We will hold Luogu Round 208 on Luogu. This is a Div.3 Round and English statement will be provided officially.

• Contest URL: https://www.luogu.com.cn/contest/183429
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20241123T14&p1=237
• Duration: 240 minutes
• System: IOI
• Difficulty: Div.3
• Staffs: TBD
• Special Thanks: steven_yummy, E.Space
• Rated range: <=1600 rating on Luogu
• Score Distribution: 100-100-100-100-100

We are looking forward to your participation! English statement will be provided officially.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

We will hold 【MX-S5】Mengxiong Weekly (Open) on Luogu. This is a "Div.1.5" round provided by our collaborator. If you cannot understand Chinese, ChatGPT may be helpful.

This contest is a simulation test for Chinese NOIP, which is the provincial competitive programming contest for Chinese middle school students and is a must-participate contest for them. At least 7620 participants will attend NOIP this year.

This contest is not full-feedback. You will not receive the results during the contest, and the score of each problem is only dependent on your last submission.

• Contest URL: https://www.luogu.com.cn/contest/211087
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20241109T0830&p1=237
• Duration: 270 minutes
• Difficulty: similar to NOIP, which is similar to "Div.1.5"
• Writer & Tester: 275307894a, lizhous, Kares, YuJiahe, Otomachi_Una, Liuxizai
• Score Distribution: 100-100-100-100
• Rated Range: Unrated on Luogu

We are looking forward to your participation! If you cannot understand Chinese, ChatGPT may be helpful.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

We will hold Luogu Round 204 on Luogu. This is a Div.2 Round and English statement will be provided officially.

• Contest URL: https://www.luogu.com.cn/contest/187558
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20241102T14&p1=237
• Duration: 240 minutes
• System: IOI
• Difficulty: Div.2
• Staffs:
  • Coordinator: Little09
  • Writer: wyrqwq
  • Testers: jason_sun, 251Sec, N_z__, LMydd0225, Ternary_Tree_, sszcdjr, SkyWave2022, Imdie, DitaMirika, Lastiy124, superyijin_txdy, MatchingGraph, cayaxi09, liaoyifan, Tricopter, acwing_gza, Syxqwq, fzx, hyman00, SpadeA261, Coffee_zzz, Error_Yuan, IwannaEATaCUTEcaca-qwq, Const_int, Physics212303, EasonTAO, PEIMUDA
  • Also thanks kkksc03 for the Luogu platform, and MikeMirzayanov for the great Polygon platform.
• Rated range: <=2000 rating on Luogu
• Score Distribution: 100-100-100-100

We are looking forward to your participation! English statement will be provided officially.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

We will hold 【MX-S4/J8】Mengxiong Weekly (Open) on Luogu. This is a Div.2+Div.3 round provided by our collaborator. If you cannot understand Chinese, ChatGPT may be helpful.

This contest is not full-feedback. You will not receive the results during the contest, and the score of each problem is only dependent on your last submission.

• Contest URL:
  • Div.3: https://www.luogu.com.cn/contest/203481
  • Div.2: https://www.luogu.com.cn/contest/203482
• Start time:
  • Div.3: https://www.timeanddate.com/worldclock/fixedtime.html?msg=MXJ8&iso=20241020T0830&p1=237
  • Div.2: https://www.timeanddate.com/worldclock/fixedtime.html?msg=MXS4&iso=20241020T1430&p1=237
  • Note that Div.3 and Div.2 start at different time. The problems are distinct so you can participate both contests.
• Writers & Testers:
  • Div.3: Yurz2010, zzzrrrccc, wyrqwq, Gemini7X, cayaxi09
  • Div.2: wcyived, allenj, FYC090118, Harry27182, Include_Z_F_R_, hhoppitree
• Score Distribution: 100-100-100-100 for each contest.

We are looking forward to your participation! If you cannot understand Chinese, ChatGPT may be helpful. We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

Hello, Codeforces.

I'm Coffee_zzz. To celebrate my 15th birthday, I hold a contest on Luogu.

• Contest URL: https://www.luogu.com.cn/contest/205839
• Contest Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20241019T1330&p1=237
• System: IOI
• Duration: 210 minutes
• Difficulty: Codeforces Div.3-Div.2
• Coordinator: Coffee_zzz
• Testers: xuwt, dXqwq, rui_er, frostaur_, acwing_gza, shiqingbaiya666, monster_hunter, McIron233, andychen2012, MSTqwq, wyrqwq, Nahidameow, shinzanmono, _saixingzhe_, E.Space, VinstaG173
• Score Distribution: 100-100-100-100

I'm looking forward to your participation! English statement will be provided officially.

• A tutorial on using Luogu

CSP-J/S is the most influential informatics competition in China. This year, over 250,000 candidates participated in CSP-J/S, and more than 50,000 candidates are estimated to take part in the second round of the exam. To help contestants prepare for CSP-J/S, Luogu has organized a simulation test. Contestants are welcome to familiarize themselves with the types and difficulties of tasks or get acquainted with the algorithm competition environment in China.

In this contest, the statements in PDF, both in Chinese and in English, will be provided. One can download the PDF version in the attachment of task A. Moreover, samples will be provided in the attachment of each task.

This contest is not full-feedback. You will not receive the results during the contest, and the score of each problem is only dependent on your last submission.

• Contest URL:
• CSP-J simulation test (mainly for candidates aged 8-14): https://www.luogu.com.cn/contest/200686
  — Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?msg=CSP-J&iso=20241013T0830&p1=237
  — Duration: 210 minutes
  — Rated range: <=1600 rating on Luogu
• CSP-S simulation test (mainly for candidates aged 10-18): https://www.luogu.com.cn/contest/200849
  — Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?msg=CSP-S&iso=20241013T1430&p1=237
  — Duration: 240 minutes
  — Rated range: for all rating on Luogu
• Writer & Tester: GrandSouris, sszcdjr, Error_Yuan, Otomachi_Una, b6e0, N_z__, MatrixGroup, Graygoo_401, wyrqwq, E.Space, steven_yummy, jimmyywang, Inkyo, rui_er, Micro_Sun, jiangyixian1, cyxzzpforever
• The points value: 100-100-100-100

We are looking forward to your participation! English statement will be provided officially. We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

We will hold 【MX-X6/J7】Mengxiong Weekly (Open) on Luogu. This is a Div.1+Div.3 round provided by our collaborator. If you cannot understand Chinese, ChatGPT may be helpful.

• Contest URL:
  • Div.1: https://www.luogu.com.cn/contest/200833
  • Div.3: https://www.luogu.com.cn/contest/200834
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20241003T1330&p1=237
• Duration: 270 minutes
• System: IOI
• Difficulty: Similar to Codeforces Div.1 and Div.3
• Writer & Tester: Sol1, ChenKaifeng, A_zjzj, hhoppitree
• Rated Range: Unrated on Luogu
• The points value:
  • Div.1: 100-100-100-100-100-100
  • Div.3: 100-100-100-100-100
  • The Div.3C will be Div.1A, Div.3D will be Div.1B, etc.

We are looking forward to your participation! If you cannot understand Chinese, ChatGPT may be helpful. We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

We will hold Luogu Round 197 on Luogu. This is a Div.2 round and English statement will be provided officially.

• Contest URL: https://www.luogu.com.cn/contest/179008
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?msg=LGR-198&iso=20241002T14&p1=237
• Duration: 240 minutes
• System: IOI
• Difficulty: Div.2
• Writers & Testers: waauto, RobertoFirmino, Watersphere, starrykiller, LG805653, Yaimsea, minsi, JueFan, monster_hunter, frostaur_, E.Space(our coordinator)
• Rated range: <=2000 rating on Luogu
• The points value: 100-(50-50)-100-100
• The contest contains $$$x (x\in [0,5])$$$ interactive problems.

We are looking forward to your participation! English statement will be provided officially. We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

UPD: Due to network issue, this contest is extended for 30 minutes.

We will hold 【MX-X5/J6】Mengxiong Weekly (Open) on Luogu. This is a Div.1+Div.3 round provided by our collaborator. If you cannot understand Chinese, ChatGPT may be helpful.

• Contest URL:
  • Div.1: https://www.luogu.com.cn/contest/198974
  • Div.3: https://www.luogu.com.cn/contest/198975
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20240928T1330&p1=237
• Duration: 270 minutes
• System: IOI
• Difficulty: Similar to Codeforces Div.1 and Div.3
• Writer & Tester: 10circle, QwQwf, Ender32k, JWRuixi, zltzlt, sinsop90, flying
• Rated Range: Unrated on Luogu
• The points value:
  • Div.1: 100-100-100-100-100-100
  • Div.3: 100-100-100-100-100
  • The Div.3C will be Div.1A, Div.3D will be Div.1B, etc.

We are looking forward to your participation! If you cannot understand Chinese, ChatGPT may be helpful. We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

We will hold Luogu Round 198 on Luogu. This is a Div. 3 round and English statement will be provided officially.

• Contest URL: https://www.luogu.com.cn/contest/163361
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?msg=LGR-199&iso=20240922T14&p1=237
• Duration: 210 minutes
• System: IOI
• Difficulty: CSP-J(see this blog), easier than Codeforces Div.3 (but still harder than Div.4)
• Writers & Testers: Imdie, juan_123, Cuby_code, caoyiyang114514, cayaxi09, FL_sleake, steven_yummy, E.Space
• Rated range: <=1600 rating on Luogu
• The points value: 100-100-100-100

We are looking forward to your participation! English statement will be provided officially. We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

We will hold 【MX-X3/J4】Mengxiong Weekly (Open) on Luogu. This is a Div.1+Div.3 round provided by our collaborator. If you cannot understand Chinese, ChatGPT may be helpful.

• Contest URL:
  • Div.1: https://www.luogu.com.cn/contest/196629
  • Div.3: https://www.luogu.com.cn/contest/196630
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20240908T1330&p1=237
• Duration: 270 minutes
• System: IOI
• Difficulty: Similar to Codeforces Div.1 and Div.3
• Writer & Tester: Const_int, Ternary_Tree_, MatrixGroup, Alan_dong, Leasier, wyrqwq, Sol1, StarSilk
• Rated Range: Unrated on Luogu
• The points value:
  • Div.1: 100-100-100-100-100-100
  • Div.3: 100-100-100-100-100
  • The Div.3C will be Div.1A, Div.3D will be Div.1B, etc.

We are looking forward to your participation! If you cannot understand Chinese, ChatGPT may be helpful. We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

We will hold Luogu Round 198 on Luogu. This is a Div. 3 round and English statement will be provided officially.

• Contest URL: https://www.luogu.com.cn/contest/157920
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?msg=LGR-198&iso=20240907T1400&p1=237
• Duration: 240 minutes
• System: IOI
• Difficulty: CSP-J(see this blog), easier than Codeforces Div. 3 (but still harder than Div. 4)
• Writers & Testers: fft_ntt, acwing_gza, the___, jason_sun, zxh923, wyrqwq, zhuweiqi_OMG, liujiameng, lyl2021, steven_yummy, E.Space
• The contest is made possible with our cutest mascot YuZeAn's help!
• Rated range: <=1600 rating on Luogu
• The points value: 100-100-100-100

We are looking forward to your participation! English statement will be provided officially. We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

We will hold 【MX-J3】Mengxiong Weekly (Open) on Luogu. This is a Div. 3 round provided by our collaborator. If you cannot understand Chinese, ChatGPT may be helpful.

• Contest URL: https://www.luogu.com.cn/contest/193566
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?msg=MX-J3&iso=20240825T1400&p1=237
• Duration: 240 minutes
• System: IOI
• Difficulty: CSP-J (see this blog), easier than Codeforces Div. 3 (but still harder than Div. 4)
• Writer & Tester: steven_yummy , rui_er , Liuxizai , cayaxi09
• Rated range: Unrated on Luogu
• The points value: 100-100-100-100-100- 1 (a hard version of one problem in the contest)

We are looking forward to your participation! If you cannot understand Chinese, ChatGPT may be helpful. We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

We will hold 【MX-S3】Mengxiong Weekly & FeOI Round 1 (Open) on Luogu. This is a Div. 2 round provided by our collaborator. If you cannot understand Chinese, ChatGPT may be helpful.

• Contest URL: https://www.luogu.com.cn/contest/191182
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?msg=MX-S3&iso=20240817T14&p1=237
• Duration: 240 minutes
• System: IOI
• Difficulty: Similar to the last 4 problems of Div. 2
• Writer: hhoppitree, A_zjzj, AK-Dream, lizhous, TianTian2008, lovely-ckj, Lyz09, YuJiahe
• Rated range: Unrated on Luogu
• Score Distribution: 100-100-100-100

We are looking forward to your participation! If you cannot understand Chinese, ChatGPT may be helpful. We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

We will hold JRKSJ Round 9 &「KDOI」Round 7 on Luogu. This is a high-quality unofficial contest on Luogu.

• Contest URL:
• Div. 1: https://www.luogu.com.cn/contest/167920
• Div. 2: https://www.luogu.com.cn/contest/187338
• Start time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20240815T1400&p1=237
• Duration: 270 minutes
• System: IOI
• Difficulty: Similar to the last 4 problems of Codeforces Div. 1/2 (respectively)
• Writer: wyrqwq, sail_with_pleasure, Otomachi_Una, dqstz, sszcdjr
• Tester: cyffff and above.
• Special thanks to orzdevinwang for developing some of the problems.
• Rated range: Div. 2 is rated for those whose Luogu rating less than 2200. Div. 1 is rated for all.
• Score Distribution: 100-100-100-100-100-100.

We are looking forward to your participation! If you cannot understand Chinese, ChatGPT may be helpful. We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

We will hold 【MX-X2】Mengxiong Weekly (Open) on Luogu. This is a Div. 1+2 round provided by our collaborator. If you cannot understand Chinese, ChatGPT may be helpful.

• Contest URL: https://www.luogu.com.cn/contest/188966
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?msg=MX-S2&iso=20240810T1330&p1=237
• Duration: 270 minutes
• System: IOI
• Difficulty: Div. 1+2
• Writer & Tester: Ternary_Tree_, SpadeA261, McIron233, Nahidameow, A_zjzj, 275307894a, AK-Dream, Coffee_zzz, rui_er, shiqingbaiya666
• Rated range: Unrated on Luogu
• The points value: TBD

We are looking forward to your participation! If you cannot understand Chinese, ChatGPT may be helpful. We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

We will hold 【MX-J2】Mengxiong Weekly (Open) on Luogu. This is a Div. 3 round provided by our collaborator. If you cannot understand Chinese, ChatGPT may be helpful.

• Contest URL: https://www.luogu.com.cn/contest/186933
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?msg=MX-J2&iso=20240804T1330&p1=237
• Duration: 210 minutes
• System: IOI
• Difficulty: CSP-J (see this blog), easier than Codeforces Div. 3 (but still harder than Div. 4)
• Writer & Tester: zltzlt, sinsop90, QwQwf, cyh_toby
• Rated range: Unrated on Luogu
• The points value: 100-100-100-100-100

We are looking forward to your participation! If you cannot understand Chinese, ChatGPT may be helpful. We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

We will hold Luogu Round 195 on Luogu. This is a Div. 3 round and English statement will be provided officially.

• Contest URL: https://www.luogu.com.cn/contest/157929
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?msg=LGR-195&iso=20240803T1430&p1=237
• Duration: 210 minutes
• System: IOI
• Difficulty: CSP-J(see this blog), easier than Codeforces Div. 3 (but still harder than Div. 4)
• Writer & Tester: ScaredQiu, Ycyofmine, iL.nayR, onomnaznihs, Coffee_zzz, wyrqwq, acwing_gza, steven_yummy, E.Space
• Rated range: <=1600 rating on Luogu
• The points value: 100-100-100-100

We are looking forward to your participation! English statement will be provided officially. We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

• A tutorial on using Luogu
• A brief introduction to Chinese NOI

We will hold 【MX-S2】Mengxiong Weekly Senior Round 2 (Open) Announcement on Luogu.

• Contest URL: https://www.luogu.com.cn/contest/184989
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20240727T14&p1=237
• Duration: 240 minutes
• System: IOI
• Difficulty: CSP-S(see this blog), easier than Codeforces Div. 1 (but still be equal to or harder than Div. 2)
• Writer & Tester: sycqwq, MX_muxi, MagicalFlower, Liuxizai
• Rated range: Unrated on Luogu
• The points value: 100-100-100-100

We are looking forward to your participation! If you cannot understand Chinese, ChatGPT may be helpful. We may provide English statement since the next LGR round above Div. 3.

We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

Here is the link of unofficial Chinese solutions provided by the contestants. You may use ChatGPT to translate them into English:

• Problem A: https://www.luogu.com.cn/problem/solution/P10810
• Problem B: https://www.luogu.com.cn/problem/solution/P10811 (There is still no solutions provided at this time)
• Problem C: https://www.luogu.com.cn/problem/solution/P10812
• Problem D: https://www.luogu.com.cn/problem/solution/P10813

We will hold 【MX-J1】Mengxiong Weekly: Flanksy Round III (Open) on Luogu.

• Contest URL: https://www.luogu.com.cn/contest/181138
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20240714T14&p1=237
• Duration: 210 minutes
• System: IOI
• Difficulty: CSP-J(see this blog), easier than Codeforces Div. 3 (but still harder than Div. 4)
• Writer & Tester: onomnaznihs, iL.nayR, ScaredQiu, cyh_toby
• Rated range: Unrated on Luogu
• The points value: 100-100-100-100

We are looking forward to your participation! If you cannot understand Chinese, ChatGPT may be helpful. We are working on establishing an English platform, but it takes time. We plan to complete this task by the end of 2024 or early 2025.

A tutorial on using Luogu.

We will hold Luogu Round 193 on Luogu.

• Contest URL:
• Div. 1: https://www.luogu.com.cn/contest/178773
• Div. 2: https://www.luogu.com.cn/contest/178774
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20240713T1400&p1=237
• Duration: 240 minutes
• Difficulty: similar to Codeforces Div. 1/2
• Writer and tester: shiqingbaiya666, frostaur_, sail_with_pleasure, PCT2506
• Coordinator: E.Space(NOI 2018 Gold Medal), zhiyangfan(NOI 2022, 2023 Silver Medal)
• Rated range: Div. 2 is rated for those whose Luogu rating less than 2000. Div. 1 is rated for all. (Here, we are sorry to say that the 【MX-X1】 is actually unrated on Luogu.)
• The point values: 100-100-100-100-100-100.

We are looking forward to your participation! If you cannot understand Chinese, ChatGPT may be helpful.

• A tutorial on using Luogu

• A brief introduction to Chinese NOI

We will hold 【MX-X1】梦熊周赛 · 未来组 1 |「KDOI」Round 5（同步赛）(which is a synchronized contest on the newly emerging online judge MXOJ, and problems are provided by the group KDOI) on Luogu.

• Contest URL: https://www.luogu.com.cn/contest/179392
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20240707T1400&p1=237
• Duration: 270 minutes
• System: IOI
• Difficulty: Codeforces (Div. 1+2)
• Writer: sszcdjr, Otomachi_Una, Error_Yuan.
• Tester: sszcdjr, Otomachi_Una, Error_Yuan, Ternary_Tree_, wyrqwq, 275307894a, A_zjzj.
• Coordinator: hualian.
• Rated range: for all
• The point values: 100-100-100-100-100-100.

We are looking forward to your participation! If you cannot understand Chinese, ChatGPT may be helpful.

UPD: The original contest (on MXOJ) can be visited here.

UPD2: Contest is end! The English statements are here.