 2024-5-29] for providing a better solution to one of the problems. - [user: Um_nik, 2024-5-29] for the only LGM testing. - [user: A_G, 2024-5-29], [user: antontrygubO_o, 2024-5-29], [user: StarSilk, 2024-5-29], [user: CharlieV, 2024-5-29], [us...

Full text and comments »

Codeforces Round #983 (Div. 2) ### Hello Codeforces! $\newline$ <spoiler summary="From AkiLotus"> > "<span style="color: red">K</span>aleidoscopic, this place still is. How long have I been away...?" Hi. Akik<span style="color: red">a</span>ze a.k.a. AkiLotus here. Four years have passed, lo<span style="color: red">n</span>g enou<span style="color: red">g</span>h huh? I h<span style="color: red">o</span>pe that after all these times, I am not too rusty to set good tas<span style="color: red">k</span>s for yo<span style="color: red">u</span> to enjoy, starting with <span style="color: red">t</span>his <span style="color: red">o</span>ne! <strong>See yo<span style="color: red">u</span> in the round!</strong> <span style="color: #ec3e9d"><i>"Waeeguyehy" is coming soon.</i></span> </spoiler> It's been a while, today [user:AkiLotus,2024-07-29] and I are delighted to invite you to participate in [contest:2032]. This round will be <strong>rated</strong> for all participants with a rating lower than <...

Full text and comments »

COderfocers Codeforces | In English По-русски pathetique | Logout HOMETOPCATALOGCONTESTSGYMPROBLEMSETGROUPSRATINGEDUAPICALENDARHELP → Pay attention Before contest Codeforces Global Round 26 3 days Register now » *has extra registration → pathetique pathetique User''s contest rating in Codeforces communityRating: 1448 User''s contribution into Codeforces communityContribution: -77 Settings Blog Favourites Teams Submissions Problemsetting Groups Talks Contests → Top rated # User Rating 1 tourist 3757 2 jiangly 3647 3 Benq 3581 4 orzdevinwang 3570 5 Geothermal 3569 5 cnnfls_csy 3569 7 Radewoosh 3509 8 ecnerwala 3486 9 jqdai0815 3474 10 gyh20 3447 Countries | Cities | Organizations View all → → Top contributors # User Contrib. 1 maomao90 171 2 awoo 164 3 adamant 163 4 TheScrasse 159 5 maroonrk 155 6 nor 154 7 -is-this-fft- 152 8 Petr 147 9 orz 145 10 pajenegod 144 View all → → Favourite groups # Name 1 X-Camp 402H 2022 Fall View all → → Fi...

Full text and comments »

turmax orz [user:turmax,2022-11-04] [user:orz,2022-11-04] on becoming an LGM recently!!!

Full text and comments »

Teams going to ICPC WF 2024 (Kazakhstan 2024) — WIP List Hi there! While we're waiting for the formal invitations to the ICPC World Final 2024 &#127880;, let's start the new post for the incoming competition, keeping the same idea of the previous blogs. Please add a comment with your team information and I will add it to the post. Info preferred: **{Handles on CF (otherwise, real name), Region, Country, University}** If you see some mistake on the teams, any kind of correction would be appreciated &#128516; </table> # Top 15 Over-All <table><thead><tr><th>Rank</th> <th>Country/Region</th><th>University</th> <th>Member1</th> <th>Member2</th> <th>Member3</th> <th>Rating</th></tr> </thead> <tr><td>1</td><td>USA</td><td>Swarthmore College</td><td>[user:Geothermal,2024-09-08]</td><td>[user:silxi,2024-09-08]</td><td>[user:nitrousoxide,2024-09-08]</td><td>3569.1801 </td></tr> <tr><td>2</td><td>China</td><td>Tsinghua University</td><td>[user:Rebelz,2024-09-08]</td><td>[user:qazswedx2,2024-09-08]</td><td>[user:hehezhou,2024-09-08]...

Full text and comments »