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arsijo's blog

UOI 2024 — Call for tasks
By arsijo, history, 10 months ago, In English

Hi everyone,

We are starting the call for tasks to the Ukrainian Olympiad in Informatics 2024. We need tasks of various difficulties. We do pay for the tasks.

The tasks from the previous year can be found here (day1, day2).

Please submit the problems to Barichek via Codeforces or to his telegram. The deadline is the 29-th of February.

Regards,

Leader of Ukraine at IOI

Anton Tsypko

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Ukrainian Olympiad in Informatics 2023 — Mirror
By arsijo, 19 months ago, In English

On April 11 and 12 the Ukrainian Olympiad in Informatics 2023 took place. Because of the war, the Olympiad took place in the regional centers of Ukraine and in Warsaw.

The problems were created by RomaWhite, BigBag, Barichek, antontrygubO_o, I_LOVE_ANTON_DONBASS, Denisov, VladProg, Grogu, TheScrasse, bortoz, Kaey, andr1y

The mirror will take place on April 15 and 16. It will start at 11 AM Kyiv time. You can choose any 5-hour window to participate. The problems will be available in Ukrainian and English. Everyone is welcome to participate (except for the participants from the terrorist state).

The link to the first round: uoi2023-1.eolymp.io

The link to the second round: uoi2023-2.eolymp.io

The results of the mirror contest are available here. The original results are available here.

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EJOI 2022 — Practice Round
By arsijo, 2 years ago, In English

The EJOI 2022 Practice Round is now available with free registration on Eolymp.

In order to introduce the system to the EJOI participants, we have uploaded previous EJOI problems to our system. All the links are available below.

For 2017, 2020, and 2021, the participants can read the problems in their native language (if the problems were translated to that language that year).

According to the EJOI rules, only C++ is supported.

The first two links are for the virtual contests. Participants can start the contest, and the timer for 4 hours will start. They will be able to submit their solutions only during that time. This is something similar to USACO style. In the third contest, you can upsolve problems as long as you want.

Year Day 1 Day 2 Upsolve Results
2017 Link Link Link Link
2018 Link Link Link Link
2019 Link Link Link Link
2020 Link Link Link Link
2021 Link Link Link Link

The results of all contests is available here, and the results of upsolving here.

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Codeforces Global Rounds 2019: Final Results
By arsijo, 5 years ago, In English

In 2019, with the support of XTX Markets, 6 rounds of the new Codeforces Global Rounds were held. Each round was common for both divisions and had 7–9 problems. The duration of the rounds was 2-3 hours, depending on the number and complexity of the problems. 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 authors and problem testers as well.

The prizes for the 6-round series in 2019:

  • 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:

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SEERC 2019 and Grand Prix of Southeastern Europe
By arsijo, 5 years ago, In English

Hi everyone,

I am happy to announce that the 2019 Southeastern Europe Regional Contest will take place on October 19 in Bucharest and Vinnytsia at 10 am UTC+3. The link to the live results will be published here after the start of the competition.

Moreover, in the following day, there will be the Grand Prix of Southeastern Europe based on these problems at 8 am UTC. If you do not participate in it, you will be able to take part in online mirror, which will be available at the same time.

Because of the Grand Prix, we are asking the official contestants not to discuss the problems in public.

After it, we will upload the contest to the gym and publish the editorial.

Good luck!

UPD. SEERC standings.

UPD2. Congratulations to the winners!

Place Team Name Contestant 1 Contestant 2 Contestant 3 Problems Penalty
1 [UNIBUC] ScrambledEggs bicsi theodor.moroianu livlivi 8 1001
2 KhNURE_NRG BigBag Mustang98 shanin 8 1077
3 RAF Penguins Pajaraja milisav allllekssssa 8 1401
4 KhNU_DOROGA* Stroustrup kilt_01 13022001 7 976
5 KNU_MaxFun Adalbert Barichek Markellonchik 7 1027
6 UNAGI osmanorhan ikbal ozcelik 7 1498
7 LNU Jackals Danylo99 mshcherba BohdanPastuschak 6 508
8 UBB_HakunaMatata Bodo sebinechita Cozma_Tudor 6 719
9 KNU_Kektus* danya.smelskiy iSlava PashaChemerys 6 777
10 [UAIC] VYE Juve45 cristian1997 denis2111 6 824

UPD3. Online mirror will be available here. PS. You should join the group first. The mirror will start after the Open Cup.

UPD4. Editorial is here.

UPD5. The contest is available in the gym.

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Codeforces Global Rounds 2019: Current Results After Five Rounds
By arsijo, 5 years ago, In English

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 authors and problem testers.

The prizes for the 6-round series in 2019:

  • 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 five rounds:

Place Contestant = Round 1 Round 2 Round 3 Round 4 Round 5
1 tourist 2412 1000 706 706 0 0
2 mnbvmar 2246 497 403 1000 325 346
3 Radewoosh 1819 74 0 39 706 1000
4 Petr 1724 0 443 575 0 706
5 ecnerwala 1635 0 1000 138 0 497
6 Um_nik 1588 706 575 0 0 307
7 LHiC 1494 277 0 443 497 277
8 ainta 1374 135 0 218 1000 21
9 sunset 1305 443 371 346 0 145
10 ksun48 1194 371 198 371 0 254
11 krijgertje 1052 0 291 325 192 244
12 maroonrk 930 149 0 119 371 291
13 Egor 876 0 116 403 186 171
14 izban 734 128 0 113 122 371
15 zemen 710 204 41 62 0 403
16 Reyna 703 5 41 254 403 2
17 webmaster 698 60 186 226 226 0
18 yutaka1999 683 186 0 497 0 0
19 jqdai0815 668 403 0 0 0 265
20 tzuyu_chou 662 0 0 87 575 0
21 TLE 638 575 24 39 0 0
21 Endagorion 638 13 497 128 0 0
23 300iq 575 0 0 0 0 575
24 yokozuna57 548 74 325 149 0 0
25 kmjp 545 226 46 0 171 102
26 fateice 518 307 211 0 0 0
27 whzzt 517 171 70 171 105 0
27 gop2024 517 0 0 125 235 157
29 aid 503 107 11 116 161 119
30 neal 463 211 171 0 7 74
31 dreamoon_love_AA 447 0 90 0 204 153
32 Benq 443 0 0 0 443 0
32 RomaWhite 443 0 0 0 0 443
34 lych_cys 436 218 218 0 0 0
35 lumibons 431 0 265 166 0 0
36 snuke 410 325 0 0 0 85
37 riadwaw 409 192 0 110 107 0
38 kczno1 390 83 0 307 0 0
39 Subconscious 383 0 149 92 0 142
40 E869120 380 0 153 16 211 0
41 isaf27 379 56 0 32 291 0
42 yosupo 370 166 0 0 0 204
43 ania 369 198 74 0 97 0
44 Elegia 363 85 0 97 181 0
45 nhho 346 0 0 0 346 0
45 Rewinding 346 0 346 0 0 0
45 molamola. 346 346 0 0 0 0
48 yfzcsc 344 37 0 0 307 0
49 Alex_2oo8 342 0 166 176 0 0
50 Golovanov399 339 7 0 78 19 235
51 Kostroma 334 4 181 0 149 0
52 rng_58 325 0 0 0 0 325
53 jonathanirvings 323 97 226 0 0 0
54 Swistakk 316 0 0 0 244 72
55 MofK 309 8 198 0 92 11
56 realDonaldTrunp 307 0 307 0 0 0
57 Sugar_fan 304 0 83 83 0 138
58 Egor.Lifar 298 0 145 0 46 107
59 ATS 297 0 0 265 32 0
60 fedoseev.timofey 292 0 32 135 0 125
61 RNS_CUS 291 0 0 291 0 0
61 V--o_o--V 291 291 0 0 0 0
63 zeliboba 289 0 45 244 0 0
64 G.Z.V.O.D.E.N 284 113 0 0 171 0
65 Hazyknight 282 0 78 204 0 0
66 yhx-12243 277 0 277 0 0 0
66 MrDindows 277 0 0 0 277 0
66 betaveros 277 0 0 277 0 0
69 eatmore 269 138 0 131 0 0
70 bicsi 268 0 0 192 0 76
71 visitWorld 265 265 0 0 0 0
71 scott_wu 265 0 0 0 265 0
73 betrue12 261 0 0 0 80 181
74 DearMargaret 254 0 0 0 254 0
74 sigma425 254 254 0 0 0 0
74 leaf1415 254 0 254 0 0 0
77 beginend 252 0 0 0 60 192
78 scanhex 249 0 92 157 0 0
79 gisp_zjz 248 0 0 186 0 62
80 ilyakor 246 0 60 0 116 70
81 uwi 244 244 0 0 0 0
81 Arterm 244 0 244 0 0 0
83 peltorator 235 0 235 0 0 0
83 dotorya 235 235 0 0 0 0
83 khsoo01 235 0 0 235 0 0
86 fivedemands 226 0 0 0 0 226
87 komendart 224 0 0 161 63 0
88 Coder 222 0 0 142 0 80
89 mango_lassi 218 0 0 48 138 32
89 gepardo 218 0 0 0 218 0
89 hbi1998 218 0 0 0 0 218
92 Shanru 211 0 0 211 0 0
92 ppc_qjd 211 0 0 0 0 211
94 Marcin_smu 208 0 0 0 198 10
95 vammadur 204 0 204 0 0 0
96 dlalswp25 203 0 0 46 157 0
97 mareksom 201 99 102 0 0 0
98 hos.lyric 200 0 176 0 0 24
99 Biden 198 0 0 198 0 0
99 zdolna_kaczka 198 0 0 0 0 198
101 TLEwpdus 197 0 161 0 36 0
101 Maksim1744 197 0 107 0 90 0
103 kdh9949 196 157 0 39 0 0
104 AFO_OFA 194 78 116 0 0 0
105 pashka 188 0 0 2 0 186
105 Xellos 188 0 72 0 0 116
105 Merkurev 188 94 0 0 94 0
108 calabash_grandfather 181 181 0 0 0 0
108 Torta 181 0 0 0 43 138
108 renjingyi 181 0 0 181 0 0
111 VArtem 180 0 135 0 0 45
112 voover 176 176 0 0 0 0
112 amethyst0 176 0 0 0 176 0
112 Cirno_9baka 176 0 0 0 0 176
115 zscoder 166 0 0 0 0 166
116 majk 163 0 14 0 0 149
117 supy 161 161 0 0 0 0
117 rainbow_tree 161 0 0 0 0 161
119 natsugiri 159 43 0 0 85 31
120 BigBag 158 0 7 31 10 110
121 I_love_Tanya_Romanova 157 0 157 0 0 0
122 Roundgod 154 0 76 0 78 0
123 SpyCheese 153 153 0 0 0 0
123 tribute_to_Ukraine_2022 153 0 0 0 153 0
123 receed 153 0 0 153 0 0
126 voidmax 152 0 125 0 27 0
127 heno239 149 0 0 99 0 50
128 mmaxio 145 145 0 0 0 0
128 Gullesnuffs 145 0 0 0 145 0
128 mHuman 145 0 0 145 0 0
131 Itst 144 0 99 45 0 0
132 Nazikk 142 0 142 0 0 0
132 hank55663 142 0 0 0 142 0
132 AghaTizi 142 142 0 0 0 0
135 riantkb 138 0 138 0 0 0
136 cz_yixuanxu 136 14 0 122 0 0
137 sevenkplus 135 0 0 0 135 0
137 vosptu 135 0 0 0 135 0
137 yuxiaogang 135 135 0 0 0 0
140 131131yhx 132 80 0 52 0 0
141 edisonhello 131 0 131 0 0 0
141 fyy2603 131 0 131 0 0 0
141 imeimi 131 0 0 0 0 131
144 Deemo 128 0 0 0 128 0
144 jiangly 128 0 0 0 0 128
146 craborac 127 0 54 68 0 5
147 KMAASZRAA 125 0 125 0 0 0
147 _rqy 125 125 0 0 0 0
147 Holidin 125 0 0 0 125 0
150 LayCurse 123 0 0 0 110 13
150 qwerty787788 123 0 0 107 0 16
152 irkstepanov 122 122 0 0 0 0
152 TadijaSebez 122 0 0 0 0 122
154 fuppy 120 0 62 58 0 0
155 never_giveup 119 0 0 0 119 0
155 jah_melon 119 119 0 0 0 0
155 Rzepa 119 0 119 0 0 0
158 orzdjq 116 0 0 0 116 0
158 JOHNKRAM 116 116 0 0 0 0
158 budalnik 116 0 0 0 0 116
161 Rebelz 114 0 17 0 0 97
162 Cyanic 112 52 60 0 0 0
163 cookiedoth 111 0 0 0 85 26
164 cuizhuyefei 110 0 52 0 58 0
164 allllekssssa 110 0 110 0 0 0
164 kazuma 110 110 0 0 0 0
167 SidneyEarth 108 0 36 72 0 0
168 QAQAutoMaton 107 70 0 0 0 37
169 weizhaohui 105 105 0 0 0 0
169 NoLongerRed 105 0 105 0 0 0
169 Rudy1444 105 0 0 105 0 0
169 nikolapesic2802 105 0 0 0 0 105
173 cescmentation_folch 104 0 0 0 52 52
174 knightL 102 0 0 26 76 0
174 pobiren 102 102 0 0 0 0
174 diamond_duke 102 0 0 102 0 0
174 just29 102 0 0 0 102 0
178 Aeon 99 0 0 0 99 0
178 Umi 99 0 0 0 0 99
180 Toxel 98 0 0 0 50 48
181 TangentDay 97 0 97 0 0 0
181 chenjb 97 0 97 0 0 0
183 Dmitriy.Belichenko 94 0 0 94 0 0
183 KADR 94 0 0 0 0 94
185 Danylo99 92 0 0 0 26 66
185 sugim48 92 92 0 0 0 0
185 DEGwer 92 78 0 14 0 0
185 Geothermal 92 0 0 0 0 92
189 Errichto 90 0 0 90 0 0
189 geniucos 90 90 0 0 0 0
189 EnumerativeCombinatorics 90 0 0 0 0 90
192 TimonKnigge 89 0 87 0 2 0
193 ataekOnOrigin 87 0 0 0 87 0
193 ToTLeS 87 87 0 0 0 0
193 tfg 87 0 87 0 0 0
193 Jatana 87 0 0 0 0 87
197 Noam527 85 0 0 85 0 0
198 KrK 84 0 0 80 4 0
199 andrewzta 83 0 0 0 0 83
200 orz 80 63 0 0 0 17
200 _Happy_New_Year_ 80 0 80 0 0 0
200 GaloisTears 80 0 0 0 0 80
203 risujiroh 78 0 0 8 70 0
204 Cekavis 76 0 0 76 0 0
204 blackbori 76 0 0 63 13 0
206 nuip 74 0 0 0 74 0
206 PinkRabbitAFO 74 0 0 74 0 0
208 kotamanegi 72 0 0 0 72 0
209 gtrhetr 70 0 0 70 0 0
209 flying_fish 70 0 70 0 0 0
209 ko_osaga 70 2 0 68 0 0
209 kektus 70 0 0 0 0 70
213 oversolver 68 68 0 0 0 0
213 AndreySergunin 68 0 0 0 68 0
213 Vergara 68 68 0 0 0 0
216 endless-chase 66 10 0 0 56 0
216 almogwald 66 0 0 0 66 0
216 djq_fpc 66 0 66 0 0 0
219 hermano95 63 0 63 0 0 0
219 ehnryx 63 0 0 0 0 63
221 hitonanode 62 0 0 0 62 0
221 laofudasuanbaofushehui 62 62 0 0 0 0
223 phongthan 60 0 0 60 0 0
223 kokokostya 60 0 60 0 0 0
223 PavelKunyavskiy 60 0 0 0 0 60
226 Farhod 58 58 0 0 0 0
226 Lewin 58 0 0 0 0 58
228 BlackPuppy 56 0 0 56 0 0
228 ShadowLight 56 0 0 0 0 56
230 superguymj 54 54 0 0 0 0
230 Jimanbanashi 54 0 0 0 54 0
230 Arpa 54 0 0 54 0 0
230 m1sch3f 54 0 0 0 0 54
234 GyojunYoun 53 17 0 0 0 36
235 zerokugi 52 52 0 0 0 0
235 catupper 52 0 0 52 0 0
237 Worteltje 50 0 50 0 0 0
237 kf11 50 0 50 0 0 0
239 imalyd 48 48 0 0 0 0
239 teapotd 48 0 7 41 0 0
239 pllk 48 0 0 0 48 0
239 ismagilov.code 48 0 0 0 0 48
243 zhangqingqi 46 27 0 0 0 19
243 Tommyr7 46 46 0 0 0 0
245 kobae964 45 0 45 0 0 0
245 wucstdio 45 0 0 0 45 0
245 JettyOller 45 45 0 0 0 0
248 Hamzqq9 43 0 0 43 0 0
248 RAVEman 43 0 0 0 0 43
250 wzp666 41 41 0 0 0 0
250 DPR-pavlin 41 0 0 0 41 0
250 -14 41 0 41 0 0 0
250 cjy2003 41 0 0 0 0 41
254 camypaper 39 39 0 0 0 0
254 atoiz 39 0 0 0 39 0
254 LJC00118 39 0 0 0 0 39
257 cdkplay 37 0 0 0 37 0
258 orbitingflea 36 0 36 0 0 0
258 logicmachine 36 36 0 0 0 0
260 zhou888 34 34 0 0 0 0
260 GoForIt 34 0 0 34 0 0
260 fram 34 0 0 0 34 0
260 Juve45 34 0 0 0 0 34
264 hloya_ygrt 32 32 0 0 0 0
265 chemthan 31 0 31 0 0 0
265 AnandOza 31 0 0 0 31 0
265 Hezhu 31 31 0 0 0 0
268 satashun 29 29 0 0 0 0
268 skrydg 29 0 0 0 29 0
268 ugly2333 29 0 0 29 0 0
268 why_no_girlfriend 29 0 29 0 0 0
268 Zayin 29 0 0 0 0 29
273 liujunhao 27 0 0 27 0 0
273 HanwhaEagles 27 0 27 0 0 0
273 PinkieRabbit 27 0 27 0 0 0
273 danya.smelskiy 27 0 0 0 0 27
277 gazelle 26 26 0 0 0 0
278 lawfung 24 0 0 0 24 0
278 244mhq 24 0 0 24 0 0
278 lzyrapx 24 24 0 0 0 0
281 Atreus 23 0 0 0 22 1
282 DAyamaCTF 22 22 0 0 0 0
282 hld67890 22 0 0 22 0 0
282 athin 22 0 22 0 0 0
282 yashChandnani 22 0 0 0 0 22
286 shadowatyy 21 0 0 21 0 0
286 cerberus97 21 21 0 0 0 0
286 Sonechko 21 0 21 0 0 0
286 lebowski998 21 0 0 0 21 0
290 WA_TLE 19 0 19 0 0 0
290 HuaJun 19 19 0 0 0 0
290 wjli 19 0 0 19 0 0
293 olphe 17 0 0 17 0 0
293 ashmelev 17 0 0 0 17 0
295 jijiang 16 0 16 0 0 0
295 FizzyDavid 16 16 0 0 0 0
295 xlk 16 0 0 0 16 0
298 gyz_gyz 14 0 14 0 0 0
298 includehdhd 14 0 0 0 14 0
298 Radko 14 0 0 0 0 14
301 mayaohua2003 13 0 0 13 0 0
302 adadadd 11 0 11 0 0 0
302 Shayan 11 0 0 11 0 0
302 Mustang98 11 0 0 0 11 0
302 AprilGrimoire 11 11 0 0 0 0
306 samjia2000 10 0 0 10 0 0
307 tempura0224 8 0 0 0 8 0
307 amnesiac_dusk 8 0 8 0 0 0
307 _h_ 8 0 0 0 0 8
310 Gaozijian 7 0 0 7 0 0
310 hugopm 7 0 0 0 0 7
312 lzr_010506 5 0 0 0 5 0
312 QAQT 5 0 0 5 0 0
314 zhouzhendongYa 4 0 4 0 0 0
314 alexbabalau 4 0 0 4 0 0
314 Tlatoani 4 0 0 0 0 4
317 Sulfox 2 0 2 0 0 0
318 gamegame 1 1 0 0 0 0
318 Toeto 1 0 0 1 0 0
318 rais.fathin38 1 0 1 0 0 0
318 xiaowuc1 1 0 0 0 1 0

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Codeforces Round 591 (and Technocup — Elimination Round 1)
By arsijo, 5 years ago, translation, In English

Hi all!

This weekend, on Oct/06/2019 18:05 (Moscow time) we will hold Codeforces Round 591. It is based on problems of Technocup 2020 Elimination Round 1 that will be held at the same time.

Technocup is a major olympiad for Russian-speaking high-school students, so if you fall into this category, please register at Technocup 2020 website and take part in the Elimination Round.

Div. 1 and Div.2 editions are open and rated for everyone. Register and enjoy the contests!

The Elimination Round authors are BledDest, MikeMirzayanov, Neon, awoo, Roms, adedalic and me. This round would also be not possible without the help of our testers: KAN, chemthan, gisp_zjz, Kallaseldor, Jeffrey, danya.smelskiy, Juve45, thank you so much!

Have fun!

UPD.

Unfortunately, the round is unrated.

Tutorial.

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Codeforces Global Rounds 2019: Current Results After Four Rounds
By arsijo, 5 years ago, In English

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 authors and problem testers.

The prizes for the 6-round series in 2019:

  • 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:

Place Contestant = Round 1 Round 2 Round 3 Round 4
1 tourist 2412 1000 706 706 0
2 mnbvmar 2225 497 403 1000 325
3 ainta 1353 135 0 218 1000
4 Um_nik 1281 706 575 0 0
5 LHiC 1217 277 0 443 497
6 sunset 1160 443 371 346 0
7 ecnerwala 1138 0 1000 138 0
8 Petr 1018 0 443 575 0
9 ksun48 940 371 198 371 0
10 Radewoosh 819 74 0 39 706
11 krijgertje 808 0 291 325 192
12 Egor 705 0 116 403 186
13 Reyna 703 5 41 254 403
14 webmaster 698 60 186 226 226
15 yutaka1999 683 186 0 497 0
16 tzuyu_chou 662 0 0 87 575
17 maroonrk 639 149 0 119 371
18 TLE 638 575 24 39 0
18 Endagorion 638 13 497 128 0
20 yokozuna57 548 74 325 149 0
21 fateice 518 307 211 0 0
22 whzzt 517 171 70 171 105
23 kmjp 443 226 46 0 171
23 Benq 443 0 0 0 443
25 lych_cys 436 218 218 0 0
26 lumibons 431 0 265 166 0
27 riadwaw 409 192 0 110 107
28 jqdai0815 403 403 0 0 0
29 aid 395 107 11 116 161
30 kczno1 390 83 0 307 0
31 neal 389 211 171 0 7
32 E869120 380 0 153 16 211
33 isaf27 379 56 0 32 291
34 ania 369 198 74 0 97
35 Elegia 363 85 0 97 181
35 izban 363 128 0 113 122
37 gop2024 360 0 0 125 235
38 Rewinding 346 0 346 0 0
38 molamola. 346 346 0 0 0
38 nhho 346 0 0 0 346
41 yfzcsc 344 37 0 0 307
42 Alex_2oo8 342 0 166 176 0
43 Kostroma 334 4 181 0 149
44 snuke 325 325 0 0 0
45 jonathanirvings 323 97 226 0 0
46 realDonaldTrunp 307 0 307 0 0
46 zemen 307 204 41 62 0
48 MofK 298 8 198 0 92
49 ATS 297 0 0 265 32
50 dreamoon_love_AA 294 0 90 0 204
51 RNS_CUS 291 0 0 291 0
51 V--o_o--V 291 291 0 0 0
53 zeliboba 289 0 45 244 0
54 G.Z.V.O.D.E.N 284 113 0 0 171
55 Hazyknight 282 0 78 204 0
56 betaveros 277 0 0 277 0
56 yhx-12243 277 0 277 0 0
56 MrDindows 277 0 0 0 277
59 eatmore 269 138 0 131 0
60 visitWorld 265 265 0 0 0
60 scott_wu 265 0 0 0 265
62 leaf1415 254 0 254 0 0
62 sigma425 254 254 0 0 0
62 DearMargaret 254 0 0 0 254
65 scanhex 249 0 92 157 0
66 Arterm 244 0 244 0 0
66 uwi 244 244 0 0 0
66 Swistakk 244 0 0 0 244
69 Subconscious 241 0 149 92 0
70 khsoo01 235 0 0 235 0
70 peltorator 235 0 235 0 0
70 dotorya 235 235 0 0 0
73 komendart 224 0 0 161 63
74 gepardo 218 0 0 0 218
75 Shanru 211 0 0 211 0
76 vammadur 204 0 204 0 0
77 dlalswp25 203 0 0 46 157
78 mareksom 201 99 102 0 0
79 Biden 198 0 0 198 0
79 Marcin_smu 198 0 0 0 198
81 TLEwpdus 197 0 161 0 36
81 Maksim1744 197 0 107 0 90
83 kdh9949 196 157 0 39 0
84 AFO_OFA 194 78 116 0 0
85 bicsi 192 0 0 192 0
86 Egor.Lifar 191 0 145 0 46
87 Merkurev 188 94 0 0 94
88 mango_lassi 186 0 0 48 138
88 gisp_zjz 186 0 0 186 0
90 renjingyi 181 0 0 181 0
90 calabash_grandfather 181 181 0 0 0
92 ilyakor 176 0 60 0 116
92 voover 176 176 0 0 0
92 hos.lyric 176 0 176 0 0
92 amethyst0 176 0 0 0 176
96 fedoseev.timofey 167 0 32 135 0
97 Sugar_fan 166 0 83 83 0
97 yosupo 166 166 0 0 0
99 supy 161 161 0 0 0
100 I_love_Tanya_Romanova 157 0 157 0 0
101 Roundgod 154 0 76 0 78
102 receed 153 0 0 153 0
102 SpyCheese 153 153 0 0 0
102 tribute_to_Ukraine_2022 153 0 0 0 153
105 voidmax 152 0 125 0 27
106 mmaxio 145 145 0 0 0
106 mHuman 145 0 0 145 0
106 Gullesnuffs 145 0 0 0 145
109 Itst 144 0 99 45 0
110 AghaTizi 142 142 0 0 0
110 Nazikk 142 0 142 0 0
110 Coder 142 0 0 142 0
110 hank55663 142 0 0 0 142
114 riantkb 138 0 138 0 0
115 cz_yixuanxu 136 14 0 122 0
116 VArtem 135 0 135 0 0
116 yuxiaogang 135 135 0 0 0
116 sevenkplus 135 0 0 0 135
116 vosptu 135 0 0 0 135
120 131131yhx 132 80 0 52 0
121 fyy2603 131 0 131 0 0
121 edisonhello 131 0 131 0 0
123 natsugiri 128 43 0 0 85
123 Deemo 128 0 0 0 128
125 _rqy 125 125 0 0 0
125 KMAASZRAA 125 0 125 0 0
125 Holidin 125 0 0 0 125
128 craborac 122 0 54 68 0
128 irkstepanov 122 122 0 0 0
130 fuppy 120 0 62 58 0
131 jah_melon 119 119 0 0 0
131 Rzepa 119 0 119 0 0
131 never_giveup 119 0 0 0 119
134 JOHNKRAM 116 116 0 0 0
134 orzdjq 116 0 0 0 116
136 Cyanic 112 52 60 0 0
137 allllekssssa 110 0 110 0 0
137 cuizhuyefei 110 0 52 0 58
137 kazuma 110 110 0 0 0
137 LayCurse 110 0 0 0 110
141 SidneyEarth 108 0 36 72 0
142 qwerty787788 107 0 0 107 0
143 NoLongerRed 105 0 105 0 0
143 Rudy1444 105 0 0 105 0
143 weizhaohui 105 105 0 0 0
146 Golovanov399 104 7 0 78 19
147 pobiren 102 102 0 0 0
147 knightL 102 0 0 26 76
147 diamond_duke 102 0 0 102 0
147 just29 102 0 0 0 102
151 heno239 99 0 0 99 0
151 Aeon 99 0 0 0 99
153 TangentDay 97 0 97 0 0
153 chenjb 97 0 97 0 0
155 Dmitriy.Belichenko 94 0 0 94 0
156 sugim48 92 92 0 0 0
156 DEGwer 92 78 0 14 0
158 Errichto 90 0 0 90 0
158 geniucos 90 90 0 0 0
160 TimonKnigge 89 0 87 0 2
161 tfg 87 0 87 0 0
161 ToTLeS 87 87 0 0 0
161 ataekOnOrigin 87 0 0 0 87
164 Noam527 85 0 0 85 0
164 cookiedoth 85 0 0 0 85
166 KrK 84 0 0 80 4
167 _Happy_New_Year_ 80 0 80 0 0
167 betrue12 80 0 0 0 80
169 risujiroh 78 0 0 8 70
170 Cekavis 76 0 0 76 0
170 blackbori 76 0 0 63 13
172 PinkRabbitAFO 74 0 0 74 0
172 nuip 74 0 0 0 74
174 Xellos 72 0 72 0 0
174 kotamanegi 72 0 0 0 72
176 gtrhetr 70 0 0 70 0
176 flying_fish 70 0 70 0 0
176 QAQAutoMaton 70 70 0 0 0
176 ko_osaga 70 2 0 68 0
180 Vergara 68 68 0 0 0
180 oversolver 68 68 0 0 0
180 AndreySergunin 68 0 0 0 68
183 djq_fpc 66 0 66 0 0
183 endless-chase 66 10 0 0 56
183 almogwald 66 0 0 0 66
186 orz 63 63 0 0 0
186 hermano95 63 0 63 0 0
188 laofudasuanbaofushehui 62 62 0 0 0
188 hitonanode 62 0 0 0 62
190 phongthan 60 0 0 60 0
190 kokokostya 60 0 60 0 0
190 beginend 60 0 0 0 60
193 Farhod 58 58 0 0 0
194 BlackPuppy 56 0 0 56 0
195 superguymj 54 54 0 0 0
195 Arpa 54 0 0 54 0
195 Jimanbanashi 54 0 0 0 54
198 catupper 52 0 0 52 0
198 zerokugi 52 52 0 0 0
198 cescmentation_folch 52 0 0 0 52
201 Worteltje 50 0 50 0 0
201 kf11 50 0 50 0 0
201 Toxel 50 0 0 0 50
204 teapotd 48 0 7 41 0
204 imalyd 48 48 0 0 0
204 BigBag 48 0 7 31 10
204 pllk 48 0 0 0 48
208 Tommyr7 46 46 0 0 0
209 JettyOller 45 45 0 0 0
209 kobae964 45 0 45 0 0
209 wucstdio 45 0 0 0 45
212 Hamzqq9 43 0 0 43 0
212 Torta 43 0 0 0 43
214 wzp666 41 41 0 0 0
214 -14 41 0 41 0 0
214 DPR-pavlin 41 0 0 0 41
217 camypaper 39 39 0 0 0
217 atoiz 39 0 0 0 39
219 cdkplay 37 0 0 0 37
220 orbitingflea 36 0 36 0 0
220 logicmachine 36 36 0 0 0
222 GoForIt 34 0 0 34 0
222 zhou888 34 34 0 0 0
222 fram 34 0 0 0 34
225 hloya_ygrt 32 32 0 0 0
226 chemthan 31 0 31 0 0
226 Hezhu 31 31 0 0 0
226 AnandOza 31 0 0 0 31
229 satashun 29 29 0 0 0
229 ugly2333 29 0 0 29 0
229 why_no_girlfriend 29 0 29 0 0
229 skrydg 29 0 0 0 29
233 PinkieRabbit 27 0 27 0 0
233 zhangqingqi 27 27 0 0 0
233 HanwhaEagles 27 0 27 0 0
233 liujunhao 27 0 0 27 0
237 gazelle 26 26 0 0 0
237 Danylo99 26 0 0 0 26
239 lzyrapx 24 24 0 0 0
239 244mhq 24 0 0 24 0
239 lawfung 24 0 0 0 24
242 athin 22 0 22 0 0
242 DAyamaCTF 22 22 0 0 0
242 hld67890 22 0 0 22 0
242 Atreus 22 0 0 0 22
246 Sonechko 21 0 21 0 0
246 shadowatyy 21 0 0 21 0
246 cerberus97 21 21 0 0 0
246 lebowski998 21 0 0 0 21
250 wjli 19 0 0 19 0
250 WA_TLE 19 0 19 0 0
250 HuaJun 19 19 0 0 0
253 olphe 17 0 0 17 0
253 GyojunYoun 17 17 0 0 0
253 Rebelz 17 0 17 0 0
253 ashmelev 17 0 0 0 17
257 jijiang 16 0 16 0 0
257 FizzyDavid 16 16 0 0 0
257 xlk 16 0 0 0 16
260 majk 14 0 14 0 0
260 gyz_gyz 14 0 14 0 0
260 includehdhd 14 0 0 0 14
263 mayaohua2003 13 0 0 13 0
264 Shayan 11 0 0 11 0
264 AprilGrimoire 11 11 0 0 0
264 adadadd 11 0 11 0 0
264 Mustang98 11 0 0 0 11
268 samjia2000 10 0 0 10 0
269 amnesiac_dusk 8 0 8 0 0
269 tempura0224 8 0 0 0 8
271 Gaozijian 7 0 0 7 0
272 QAQT 5 0 0 5 0
272 lzr_010506 5 0 0 0 5
274 zhouzhendongYa 4 0 4 0 0
274 alexbabalau 4 0 0 4 0
276 Sulfox 2 0 2 0 0
276 pashka 2 0 0 2 0
278 gamegame 1 1 0 0 0
278 Toeto 1 0 0 1 0
278 rais.fathin38 1 0 1 0 0
278 xiaowuc1 1 0 0 0 1

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Editorial of Codeforces Round #571 (Div. 2)
By arsijo, 5 years ago, In English
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Codeforces Round #571 (Div. 2)

By arsijo, 5 years ago, translation, In English

Hi everyone!

The rated Codeforces Round #571 (Div. 2) will take place on Jun/28/2019 11:20 (Moscow time). This round is based on the Kremenchuk Summer Programming Cup 2019.

The contest is prepared by Dalgerok, Karasick, stanislav.bezkorovainyi, antontrygubO_o, danya.smelskiy, and me.

You will have 2 hours and 15 minutes to solve 6 problems.

Good luck!

We apologize for the issue that happened with the problem B. The round is unrated. If you want to read my emotional reply about it, please read this.

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Forethought Future Cup — Final Round — Pictures
By arsijo, 6 years ago, In English

Hi everybody!

Lewin told me that they need a photographer for the FFC Final Round. Here I am!

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Lyft Level 5 Challenge 2018 — Final Round — Editorial
By arsijo, 6 years ago, In English
Tutorial is loading...

Author: arsijo

Developer: stanislav.bezkorovainyi

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Author: arsijo

Developer: stanislav.bezkorovainyi

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Author: stanislav.bezkorovainyi

Developer: stanislav.bezkorovainyi

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Author: Lewin

Developer: Lewin

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Author: Noam527

Developer: Noam527

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Author: Noam527

Developer: Noam527

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Author: Lewin

Developer: Lewin

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Author: _h_

Developers: _h_ and majk

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Lyft Level 5 Challenge 2018 — Final Round — Photos
By arsijo, 6 years ago, In English

Do you want pictures from the onsite round? Here it is.

Can you find me in these pictures?

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Lyft Level 5 Challenge 2018 — Final Round
By arsijo, 6 years ago, In English

Hi,

I am happy to announce that Lyft Level 5 Challenge 2018 — Final Round will be held in Palo Alto on Nov/04/2018 21:10 (Moscow time). The official round contains six problems and will last for two hours.

Winners will receive:

  • First place: $2000
  • Second place: $1000
  • Third place: $500

Here is the list of onsite finalists:

tourist LHiC scott_wu ksun48 Marcin_smu
matthew99 ecnerwala Kostroma RomaWhite Errichto
ACRush *ikatanic ilyakor Arterm zxqfl
desert97 Fdg neal KADR liympanda
LiChenKoh fmqjpt waterfall liymbear xiaowuc1
azneyes chenmark balakrishnan *YerzhanU

If you are interested in an internship or a job at Lyft, follow the link below.

Interested in an internship or a job at Lyft?

If you are not participating in the Final Round, you will be able to take part in rated open divisions. Each of them contains six problems and will last for two and a half hours.

This round was prepared by _h_, Lewin, majk, Noam527, stanislav.bezkorovainyi, and me.

Thank you to 300iq, cdkrot, BigBag, danya.smelskiy, Fekete, MrDindows, Nazikk, Sonechko, winger, MaxZubec for help with testing.

Special thanks to KAN for helping me with coordinating, MikeMirzayanov for Polygon and Codeforces, and Lyft for organizing this competition.

If you have never solved interactive problems before, please read this.

Scoring distribution:

Div1 and onsite:

750-1250-1500-2000-2750-3000

Div2:

500-1000-1750-2250-2500-3000

We have onsite issues, the contest was postponed by at least 5 minutes.

Because of the onsite round, the system testing will be in an hour after the round.

Contest is over!

Congratulations to the winners!

Onsite competition:

1 tourist
2 scott_wu
3 ecnerwala
4 RomaWhite
5 Errichto
6 ACRush
7 Arterm

Div 1:

1 Radewoosh
2 mnbvmar
3 Benq
4 DearMargaret
5 Reyna

Div 2:

1 mrscherry
2 Kekmaster
3 brandonzhang
4 ponda
5 ---Grigor---

Editorial is available here.

Are you looking for photos from the onsite round? It is here.

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Codeforces Round #495 (Div. 2) — Editorial
By arsijo, 6 years ago, In English
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Codeforces Round #495 (Div. 2)
By arsijo, 6 years ago, translation, In English

Hi everybody!

Summer... It is a wonderful time for traveling, walking with friends, new discoveries and, of course, writing new exciting contests at Codeforces. Thus, I bring to your attention my new Codeforces Round #495 (Div. 2) with interesting tasks that will take place on Jul/05/2018 19:35 (Moscow time). If your rating is less than 2100, this round will be rated for you; otherwise, you can participate out of competition.

I would like to thank Mike MikeMirzayanov Mirzayanov for his help with problems preparing and for Codeforces and Polygon platforms. Also, Ildar 300iq Gainullin, Dmitry cdkrot Sayutin, Daniil danya.smelskiy Smelskiy, Chin-Chia eddy1021 Hsu, and Kevin ksun48 Sun for the problems testing.

You will be given 6 problems and 2 hours to solve them. Scoring distribution will be announced later.

In this round, you will have to help Sonya with her daily problems. Good luck!

UPD. Scoring 500-1000-1500-2000-2500-3000.

UPD. Congratulations to winners!!!!

Rank Nickname Score
1 EZ_fwtt08 7892
2 milisav 5550
3 VisJiao 5294
4 Jatana 4832
5 wasyl 4762

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IOI 2018. Ukrainian selections
By arsijo, 6 years ago, In English

Hi everyone,

The Ukrainian selections have just started. Nine people have a chance to participate at IOI 2018, but only four contestants with the highest scores will be selected to IOI.

This blog contains main information about the contestants and the selections. Also, you can watch online standings during the competition.

Here is a short table. The full table is available here.

Place Score English name Ukrainian name Codeforces nickname Attempts left
1 1503 Sofiia Melnyk Мельник Софія Валентинівна Sonechko 2
2 1400 Adalbert Makarovych Макарович Адальберт Віталійович Adalbert 0
3 1333 Daniil Smelskiy Смельський Даніїл Сергійович danya.smelskiy 0
4 1210 Nazarii Denha Деньга Назарій Олександрович Nazikk 1
5 1196 Marko Hryshechkin Гришечкін Марко Сергійович Markellonchik 0
6 991 Illia Koval Коваль Ілля Андрійович kilt_01 0
7 741 Artur Kravtsov Кравцов Артур Андрійович 0
8 673 Daniil Ostashev Осташев Данііл Олександрович Stroustrup 1
9 434 Kostiantyn Lutsenko Луценко Костянтин Олександрович KostasKostil 1

UPD. It is time to show you people who helped to prepare and test problems:

UPD. Selections are over. The Ukrainian National team consists of:

  1. Sofiia Sonechko Melnyk
  2. Adalbert Adalbert Makarovych
  3. Daniil danya.smelskiy Smelskiy
  4. Nazarii Nazikk Denha

Congratulations and good luck in Japan!

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Selections for IOI in Ukraine
By arsijo, 8 years ago, In English

Ukrainian Seletions for IOI starts today (the 19th of April). There are 19 participants, 8 of us have chance to present our country in IOI in Tehran. I will try to update table after every tour (there will be 6 tours). You can find full table made by MStrechen.

Short table after 6 days:

Place Score Name Codeforces nickname Grade
1 1920 Anton Tsypko arsijo 11
2 1458 Stanislav Tomash giraffeh 11
* 1365 Sofia Melnyk Sonechko 8
* 1297 Ihor Barenblat Barichek 11
3 1160 Illia Koval kilt_01 10
* 1112 Adalbert Makarovych Adalbert 10
* 1058 Daniil Smelskiy danya.smelskiy 10
4 1040 Nazarii Denha Nazikk 9
5 1038 Matvii Strechen MStrechen 11
* 1038 Marko Hryshechkin Markellonchik 10
6 1027 Yuliia Zdanovska Julia_123 11
7 902 Daniil Ostashev 9
* 753 Artur Kravtsov 10
* 702 Serhii Mazajew BagInCode 10
* 690 Maxim Nikitenko Karasick 9
8 370 Denys Slobodianiuk 9
* 352 Kostiantyn Lutsenko 9
* 272 Bohdan Vakhitov bondanvak 10
* 260 Maksym Oboznyi MaksymOboznyi 8

UPD. Selections are over.

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Codeforces Round #371
By arsijo, 8 years ago, translation, In English

Hi everybody!

Codeforces Round #371 takes place on 13 September at 19:35 MSK for the both divisions. This is our first round and we hope it won't the last one.

This round is prepared by me (Anton Tsypko) and Sonechko (Sofia Melnyk). We want to say thanks to GlebsHP (Gleb Evstropov) and Sereja (Sergey Nagin) for help with preparation of this round, MikeMirzayanov (Mike Mirzayanov) for Codeforces and Polygon systems, iSlava (Viacheslav Ocheretnyi), AllCatsAreBeautiful (Mark Mikhno), BigBag (Matvey Aslandukov), winger (Vladislav Isenbaev) and AlexFetisov (Alex Fetisov) for testing problems.

It's recommended for both divisions to read the Interactive Problems Guide before the round. Scoring distribution will be published right before the start of the contest.

Good luck!

Scoring:

Div 2: 500 — 1000 — 1000 — 2000 — 3000

Div 1: 500 — 1000 — 2000 — 2000 — 2000

Upd: Congratulations to the winners:

Div 1:

  1. geniucos
  2. Herzu
  3. Endagorion
  4. Um_nik
  5. Radewoosh

Div 2:

  1. fanache99
  2. amethyst0
  3. Gromah
  4. serlis
  5. Jason_zjj3

Editorial.

UPD: We are sorry that Div 1 C is very similar to this, but the contest will be rated.

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