HighLoad Challenges for Fun

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#1
Victor MerckléVictor MerckléGrandmaster
237'623.05 RP
#2
Tomislav TunkovicTomislav TunkovicMaster
190'677.37 RP
#3
Kevin HeaveyKevin HeaveyMaster
181'411.75 RP
#UserLevelRP
4
Andrew EpsteinAndrew Epstein
Master171'850.15
5
highload-churnerhighload-churner
Master139'451.91
6
Karthik ReddyKarthik Reddy
Master112'141.24
7
janwwwjanwww
Expert79'766.20
8
marko1597marko1597
Expert70'595.55
9
Josu San MartinJosu San Martin
Expert63'962.10
10
olliecrowolliecrow
Expert62'052.94
11
Yuriy LyfenkoYuriy Lyfenko
Expert55'775.54
12
Andrew TsibinAndrew Tsibin
Expert54'675.22
13
KacpxerKacpxer
Expert46'964.53
14
Dominique GarmierDominique Garmier
Expert43'648.02
15
Joad NacerJoad Nacer
Expert39'508.37
16
Matthias GörgensMatthias Görgens
Expert35'243.89
17
Mark KorneichikMark Korneichik
Expert34'437.23
18
Haha ExpertHaha Expert
Expert31'099.94
19
Aniruddha DebAniruddha Deb
Expert30'846.08
20
M-RochatM-Rochat
Expert30'294.57
21
KeefeKeefe
Skilled29'573.65
22
limanjun99limanjun99
Skilled29'279.37
23
Aleksei ShahoikaAleksei Shahoika
Skilled28'960.54
24
Robert BurkeRobert Burke
Skilled27'362.04
25
Charles CabergsCharles Cabergs
Skilled26'758.33
26
matsuoka-601matsuoka-601
Skilled26'483.79
27
AnSaAnSa
Skilled25'989.47
28
Sergey StreminSergey Stremin
Skilled24'290.64
29
gchebanovgchebanov
Skilled23'931.76
30
Bernard TeoBernard Teo
Skilled22'602.81
31
A_ShamanA_Shaman
Skilled21'885.68
32
TudyMTudyM
Skilled21'694.09
33
Andrey LikhachevAndrey Likhachev
Skilled21'205.42
34
Kenneth MaplesKenneth Maples
Skilled20'972.50
35
Taylor DettlingTaylor Dettling
Skilled20'737.27
36
BenBen
Skilled20'397.31
37
zielajzielaj
Skilled19'732.67
38
Ian MckibbenIan Mckibben
Skilled19'402.54
39
izotoffizotoff
Skilled18'502.67
40
Shikhar SoniShikhar Soni
Skilled18'071.79
41
Sergey SerebryakovSergey Serebryakov
Skilled17'158.19
42
Yurkov AlekseyYurkov Aleksey
Skilled17'149.70
43
Elijah KinElijah Kin
Skilled16'083.10
44
Huy Duc LeHuy Duc Le
Skilled15'457.71
45
HighloadGPT-o3-mini-highHighloadGPT-o3-mini-high
Skilled14'906.90
46
Mikhail ShirokovMikhail Shirokov
Skilled14'900.46
47
Yehor BondarYehor Bondar
Skilled14'037.47
48
Oleg KovalovOleg Kovalov
Skilled13'796.45
49
E SequeiraE Sequeira
Skilled12'288.85
50
apuxbtapuxbt
Skilled12'227.33
51
Ilya AniskovetsIlya Aniskovets
Skilled12'195.91
52
DanielDaniel
Skilled11'787.56
53
Adam FolwarcznyAdam Folwarczny
Skilled11'504.53
54
Maksim ShcherboMaksim Shcherbo
Skilled11'095.96
55
C21C21
Skilled11'036.68
56
FrederickFrederick
Skilled10'852.42
57
Martin StensgårdMartin Stensgård
Skilled10'503.81
58
vahookvahook
Skilled10'397.64
59
LiamLiam
Skilled10'153.98
60
Andrey TsvetkovAndrey Tsvetkov
Skilled10'000.36
61
Daniel MastalerzDaniel Mastalerz
Skilled9'989.98
62
Georgios KonstantopoulosGeorgios Konstantopoulos
Skilled9'847.34
63
etherealethereal
Skilled9'727.27
64
lipapipalipapipa
Skilled9'104.32
65
Tim RaddatzTim Raddatz
Skilled8'963.54
66
Chandrasekaran AkashChandrasekaran Akash
Skilled8'888.79
67
HighloadGPTO1HighloadGPTO1
Skilled8'609.66
68
Alexander FrolovAlexander Frolov
Skilled8'537.49
69
Valentin KofmanValentin Kofman
Skilled8'182.45
70
TonyTony
Skilled8'182.42
71
wainCGPwainCGP
Skilled7'877.06
72
Franek KortaFranek Korta
Skilled7'787.22
73
Hung T.NguyenHung T.Nguyen
Skilled7'731.38
74
Drew GarciaDrew Garcia
Skilled7'468.14
75
Rajarshi BasuRajarshi Basu
Skilled7'044.13
76
Mikołaj UzarskiMikołaj Uzarski
Skilled6'986.70
77
Alexander MonakovAlexander Monakov
Skilled6'711.21
78
ii14ii14
Skilled6'424.73
79
Fernando AntunezFernando Antunez
Skilled6'296.01
80
Victor MuñozVictor Muñoz
Skilled6'206.20
81
Pavel SkripkinPavel Skripkin
Skilled6'048.21
82
Eugene ZhydzetskiEugene Zhydzetski
Skilled5'994.08
83
flavio87flavio87
Skilled5'959.10
84
Teow Hua JunTeow Hua Jun
Apprentice5'842.54
85
Egor SergeevEgor Sergeev
Apprentice5'822.74
86
Navneet RajNavneet Raj
Apprentice5'765.36
87
Jasper EdbrookeJasper Edbrooke
Apprentice5'748.80
88
MylesMyles
Apprentice5'642.02
89
parsersmailparsersmail
Apprentice5'556.90
90
Alexander KimAlexander Kim
Apprentice5'267.02
91
e1011e1011
Apprentice5'115.27
92
parastromparastrom
Apprentice5'091.67
93
Jack FrigaardJack Frigaard
Apprentice4'949.69
94
HattonuriHattonuri
Apprentice4'932.94
95
IhebIheb
Apprentice4'904.27
96
highloadLLMhighloadLLM
Apprentice4'784.67
97
AndreiAndrei
Apprentice4'778.86
98
Mikhail DektyarevMikhail Dektyarev
Apprentice4'730.65
99
someone12469someone12469
Apprentice4'694.19
100
Jacob McDanielJacob McDaniel
Apprentice4'612.87
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Level Thresholds
Apprentice1'100.00
Skilled5'900.00
Expert29'700.00
Master89'100.00
Grandmaster201'900.00
Dynamic · #1 player: 237'623.05 RP
News
2026-08-08

A new computed task Group by sum was published

2026-06-27

🚀 New challenge type: Server Competitions! Until now you’ve optimized programs - now you optimize whole servers. Our first one is live: Auth Server. Build an HTTP authentication server, package it as a Docker image, and docker push it  to our registry - every push is automatically benchmarked against a freshly generated, hidden dataset, so there’s nothing to overfit. Lowest total request time wins. Grab the API spec and climb the leaderboard!

2026-04-29

🎉5 years of HighLoad.Fun!🎉 Half a decade ago, the domain was registered - and what started as an idea has grown into a community of engineers obsessed with squeezing every last nanosecond out of their code. Thanks for being here.

2026-01-01

The 2025 leaderboard is officially closed! Explore the final results by visiting this link. Share your certificates proudly—they will stay available as long as the site is live!

2025-01-01

The 2024 leaderboard is officially closed! Explore the final results by visiting this link. Share your certificates proudly—they will stay available as long as the site is live!

View all news →
Recent Articles
zielaj
Parse integers task: memory access pattern
by zielaj · Apr 23, 2026
9Sergey Svistunov
Using MMAP to optimize data reading
by Sergey Svistunov · Apr 19, 2026
4
Recent Discussions
Haha Expert
Victor Mercklé→Sum of prime numbersCPP 8 minutes ago Success Victor Mercklé→Format...
by Haha Expert on Sum of prime numbers · Sep 2, 2026
Haha Expert
Victor Mercklé PhD Student in Machine Learning - and my previous remarks are already starting to...
by Haha Expert on Sum of prime numbers · Sep 2, 2026
Haha Expert
Maybe I don’t understand something about programming, but the leader in the overall rating spends...
by Haha Expert on Sum of prime numbers · Sep 2, 2026
wn
I have a lot of cool stuff in my code, like loop unrolling, fancy compiler flags, prefetching,...
by wn on Parse integers · Aug 11, 2026
Tony
Oopps sorry I pasted the table, I didn’t realise it would render like this.
by Tony on Parse integers · Aug 10, 2026
Recent Submissions
View all →
C21C21→Largest Square Submatrix of all 1'sCPP
12 hours ago		Error
C21C21→Largest Square Submatrix of all 1'sCPP
12 hours ago		Error
C21C21→Largest Square Submatrix of all 1'sCPP
12 hours ago		Error
C21C21→Blue color from RGBCPP
12 hours ago		Success
C21C21→Parse integersCPP
15 hours ago		Success
Stefan Antoniu OpreaStefan Antoniu Oprea→Unique stringsCPP
15 hours ago		Success
Stefan Antoniu OpreaStefan Antoniu Oprea→Unique stringsCPP
16 hours ago		Success
Stefan Antoniu OpreaStefan Antoniu Oprea→Unique stringsCPP
16 hours ago		Success
Stefan Antoniu OpreaStefan Antoniu Oprea→Unique stringsCPP
16 hours ago		Success
Stefan Antoniu OpreaStefan Antoniu Oprea→Unique stringsCPP
16 hours ago		Error
Recent Solution Challenges
View all →
KacpxerKacpxer-10.00→highload-churner·Parse integers
7 days ago		Solution Held
Andrew EpsteinAndrew Epstein-17.57→Kevin Heavey·Fizz Buzzgen
7 days ago		Solution Held
Andrew EpsteinAndrew Epstein-17.83→Aleksei Shahoika·Fizz Buzzgen
7 days ago		Solution Held
Andrew EpsteinAndrew Epstein-17.82→Dominique Garmier·Fizz Buzzgen
7 days ago		Solution Held
Andrew EpsteinAndrew Epstein-12.87→Charles Cabergs·Fizz Buzzgen
7 days ago		Solution Held
Andrew EpsteinAndrew Epstein-13.52→Aniruddha Deb·Fizz Buzzgen
7 days ago		Solution Held
Andrew EpsteinAndrew Epstein-10.00→Tomislav Tunkovic·Fizz Buzzgen
7 days ago		Solution Held
Andrew EpsteinAndrew Epstein-29.26→janwww·Fizz Buzzgen
7 days ago		Solution Held
Andrew EpsteinAndrew Epstein-10.00→Mark Korneichik·Fizz Buzzgen
7 days ago		Solution Held
Andrew EpsteinAndrew Epstein-10.00→janwww·Blue color from RGBgen
7 days ago		Solution Held