Блог пользователя MikeMirzayanov

Автор MikeMirzayanov, 4 года назад, По-английски

Hello, Codeforces.

Unfortunately, we have to declare the round unrated.

Absolutely, these are not issues of the side of Codeforces code, but rather it is a hardware issue. Probably, electricity, power unit or something else. This led to unexpected repeated reboots of the server with the database. I hope that we will be able to quickly deal with this.

We apologize to the writers of the round and its participants.

P.S. Please, do not downvote the round announcement: the writers are not to blame for what happened. And in general, this time it is difficult to blame someone. Sometimes hardware fails.

Mike.

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Автор MikeMirzayanov, 4 года назад, По-английски

But why not!

Many people here seem to know me. Or maybe not quite? I am ready to answer your questions. Ask me anything! I plan to spend no more than 3 hours on answers. Sorry if I can't answer all the questions.

Let's more or less follow the rules from here https://www.reddit.com/r/IAmA/wiki/index

Below is actually a quote from the rules.

The interviewee begins the process by starting a post, describing who they are and what they do. Then commenters from across the internet leave questions and can vote on other questions according to which they would like to see answered.

The interviewee can go through and reply to the questions they find interesting and easily see those questions the internet is dying to have the answer to.

Because the internet is asking the questions, they're going to be a mix of serious and lighthearted, and you'll find yourself sharing all kinds of things you won't find in a normal interview.

Comments will be removed under a few circumstances:

  • Abusive or harassing comments.
  • Requests for personal favors from the OP (For example, "OP, can you send me a signed autograph").
  • Top-level comments must ask a question.
  • Comments where there would be no possibility of a real answer, especially where it is deliberately creepy or offensive.
  • "I bet OP won't answer this"-type responses, which usually come after the OP has finished responding to questions.
  • "Fluff," non-contributing responses from users, responding to all of the OP's comments for karma/attention.
  • Repeatedly asking the same question.

Please, don't attempt to bypass the rules by adding a ? to a nonquestion.

Questions must be directed toward the individual(s) doing the IAMA.

Under our policies, astroturfing is the practice of an individual or group of individuals who plant questions in an IAmA post for a particular purpose. This kind of behavior is forbidden.

UPD 1: Oh, I'm kind of tired of doing this. Please keep asking questions. Tomorrow I will answer again. Don't forget to vote for the most interesting ones. I will not have time to answer everything, I will choose something. Thanks!

UPD 2:

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Автор MikeMirzayanov, 4 года назад, По-английски

Hi.

Here is the list of top-voted blog posts in 2021. Find something interesting for yourself?

# Post Votes Author
1 The Ultimate Topic List (with Resources, Problems and Templates) 4383 YouKn0wWho
2 Codeforces Round #752 3156 YouKn0wWho
3 User activity in the profile! [new, Feb. 2021] 3055 geranazavr555
4 Codeforces Round #712 2866 Monogon
5 Codeforces Round #733 (Div. 1 + Div. 2) 2795 tourist
6 Codeforces Round #735 (Div. 2) 2167 YouKn0wWho
7 Things I don't know 1965 Um_nik
8 My opinion on how to practice competitive programming 1899 Radewoosh
9 Goodbye 2021. Hello 2022! 1849 MikeMirzayanov
10 Corruption, Cheating at ICPC Yinchuan 1685 NXIST_buster
11 Codeforces Global Round 14 1595 FieryPhoenix
12 Evidence of ACPC Corruption 1547 ACPC_Corruption
13 C++20 Is Released 1524 MikeMirzayanov
14 Codeforces Round #743 Is Unrated: Investigating the Reason 1522 MikeMirzayanov
15 I compiled a list of almost all useful blogs ever published on Codeforces [update: till 09.06.2021] 1500 parveen1981
16 New Year Gift: Codeforces Catalog — Early Access 1448 MikeMirzayanov
17 Codeforces: Results of 2020 [list some changes and improvements] 1394 MikeMirzayanov
18 Codeforces Round #715 1371 Kuroni
19 Giving negative feedback to contests in comments 1347 antontrygubO_o
20 (The Ultimate) Code Library 1334 YouKn0wWho
21 Where are my pants 1323 sus
22 Codeforces Round #736 1253 Agnimandur
23 On Problems vs. Questions in Competitive Programming: My solution 1178 Ari
24 Competitive Programming Hall of Fame — cphof.org 1176 Ra16bit
25 Codeforces Round #732 1175 AquaMoon
26 Codeforces Round #722 1145 AmShZ
27 Codeforces Global Round 13 1092 star_xingchen_c
28 Polygon Updates (June — August 2021) 1013 unreal.eugene
29 Codeforces Round #742 (Div. 2) 967 ScarletS
30 Codeforces Round #741. How contest author is entertaining. 950 Wind_Eagle
31 Codeforces Round #723 (Rated for Div 2) 923 errorgorn
32 Petition to make (onsite part of) ICPC WF 2020 1-computer 914 Um_nik
33 Cheater Report in Global Round 15 910 kostka
34 Codeforces Round #703 (Div. 2) 908 okwedook
35 Codeforces Round #743 878 Markadiusz
36 Why didn't anyone tell me that Petr was in the Vatican? 872 mcqueencin
37 [Tutorial] GCC Optimization Pragmas 854 nor
38 See your Codeforces 2021 Journey!! 830 abdude824
39 Discussion: Modern G++ Command Line 830 MikeMirzayanov
40 Codeforces Global Round 15 823 dario2994
41 China team won the IOI2021 820 Fuyuki
42 Codeforces Round #698 (Div.1, Div.2) 816 Nezzar
43 Codeforces Round #746 (Div. 2) 806 Hemose
44 Codeforces Round #754 (Div. 2) 805 JeevanJyot
45 Codeforces Round #745 Editorial 799 Phantasmagorias
46 VK Cup 2021 — Final (Engine) and Codeforces Round #740 798 tourist
47 Codeforces Round #738 (Div. 2) 796 Bazoka13
48 Codeforces Round #708 781 shishyando
49 April Fools Day Contest 2021 781 Nickolas
50 Codeforces Round #761 (Div. 2) 773 snowysecret

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Автор MikeMirzayanov, 4 года назад, По-английски

Hey!

Are you celebrating the New Year already? I wish you a Happy New Year. I wish you progress, joy and health.

We decided to show the current progress in the catalog of significant Codeforces posts.

So far, quite a bit has been implemented, but somehow you can already use it! Would you like to see it? Follow the link:



As planned, the catalog will collect and classify interesting and useful posts from Codeforces. Indeed, many useful articles have been written in Codeforces over 12 years (God, already 12 years!).

The catalog will be a kind of Codeforces golden fund in the future.

The catalog is a tree of topics to which posts can be added. We will still work on its functionality, for now there are only basic features. Don't be discouraged if something is not supported, which is very necessary — just let me know!

Any red user can enable directory editing. Remember that it is extremely important to make all changes thoughtfully and carefully. The tree should not become infinite in size. You need to have a sense of proportion when detailing topics. Please add only good, useful articles to the directory. If there is a disagreement on the contents of the catalog, the administration will make the final decision.

Hope this will be helpful. And together we can put together a catalog and keep the catalog up to date.

P.S. Many thanks to KAN who helped a lot with suggestions and catalog initial content.

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Автор MikeMirzayanov, 4 года назад, По-английски

Hello.

Here's a small improvement for posts and comments. Likes can now be specified in their markup. Maybe this will be useful for organizing some kind of polls or collecting feedback.

Here are some examples:

Markup
Use square brackets instead of round
Result
Simple likes widget
(likes:1)
Same keys means same likes widgets
(likes:2)
(likes:2)

Same keys and different groups can be used for exclusive choices
(likes:3,option1)
(likes:3,option2)

Yes, I know that this feature can be improved. I would prefer that we try to use it a little and understand what exactly is missing the most. Maybe we need to implement the fully functional polls.

Let's do a small survey using the new feature.

  1. What is your age range?

    • under 16:
    • 16-20:
    • 21-25:
    • 26-35:
    • 36+:
  2. Tabs or spaces?

    • tabs:
    • spaces:
  3. Have you had covid??

    • yes:
    • no:
    • I don't know:
  4. Lately, there have been a lot of meaningless blogs on Codeforces. Is it worth strengthening measures to fight against them?

    • yes definitely:
    • rather yes, but not necessarily:
    • rather no, I read some of them:
    • no definitely:

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Автор MikeMirzayanov, 4 года назад, По-английски

Hello Codeforces!

Oh yes, 2021 ends! I recently realized that 2022 is pronounced like "2020 too". Not that. I want a completely different year!

Anyway, we did a nice job this year. I hope we have pleased you with interesting problems. Thanks to the round coordinators and writers! You make our community richer. Please make us happy in 2022!

I wish you all interesting tasks and brilliant solutions! I wish you error-free code and wish us only rated rounds :-)

Hello, 2022!

And we have traditional gifts!

Change Handle Feature

Hurry! Only until the 10th of January, you can change your handle (but only once)! Note that it will be possible to roll back the changes or change the handle again only after a year. Be careful what you wish for.

You can change your handle to the new one which wasn't used before by anybody or which was used by you before. The links to a profile page with an old handle would automatically redirect to the actual profile.

Again, this year if you took part in at least 10 rounds you can request a handle of an inactive participant. It means that the participant should have a period of activity on Codeforces of at most 180 days, this period should be in 2019 or earlier. The inactive participant can't have posted comments, messages, and so on. It can't take part in more than 2 contests. It will be automatically renamed and informed by email. A user has the opportunity to request back his/her handle: in this case, we will roll back the change and return your previous handle to you. If you can't change your handle to another, it means that some requirements don't meet. Please do not ask me to do something with it. Especially, I do not like requests like "this is my second account, I took an interesting handle myself". I'm not Santa Claus.

Talking about handles I always
reminisce the following story. Once a user wrote me the message: "Please change my handle from I_love_Valya to I_love_Sveta, as I no longer love Valya ..."

New Year's Masquerade of Colors and Ranks

The traditional magical tab has appeared in the profile setting. Happy New Year!

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Автор MikeMirzayanov, 4 года назад, По-английски

In 2021 (as in 2019 and 2020), with the support of XTX Markets, 6 rounds of the new Codeforces Global Rounds are held: common rounds for both divisions of 7–9 problems each. The duration of the rounds is 2-3 hours, depending on the number and complexity of the problems. All such rounds are rated for all participants. At each such round, 50 brand T-shirts are handed out, and we are happy to give T-shirts to all problem authors.

The prizes for the 6-round series in 2021:

  • In each round top-100 participants get points according to the table.
  • The final result for each participant is equal to the sum of points he gets in the five rounds he placed the highest.
  • The best 20 participants over all series get sweatshirts and place certificates.

Current standings after five rounds (sorted by total points in four best placed rounds):

Place Contestant = GR 13 GR 14 GR 15 GR 16 GR 17
1 Radewoosh 3291 291 1000 1000 1000
2 tourist 2815 135 403 1000 706 706
3 ksun48 2201 135 706 706 443 346
4 maroonrk 1717 1000 226 142 226 265
5 Petr 1647 575 497 575
6 jiangly 1501 497 346 63 497 161
7 Benq 1418 497 575 346
8 Um_nik 1199 176 575 346 102 34
9 duality 1045 277 371 186 211
10 DmitryGrigorev 1006 706 176 70 54
11 Golovanov399 994 254 277 138 325
12 aid 868 226 145 218 198 226
13 tatyam 806 291 161 325 29
14 lumibons 766 325 265 176
15 sunset 742 371 371
16 dlalswp25 707 204 161 131 211
17 Subconscious 699 171 125 403
18 gisp_zjz 688 153 198 60 277
19 hitonanode 657 181 62 307 107
20 never_giveup 626 218 192 74 142
21 244mhq 625 218 291 116
22 LayCurse 622 149 265 192 16
23 Ormlis 603 171 48 235 149
24 QAQAutoMaton 575 575
25 natsugiri 574 166 110 80 218
26 hos.lyric 563 128 254 181
27 mango_lassi 555 119 135 97 204 11
28 kotatsugame 531 149 105 277
29 LJC00118 523 198 325
29 dreamoon_love_AA 523 52 307 72 92
31 Maksim1744 517 54 244 66 153
32 VivaciousAubergine 515 72 443
33 yhx-12243 511 443 68
34 He_Ren 502 371 131
35 he_____hezhou 497 497
36 SpyCheese 489 46 443
36 snuke 489 27 218 244
38 AndreySergunin 444 244 78 122
39 RALZH 443 443
40 nuip 427 166 90 171
41 Toxel 420 90 76 254
42 NotaMotuaQAQ 417 110 307
43 TadijaSebez 408 5 403
44 Alice_foo_foo 403 403
44 qazswedx2 403 403
46 Farhod 397 153 102 142
47 Endagorion 395 211 1 17 166
48 ecnerwala 391 346 45
49 hanbyeol_ 390 291 99
50 blackbori 377 83 50 244
51 SSRS_ 375 68 90 31 186
52 huyinghao0706 371 371
53 sansen 370 116 254
54 Sugar_fan 351 235 116
55 tmwilliamlin168 348 41 307
56 turmax 339 142 119 78
57 ko_osaga 325 325
58 p_b_p_b 307 307
58 353cerega 307 52 153 102
60 Marcin_smu 301 265 36
61 receed 300 102 198
62 hank55663 298 63 235
63 Froggygua 291 291
64 fanache99 288 131 105 52
65 Isonan 281 107 157 17
66 dario2994 280 94 128 58
67 KostasKostil 277 277
68 jiangly_fan 273 157 116
69 Rafbill 272 80 87 105
70 ugly2333 266 138 54 74
71 fivedemands 265 265
72 Temotoloraia 257 226 10 21
73 Elegia 254 254
74 heno239 246 176 70
75 Egor 244 244
75 AliShahali1382 244 85 24 135
77 l1ll5 238 34 204
78 kotamanegi 235 235
78 _h_ 235 235
80 dorijanlendvaj 228 10 52 166
81 noimi 225 94 34 97
82 TLEwpdus 213 2 211
83 ehnryx 211 211
84 nocriz 204 204
84 renascencepjw0510 204 204
86 fastmath 202 92 110
86 amethyst0 202 181 21
88 inaFSTream 198 198
89 atomicenergy 197 46 16 135
90 uwi 192 192
90 Worteltje 192 192
90 heuristica 192 192
93 Geothermal 188 157 31
94 Argentina 186 186
94 nantf 186 186
94 YeongTree 186 186
97 voidmax 181 181
97 scott_wu 181 181
99 Torta 177 80 97
100 nick452 176 176
101 dyrbulshchyl 174 39 63 72
102 cnoi 171 171
102 MAOooOAM 171 171
104 nutella_waxberry 166 166
105 kmjp 165 22 27 116
106 Nachia 164 138 26
107 Anadi 161 161
107 huhaoo 161 161
109 Ra16bit 158 66 92
110 dsgrekova2 157 157
110 peti1234 157 125 32
110 zh0ukangyang 157 157
113 tute7627 155 27 58 70
114 AutumnKite 153 153
115 kiyotaka 152 8 16 128
116 isaf27 150 63 87
117 Swistakk 149 149
117 TLE 149 149
119 Amoo_Safar 145 145
119 ShuijunDainifei 145 145
119 mnaeraxr 145 145
119 137_345_2814 145 145
123 bruhh 144 125 19
124 ppavic 142 142
125 m_99 141 22 119
126 Xellos 140 92 48
127 mtsd 138 138
127 why_no_girlfriend 138 138
129 crackersamdjam 135 135
129 conqueror_of_tourist 135 50 37 48
131 flashmt 131 94 37
131 shb123 131 131
133 qwerty787788 128 128
133 Zhtluo 128 128
135 Noam13 126 2 2 122
136 Melania 125 125
136 abc864197532 125 125
138 AlesyaIvanova 124 74 50
139 Arayi 122 122
139 Hazyknight 122 122
139 OddImage 122 122
142 errorgorn 121 43 78
143 krijgertje 119 119
143 ainta 119 119
145 potato167 117 37 22 58
146 eatmore 116 116
146 Merkurev 116 116
148 simonlindholm 113 113
148 Alan233 113 113
148 Yongaron 113 113
148 chenyanbo 113 113
152 Karry5307_AK_NOI2026 110 110
153 Pyqe 108 45 63
154 Itst_boyfriend 107 107
154 Tiramister 107 107
154 rin204 107 107
157 Wu_Ren 105 105
157 ix35 105 105
159 Alex_2oo8 102 102
160 antontrygubO_o 99 99
160 krismaz 99 99
160 tabr 99 99
160 Comet_Honeymoon 99 99
164 oleh1421 98 4 94
165 donentseto 97 97
165 Suika_predator 97 97
167 BurnedChicken 96 60 29 7
168 dengyaotriangle 94 94
169 Kodaman 92 92
170 LiciaDu 90 90
170 ljcleo 90 90
170 TeaPot 90 76 14
173 Aishiteru. 87 87
173 Enchom 87 87
173 antekb 87 87
176 God_Of_Blunder 85 85
176 voover 85 85
176 sumitacchan 85 85
176 AKEE_Fan 85 85
180 szhlg 83 83
180 skywalkert 83 83
180 Crysfly 83 83
180 ezLadder 83 83
184 djq_fpc 80 80
184 Roundgod 80 80
186 SirShokoladina 78 78
186 poorzero 78 78
188 C.S.T.T 76 76
188 AoLiGei 76 76
188 zhoukangyang 76 76
188 dXqwq 76 76
192 prick 74 74
192 Little_Bunny 74 17 56 1
194 szb 72 72
194 KevinWan 72 72
196 zscoder 71 37 34
197 hamlet 70 70
197 timmyfeng 70 70
199 happyguy656 68 68
199 veckoper 68 68
199 Izumi_Chiaki 68 68
202 AlenAbeshov 66 66
202 awoo 66 66
202 K_T_O 66 66
205 Rubikun 63 39 24
205 Kalptaru 63 63
207 jonathanirvings 62 62
207 jcvb 62 62
207 IZONE 62 62
210 20I6wudi 60 60
210 AlexLuchianov 60 60
210 saketh 60 60
213 risujiroh 58 58
213 Monogon 58 58
213 peltorator 58 58
216 PolarFlea 56 56
216 tfg 56 56
216 Quirrel 56 56
219 Pa.Nic 54 54
219 NeoOrgano 54 54
221 alireza_kaviani 52 52
222 s_r_f 50 50
222 icypiggy 50 50
224 _Ash__ 48 48
224 Shibuyap 48 48
226 mshcherba 46 46
226 Barichek 46 46
226 yspm 46 46
226 PuRpLe_FoReVeR 46 46
230 wifiiii 45 45
230 GaryZOOD 45 45
230 LMOliver 45 45
233 zhangzy 43 43
233 xuanyi 43 43
233 arvindf232 43 43
236 lucaperju 41 41
236 jiangIy 41 41
236 Vercingetorix 41 41
236 doped.silicon 41 41
236 shennong 41 41
241 shb 39 39
241 ruanxiaoyu 39 39
243 cheissmart 37 37
243 stevenkplus 37 37
245 leaf1415 36 36
245 AnandOza 36 36
245 klimoza 36 36
248 Iscream2001 34 34
249 Bellalabella 32 32
249 olmrgcsi 32 32
249 soltanmv 32 32
249 Sung.An 32 32
253 Mandy-Sa 31 31
253 SamBankman-Fried 31 31
253 FluffyT 31 31
256 Nyaan 29 29
256 amnesiac_dusk 29 29
256 Marckess 29 29
259 dragonslayerintraining 27 27
259 budalnik 27 27
261 wasa855 26 26
261 catupper 26 26
261 Tlatoani 26 26
261 MofK 26 26
265 KeNaj712 24 24
265 sstrong 24 24
265 Zayin 24 24
268 Konijntje 22 22
268 16silver 22 22
270 sava-cska 21 21
270 sd0061 21 21
270 yuto1115 21 21
273 w0nsh 19 19
273 rniya 19 19
273 S2speed 19 19
273 almogwald 19 19
277 yosupo 18 4 14
278 HoshimiOWO 17 17
278 xay5421 17 17
280 C137 16 16
280 VladProg 16 16
282 Nero 14 14
282 sugarrr 14 14
282 dendi239 14 14
282 cuom1999 14 14
286 olphe 13 13
286 SW2000 13 13
286 PaiGuGou 13 13
286 destination 13 13
290 Akulyat 12 7 5
291 Yukikaze_ 11 11
291 wiwitrifai 11 11
291 JeanBombeur 11 11
291 Atreus 11 11
295 Obsidian 10 10
295 Laurie 10 10
295 al3xstr33t 10 10
298 Ali.Kh 8 8
298 nweeks 8 8
298 Kostroma 8 8
298 magga 8 8
302 Nots0fast 7 7
302 zyb 7 7
302 Andycipation 7 7
305 NoLongerRed 5 5
305 kamer 5 5
305 craborac 5 5
308 TheScrasse 4 4
308 tin-jyu 4 4
308 strongerthanspeed 4 4
311 iaNTU 3 1 2
312 dfcmd 2 2
313 Jlytxdy 1 1
313 GRT_2018 1 1

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Автор MikeMirzayanov, 5 лет назад, По-английски

Hello, Codeforces.

Please, welcome c++20 support on Codeforces. Yes, it is 64-bit. Thanks to Brecht Sanders: I used his distribution GCC-11.2.0-64 from https://winlibs.com/.

If you have installed PBOX, you can add this compiler with the line pbox install gcc11-64-winlibs. Probably, a good idea is to add C:\Programs\gcc11-64-winlibs\bin into the PATH. More about PBOX you can read here.

I use the compilation command line similar to other GCC installations: g++ -Wall -Wextra -Wconversion -static -DONLINE_JUDGE -Wl,--stack=268435456 -O2 -std=c++20 <source>. The only differences are -std=c++20 and -Wall -Wextra -Wconversion (I plan to use somehow such warnings in Polygon to suggest fixes in uploaded files).

Now you can use c++20 in your solutions. I'm not sure there are many features useful in competitive programming. Probably, I'm wrong. For example, now you can write vector v{vector{1, 2}}; instead of vector<vector<int>> v{vector<int>{1, 2}};. What else is useful? Please, if you are good with modern C++ then write.

You might be interested in looking at such a table. Before implementation, I always test every C++ distribution for the efficiency of reading and writing large amounts of data. For example, the latest GCC compiler from MSYS2 is terribly slow in some cases. I don't want to use it here. Also, it happens that some specifiers like lld or Lf work unexpectedly. In the table by reference, the second line is the added compiler. The columns correspond to different tests. The cell contains the time of the test execution. If I have time, I will someday publish scripts for testing c++ compiler installations.

Bye for now,
— Mike

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Автор MikeMirzayanov, 5 лет назад, По-английски

Hey! I'm happy to report that Pypy3 is supported. Please test that it works as expected. Thanks!

P.S. I remember about GCC 11, it is in the progress. See you soon.

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Автор MikeMirzayanov, 5 лет назад, По-русски

Привет!

Наступил октябрь, а значит, пришло время объявить, что Mail.ru Group совместно с МФТИ, МГТУ им. Н.Э.Баумана и CodeForces запускает седьмой по счету «Технокубок» — олимпиаду за звание самого талантливого молодого программиста среди учеников 8-11 классов!

«Технокубок» входит в проект Перечня олимпиад школьников РСОШ, дающих льготы при поступлении в высшие учебные заведения РФ, как олимпиада I уровня — победители и призеры финального этапа олимпиады смогут поступить в вуз без экзаменов или получить 100 баллов за ЕГЭ по информатике. Кроме того, все победители «Технокубка» получат ценные призы, а также привилегии при поступлении на образовательные проекты Mail.ru Group.

Финал олимпиады пройдет в марте 2022 года. Формат его проведения будет известен позднее в связи с эпидемиологической обстановкой.

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Автор MikeMirzayanov, 5 лет назад, По-английски

Hello.

Sorry for it. Actually, right now I don't have any idea why testing is so slow now. Obviously, it doesn't work as expected. It is not because of problems. So please don't blame writers or coordinators. I'm investigating the reason, but don't see it now.

I myself am very upset and I apologize to the authors, coordinator, and participants. I will do my best to find the cause and fix it. Surprisingly, we haven't made any big changes to this part of the system lately. But something went wrong.

Mike.

UPD: https://mirror.codeforces.com/blog/entry/95081#comment-841873

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Автор MikeMirzayanov, 5 лет назад, По-английски

Hello Codeforces!

I am in the process of making improvements and updates to the judgment machines. I've read the post https://mirror.codeforces.com/blog/entry/94587 and I think, maybe it is a good idea to make such a compilation line -O3 -funroll-loops -march=native -mtune=native? I haven't done any research that it is definitely better than -O2 and it is best in the general case for CP solutions. In a way, this will only strengthen the gap from Python/PyPy/Java, on the other hand: in pragmas and so you can set up everything. What do you think? What are suggestions to the command line?

P.S. You got it right. Yes, gcc11 std=c++20, pypy3 64-bit and more are coming.

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Автор MikeMirzayanov, 5 лет назад, По-английски

Hello, Codeforces.

We want to run a series of load testing in the production environment for running contests. For this reason, Codeforces Round 739 will be temporarily extended (in order to test it at the current round). We will temporarily disable the ability to send solutions to it so that its extended duration will not affect the results. After the completion of the work, the duration of the round will be returned.

Our current plan is to finish today.

Mike

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Автор MikeMirzayanov, 5 лет назад, По-английски

Hey!

As I don't see the post discussing the round, I decided to write this.

I do not participate much in contests now. But I love Code Jam. Thanks to problem writers and organizers!

It seemed to me that this round was no more difficult than the previous one. How do you like it?

I liked the problems:

  • A (tags: interactive, constructive): strange problem — the most naive approach fits into the requirements on the total cost of requests;
  • B (tags: number theory, dp): I wrote some kind of DP with memorization of $$$(a, s)$$$, where $$$a$$$ is the last element in the sequence we already placed (I build in increasing order) and $$$s$$$ is the total sum for the future elements. I don't have a proof why it works fast, probably because of the number of divisors is small.
  • C (tags: combinatorics, recurrence): the last occurrence of 1 is the position of $$$n$$$, so we can divide sequence with this position on two parts and use DP to calculate the answer (don't forget to multiply on binomial coefficient);
  • D (tags: graphs, flows, greedy): I used min-cost-flow to match Ms on the first field and the second in optimal way. I tried all possible values of flow to iterate over all possible pairs of Ms I want to match and took best cost among all choices.

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Автор MikeMirzayanov, 5 лет назад, По-русски

Всем привет!

Сегодня мы открываем еще один курс в разделе EDU. Этот курс будет создаваться силами энтузиастов из сообщества. Первое занятие в нём подготовил Егор peltorator Горбачёв, тема — "Префиксные суммы и разностные массивы". Мы уже знакомы с его замечательными учебными видеоматериалами. Спасибо за помощь, Егор!

Типичное занятие раздела EDU содержит серию шагов, состоящих из видеороликов, конспекта и набора учебных задач.

Перейти в раздел EDU →

Мы будем рады инициативе со стороны авторитетных членов сообщества по подготовке следующих занятий. Пока мы только начинаем, но надеемся на вашу помощь. Текущее требование к авторам занятий простое — красный цвет аккаунта сейчас или когда-либо в прошлом. По вопросам и предложениям надо писать Павлу pashka Маврину — координатору и завучу курса EDU от сообщества.

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Автор MikeMirzayanov, 5 лет назад, По-английски

Hi Codeforces!

Yes, I know it's already April. Time flies so fast lately! Exactly a year ago we were just learning all the "delights" of lockdown.

So let's remember this 2020! What was it like? I don't know about you, but we had a hell of a lot of work.

I will now show you some graphs and you will be very surprised. Lockdown effect? Of course, but we did our best too.

Many thanks to everyone who did not stand aside! In 2020, we celebrated our 10th anniversary and crowdfunding money helps us grow and move forward. You helped us and each other. Thank you. Thank you for your contribution!

We've been working hard all year to make this community a better place. Did it work out? It's up to you to judge. Many thanks to everyone who invested time and effort:

Time to take stock of 2020.

Partner Events

We are pleased to hold programming competitions with companies or for companies. I'm sure this is a great way to support the community of young programmers and hire talented candidates. Here is a list of our main partners this year:

  • Telegram and personally Pavel Durov is supporting Codeforces activities for many years, every regular round is held with their help, thank you!
  • ICPC — in 2020 we held several joint events (and we liked it!), I hope there will be more
  • Mail.Ru — Technocup and Russian AI Cup
  • VK, VK Cup — now a personal multi-track competition for Russian-speaking programmers
  • XTX Markets, Codeforces Global Rounds — a series of 6 rounds with a separate scoring and souvenirs for the best participants
  • Harbour.Space University — a series of educational rounds, the selection of summer school Tech Scouts
  • JetBrains, Kotlin Heroes Rounds — Kotlin programming language contests
  • Huawei — research competitions (marathons) with elements of machine learning
  • Raiffeisenbank — round for both divisions with cool prizes
  • Grakn Labs — round for both divisions with money prizes
  • Microsoft, Microsoft Q # Coding Contest — unusual quantum computing competition

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Автор MikeMirzayanov, 5 лет назад, По-английски

Hello, Codeforces!

I understand that 2021 has been going on for a long time, but here I have picked up a subset of some of the improvements that the Codeforces team made in 2020. Soon I will publish numbers (no, charts) with statistics for 2020. In the meantime, I bring to your attention a list of changes and improvements.

By the way, this is a decent list. This is about half to a quarter of all changes. It's just that other changes are more often somewhere in the internals of the system and are not visible to users. Please read this list. Each item is the effort of someone from the team. Thanks to geranazavr555, kuviman and cannor147 for their efforts. You've made our platform better! Well, by the way, I don't quit programming and many improvements were made by me.

The items on the list are written in a concise and informal form, many of the items I just copied from commit messages from git. If you want more details — ask in the comments, we will tell you! Of course, I forgot to include some improvements in the list.

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Автор MikeMirzayanov, 5 лет назад, По-английски

Hello Codeforces!

This unusual and difficult 2020 has come to an end! What will the new year be like? I wish all of us that we have the opportunity to meet in person so that the contests take place not only online. I ask you to think of something important and good. Let this wish come true!

We have had a large number of rounds this year. I hope we have pleased you with interesting problems. Thanks to the round coordinators and writers! You make our community richer. Please make us happy in 2021!

I wish the participants victories over yourself (and over problems!) and development of your skills, interest and curiosity!

Hello, 2021!

And we have traditional gifts!

Change Handle Feature

Hurry! Only until the 10th of January, you can change your handle (but only once)! Note that it will be possible to roll back the changes or change the handle again only after a year. Be careful what you wish for.

You can change your handle to the new one which wasn't used before by anybody or which was used by you before. The links to a profile page with an old handle would automatically redirect to the actual profile.

Again, this year if you took part in at least 10 rounds you can request a handle of an inactive participant. It means that the participant should have a period of activity on Codeforces of at most 180 days, this period should be in 2017 or earlier. The inactive participant can't have posted comments, messages and so on. It can't take part in more than 2 contests. It will be automatically renamed and informed by email. A user has the opportunity to request back his/her handle: in this case, we will roll back the change and return your previous handle to you. If you can't change your handle to another, it means that some requirement doesn't meet. Please do not ask me to do something with it. Especially, I do not like requests like "this is my second account, I took an interesting handle myself". I'm not Santa Claus.

Talking about handles I always
reminisce the following story. Once a user wrote me the message: "Please change my handle from I_love_Valya to I_love_Sveta, as I no longer love Valya ..."

New Year's Masquerade of Colors and Ranks

The traditional magical tab has appeared in the profile setting. Happy New Year!

MikeMirzayanov

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Автор MikeMirzayanov, 5 лет назад, По-английски

You can view PDF version of the tutorial by the link.

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Автор MikeMirzayanov, 5 лет назад, По-русски

Добрый день!

15-го ноября состоялся Четвертьфинал Южного подрегиона NEERC (Northern Eurasia) чемпионата ICPC. В этом году соревнование проходило онлайн. Соревновались 108 команд, многие из которых получили приглашение по результатам квалификационного этапа.

Совсем скоро в пятницу, 25-го декабря в 14:35 (МСК) состоится онлайн-зеркало 2020-2021 ICPC, NERC, Южный четвертьфинал (онлайн-трансляция, правила ICPC).

Надеюсь, вам понравятся задачи. Председателем жюри этого соревнования являюсь я, а над задачами работал дружный коллектив жюри экс-участников чемпионата из Саратовского ГУ и иногородние члены жюри: adedalic, ashmelev, BledDest, DmitryKlenov, DStepanenko, elena, KAN, kuviman, MikeMirzayanov, pashka, PavelKunyavskiy, Дмитрий Мещеряков, Герман Наркайтис. Спасибо!

Отдельные лучи благодарности тестерам: Merkurev, Um_nik, romanasa, josdas, budalnik, Perforator, Oleg_Smirnov, IlyaLos, Supermagzzz, Stepavly, Igor_Kudryashov, HolkinPV, Edvard, le.mur!

Приглашаю команды ICPC к участию и просто индивидуальных участников соревнований Codeforces принять участие!

Конечно, соревнование будет нерейтинговое. Участников официального соревнования я прошу воздержаться от участия в зеркале и обсуждении задач до его окончания.

Так как в этом году аудитория участников была шире (из-за онлайн-формата), то и задачи мы подобрали чуть доступнее, чем в прошлые годы. Если вы из топ-команды, которая претендует на медаль в Финале ICPC, то, возможно, веселее вам будет решать этот контест лично.

Удачи!

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Автор MikeMirzayanov, 5 лет назад, По-английски

In 2020, with the support of XTX Markets, 6 rounds of the Codeforces Global Rounds were held. Each round was common for both divisions. All such rounds were rated for all participants. At each such round, 50 brand T-shirts were handed out, and we gave T-shirts to all problem writers!

I say a big thank you to XTX Markets (and personally to Yuri Bedny and Alexander Gerko) for supporting Global Rounds. Without your help, we could not host them! I sincerely admire companies like these who come to support and develop the community that some of their employees come from. It will be great if other companies follow the example and also offer their help. We need it!

The prizes for the 6-round series in 2020:

  • In each round, top-100 participants get points according to the table.
  • The final result for each participant is equal to the sum of points he gets in the four rounds he placed the highest.
  • The best 20 participants over all series get sweatshirts and place certificates.

Final results (and congratulations!):

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Автор MikeMirzayanov, 6 лет назад, По-русски

Mail.ru Group совместно с МФТИ, МГТУ им. Н. Э. Баумана и Codeforces в шестой раз запускает «Технокубок» — олимпиаду по программированию для школьников. В этом году «Технокубок» вошел в перечень олимпиад первого уровня.

Сразиться за звание самого талантливого молодого программиста приглашаются учащиеся средних образовательных учреждений 8-11 классов.

Победители и призеры олимпиады будут определены по результатам очного этапа, который будет проведен 7 марта 2021 года на базе МФТИ, МГТУ им. Н.Э.Баумана, а также на других региональных площадках, о которых будет сообщено позднее.

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Автор MikeMirzayanov, 5 лет назад, перевод, По-русски

Привет, Codeforces!

Есть кое-что новое. Кажется, теперь переиспользовать задачи с раундов в учебных и прочих целях станет проще.

Как вы знаете, в мэшапы можно добавлять задачи с прошедших раундов Codeforces просто по их кодам вида 1234D (айдишник контеста + буква задачи). Я сам регулярно этим пользовался, когда преподавал в Саратовском университете — очень удобно было так делать тренировки: задачи ожидаемой сложности и тематики, есть русское и английское условия, можно посмотреть разбор и множество решений. Почти всюду очень сильные тесты по причине поддержки взломов и довзламывания, задачи хорошо подготовлены. Кроме того, с помощью списков пользователей можно для группы учащихся легко подобрать задачи, которые они не решали.

Но была и проблема: задачи в таких тренировках легко гуглились. И если взрослые участники в большинстве своем могли справится с искушением подсмотреть решение или тесты, то новички иногда поступали нечестно. Я получал несколько просьб придумать что-то с этим недостатком. Одна из последних таких просьб была от Daniel Darooha Sleator (https://en.wikipedia.org/wiki/Daniel_Sleator). Спасибо за идею!

Итак, кажется, работа завершена. Встречайте новую возможность на Codeforces: теперь вы можете переписать условия для задач в мэшапах, полностью заменив его на своё собственное. Подробнее о возможностях нового функционала:

  • в мэшапах для задач появляется новый ссылка-значок , перейдя по которому будет форма для создания/редактирования нового условия;
  • вы можете использовать оригинальный текст условия как шаблон при написании собственного: будьте очень аккуратны — вы должны в точности повторить все детали условия, чтобы задачи формально не различались;
  • эта форма сравнивает набор формул в оригинальном тексте и новом условии и если они различаются как множества, то будет соответствующее подробное предупреждение;
  • вы можете установить собственные тесты из условия (примеры) — здесь тоже надо быть очень внимательным, чтобы они были формально корректными;
  • если вы добавили примеры, то сначала решения будут протестированы на них, а лишь затем на официальных тестах;
  • вы можете загрузить собственные файлы с изображениями и использовать их в условиях;
  • есть настройка, чтобы временно выключать использование нового условия (например, если оно еще в разработке).

Учитывая, что в архиве сейчас уже более 6500 задач, открывается отличная перспектива для организации тренировок и учебных занятий.

Надеюсь, что нововведение будет полезно. Пишите в комментариях, что можно улучшить и/или исправить.

М.

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Автор MikeMirzayanov, 6 лет назад, По-английски

During the round Grakn Forces 2020 many of you can notice that now we highlight diff in statements if they changed. Do you like this new feature?

Also, I'm thinking on the way to automatically notify participants if statements changed. I still do not fully understand how this should ideally be implemented. Sometimes it is true that just a forgotten comma was added. On the other hand, it is almost always better to notify of changes. What do you think?

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Автор MikeMirzayanov, история, 6 лет назад, По-английски

In 2020 (as in 2019), with the support of XTX Markets, 6 rounds of the new Codeforces Global Rounds will be held. These will be common rounds for both divisions of 7–9 problems each. The duration of the rounds will be 2-3 hours, depending on the number and complexity of the problems. All such rounds will be rated for all participants. At each such round, 50 brand T-shirts will be handed out, and we will be happy to give T-shirts to all problem authors and problem testers.

The prizes for the 6-round series in 2020:

  • In each round top-100 participants get points according to the table.
  • The final result for each participant is equal to the sum of points he gets in the four rounds he placed the highest.
  • The best 20 participants over all series get sweatshirts and place certificates.

Current standings after four rounds (sorted by total points in four rounds):

Place Contestant = GR 7 GR 8 GR 9 GR 10
1 tourist 3203 1000 706 1000 497
2 ecnerwala 1841 235 1000 31 575
3 Um_nik 1606 706 403 497
4 boboniu 1575 575 1000
5 maroonrk 1278 149 371 52 706
6 Petr 990 497 50 443
7 yosupo 978 211 575 192
8 sunset 803 291 166 346
9 Benq 769 307 176 21 265
10 ksun48 736 122 211 403
11 LayCurse 716 171 291 254
12 scott_wu 706 706
13 Radewoosh 703 244 443 16
14 Egor 690 107 265 74 244
15 hos.lyric 661 128 226 307
16 TLEwpdus 651 235 198 218
17 jiangly 646 497 149
18 Swistakk 602 277 90 235
19 hank55663 588 74 291 78 145
20 neal 584 131 277 176
21 Marcin_smu 575 575
22 zeronumber 564 68 325 171
23 244mhq 523 325 198
24 KAN 511 307 204
25 Itst_boyfriend 493 94 92 307
26 conqueror_of_tourist 470 244 226
27 cuizhuyefei 443 443
27 heuristica 443 443
29 tmwilliamlin168 441 70 371
30 Golovanov399 438 161 277
31 lqs2015 424 21 403
32 snuke 420 32 325 63
33 whzzt 417 92 325
34 Motarack 404 58 346
35 TLE 403 403
36 heno239 400 29 371
37 mango_lassi 393 138 153 102
38 eatmore 375 346 29
39 WZYYN 371 371
40 Errichto 367 186 181
41 dreamoon_love_AA 354 119 235
41 PavelKunyavskiy 354 346 8
43 ko_osaga 348 226 122
44 Noam527 346 142 204
45 uwi 342 211 131
46 natsugiri 341 192 149
47 aid 339 254 85
47 duality 339 153 186
49 qwerty787788 330 39 291
49 Maksim1744 330 181 149
51 kort0n 304 34 157 113
52 Yongaron 292 161 131
53 molamola. 277 277
54 frodakcin 276 254 22
55 SirShokoladina 266 105 161
56 RomaWhite 265 265
56 mrscherry 265 265
58 Merkurev 261 142 119
58 ainta 261 63 198
60 mtsd 258 145 113
61 EnEm 254 254
62 xiaowuc1 244 244
63 nonamefour0210 243 32 211
64 orz 226 226
65 DmitryGrigorev 220 16 204
65 nuip 220 128 92
67 ohweonfire 218 218
67 DCXDCX 218 218
67 79brue 218 218
70 tatyam 214 138 76
71 Ilya_MSU 209 74 125 10
72 amnesiac_dusk 204 204
73 stevenkplus 202 21 181
74 djq_fpc 198 198
75 zeliboba 193 27 166
76 HashimotoNanami 192 192
76 _h_ 192 161 31
76 .I. 192 192
79 kiyotaka 186 186
79 Sulfox 186 186
81 dario2994 181 135 46
81 jhnan917 181 181
83 kmjp 177 105 72
84 FizzyDavid 176 176
84 atomicenergy 176 176
86 Amoo_Safar 175 4 171
87 receed 174 13 161
88 nick452 171 43 128
88 tribute_to_Ukraine_2022 171 171
90 okikust 166 166
90 craborac 166 166
92 imeimi 157 157
92 cookiedoth 157 157
94 risujiroh 153 153
94 chokudai 153 153
94 zylber 153 153
97 never_giveup 145 145
98 Muffinhead 142 142
98 GreymaneSilverfang 142 142
98 YeongTree 142 80 62
101 Toxel 138 138
101 Shayan 138 138
103 RNS_CUS 135 135
103 hepth 135 135
103 budalnik 135 135
106 dyxg 131 131
106 ATS 131 131
108 ruanxiaoyu 129 39 90
109 LHiC 128 92 36
110 lzr_010506 125 99 26
110 primenumber 125 125
110 Martin53 125 125
110 sigma425 125 125
114 Chelly 124 56 68
115 littlelittlehorse 122 122
115 dlalswp25 122 122
115 Potassium 122 122
118 Tima 119 119
119 yhx-12243 117 72 45
120 blackbori 116 116
120 yokozuna57 116 116
120 PinkieRabbit 116 116
120 betrue12 116 116
120 SSRS_ 116 50 66
125 MofK 115 102 13
126 Pigbrain 113 113
126 zhangguangxuan99 113 113
128 oopsimbad 110 110
128 Jacob 110 110
128 tempura0224 110 110
128 Eliden 110 110
132 yashChandnani 107 107
132 LynCean 107 107
132 Temotoloraia 107 107
135 Reyna 106 72 34
136 kriii 105 105
136 pashka 105 105
138 BlackPuppy 102 102
138 Thienu 102 102
140 Roundgod 101 41 60
141 antontrygubO_o 100 1 99
142 Sugar_fan 99 99
142 mayaohua 99 99
144 skylinebaby 97 97
144 neko_nyaaaaaaaaaaaaaaaaa 97 97
144 shino16 97 97
144 zscoder 97 97
148 Eternal_Dream 94 94
148 ollpu 94 94
148 riadwaw 94 94
151 jdurie 93 37 56
152 penguin1017 92 14 78
153 weishenme 90 90
153 est_stella 90 90
155 yuma_ 87 87
155 Konijntje 87 87
155 mnbvmar 87 87
155 icecuber 87 87
159 KayacanV 85 85
159 Rubikun 85 85
159 kobae964 85 85
162 stupid_american 83 83
162 Farhod 83 83
162 BigBag 83 83
162 shenxy13 83 83
166 turmax 80 80
166 sevlll777 80 80
166 GaloisTears 80 80
169 Gassa 78 78
169 crazyilian 78 78
169 znirzej 78 78
172 little_misfortune 76 76
172 Antoine 76 76
174 Alex_2oo8 74 74
175 disangan233 72 72
175 falanga 72 72
177 hugopm 70 70
177 MicGor 70 70
179 Egg_Tart_Forest 68 68
179 bruhh 68 10 58
179 upobir 68 68
182 xuanyi 66 66
182 paula 66 66
182 Shef 66 66
185 JiriKalvoda 63 63
185 gazelle 63 63
185 TadijaSebez 63 63
185 nocriz 63 63
189 nhho 62 62
189 Isonan 62 62
191 JeffreyLC 61 45 16
192 Geothermal 60 60
192 Little_Bunny 60 60
194 noimi 58 58
194 wucstdio 58 48 10
194 Kostroma 58 58
197 CKP_ 56 56
197 hitonanode 56 56
199 chenjb 55 36 19
200 errorgorn 54 54
200 Fuyuki 54 54
200 Kiri8128 54 54
200 cescmentation_folch 54 54
204 Retro3014 52 52
204 Ali.Kh 52 52
204 QwertyPi 52 52
207 aaaaajack 50 50
207 ttttan 50 50
209 RNS_MHB 48 48
209 misty1999 48 48
209 awoo 48 48
212 NotaMotuaQAQ 46 46
212 majk 46 46
212 tonyjjw 46 46
215 MAOoo_Love_Molly 45 45
215 vepifanov 45 45
217 jklepec 43 43
217 Morokei 43 43
217 Rewritetxdy 43 43
220 skip2004 41 41
220 Volkov_Ivan 41 41
220 Zayin 41 41
223 celesta 39 8 31
223 balbit 39 39
223 pwypeanut 39 39
223 wangziji 39 39
227 Nachia 38 22 16
228 VladaMG98 37 37
228 pupiI 37 37
230 Kalptaru 36 36
230 loup 36 36
232 oscar114514 34 34
232 EricHuang2003 34 34
234 jtnydv25 32 32
234 rstoick 32 32
236 cdkrot 31 31
237 J_J_ 29 29
237 nigus 29 29
237 lxr_love_yxh 29 29
240 Will_Dearborn 27 27
240 AndreySergunin 27 27
242 Tweetuzki 26 26
242 AlesyaIvanova 26 26
242 nagpaljatin1411 26 26
242 darnley 26 26
246 Aeon 24 24
246 gepardo 24 24
246 oversolver 24 24
249 xtqqwq 22 22
249 KAP 22 22
251 yao11617 21 21
251 Pa.Nic 21 21
253 Apsara 19 19
253 kotatsugame 19 19
253 kotamanegi 19 19
256 Ari 17 17
256 dorijanlendvaj 17 17
256 low_ 17 17
259 nikolapesic2802 16 16
259 Akulyat 16 11 5
261 KrK 14 14
261 jiangly_fan 14 14
263 summitwei 13 13
263 AutumnKite 13 13
263 AliShahali1382 13 13
266 Wild_Hamster 11 11
266 qhqh 11 11
268 boook 10 10
268 tnowak 10 10
270 ehnryx 8 8
271 m_99 7 7
271 krijgertje 7 7
271 Tlatoani 7 7
271 Cyprien 7 7
275 vasilescu_mihai 5 5
275 osmanorhan 5 5
275 primaryStu 5 5
275 kpw29 5 5
275 baqargam 5 5
280 amethyst0 4 4
281 user202729 2 2
281 daifucong 2 2
281 -eidolon- 2 2
281 ekaerovets 2 2
285 mphillotry 1 1
285 SPatrik 1 1
285 Mojumbo 1 1

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