HighLoad Challenges for Fun

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#1
Victor MerckléVictor MerckléGrandmaster
254'433.87 RP
#2
Tomislav TunkovicTomislav TunkovicMaster
205'075.98 RP
#3
Josu San MartinJosu San MartinExpert
94'120.33 RP
#UserLevelRP
4
olliecrowolliecrow
Expert87'055.40
5
marko1597marko1597
Expert74'317.81
6
Yuriy LyfenkoYuriy Lyfenko
Expert70'161.64
7
Andrew TsibinAndrew Tsibin
Expert65'036.85
8
Dominique GarmierDominique Garmier
Expert48'444.23
9
Andrew EpsteinAndrew Epstein
Expert45'059.20
10
Joad NacerJoad Nacer
Expert40'182.74
11
Aniruddha DebAniruddha Deb
Expert36'013.78
12
M-RochatM-Rochat
Expert35'637.79
13
limanjun99limanjun99
Expert35'116.38
14
KeefeKeefe
Expert32'506.23
15
Charles CabergsCharles Cabergs
Skilled31'391.72
16
Aleksei ShahoikaAleksei Shahoika
Skilled30'106.12
17
Sergey StreminSergey Stremin
Skilled28'863.04
18
zielajzielaj
Skilled28'809.11
19
Robert BurkeRobert Burke
Skilled27'360.04
20
matsuoka-601matsuoka-601
Skilled26'482.79
21
AnSaAnSa
Skilled25'989.47
22
TudyMTudyM
Skilled25'025.95
23
Andrey LikhachevAndrey Likhachev
Skilled24'632.34
24
A_ShamanA_Shaman
Skilled23'960.03
25
gchebanovgchebanov
Skilled23'931.76
26
Bernard TeoBernard Teo
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27
Ian MckibbenIan Mckibben
Skilled21'419.45
28
Sergey SerebryakovSergey Serebryakov
Skilled21'225.71
29
Taylor DettlingTaylor Dettling
Skilled21'071.61
30
Kenneth MaplesKenneth Maples
Skilled20'972.50
31
BenBen
Skilled20'733.04
32
Yurkov AlekseyYurkov Aleksey
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33
Shikhar SoniShikhar Soni
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34
Mikhail ShirokovMikhail Shirokov
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35
Elijah KinElijah Kin
Skilled16'081.10
36
Huy Duc LeHuy Duc Le
Skilled15'457.71
37
HighloadGPT-o3-mini-highHighloadGPT-o3-mini-high
Skilled15'084.38
38
vahookvahook
Skilled14'823.58
39
izotoffizotoff
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40
Yehor BondarYehor Bondar
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41
Oleg KovalovOleg Kovalov
Skilled13'796.45
42
E SequeiraE Sequeira
Skilled13'449.97
43
Adam FolwarcznyAdam Folwarczny
Skilled12'988.27
44
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Skilled12'195.91
45
apuxbtapuxbt
Skilled12'091.48
46
DanielDaniel
Skilled11'994.16
47
Daniel MastalerzDaniel Mastalerz
Skilled11'420.70
48
Andrey TsvetkovAndrey Tsvetkov
Skilled11'187.83
49
Maksim ShcherboMaksim Shcherbo
Skilled11'084.96
50
Kevin HeaveyKevin Heavey
Skilled10'657.02
51
Martin StensgårdMartin Stensgård
Skilled10'503.81
52
LiamLiam
Skilled10'153.98
53
Georgios KonstantopoulosGeorgios Konstantopoulos
Skilled9'847.34
54
etherealethereal
Skilled9'800.25
55
NoSIMD_C#NoSIMD_C#
Skilled9'756.13
56
Rajarshi BasuRajarshi Basu
Skilled9'709.20
57
lipapipalipapipa
Skilled9'490.01
58
Valentin KofmanValentin Kofman
Skilled8'970.05
59
Chandrasekaran AkashChandrasekaran Akash
Skilled8'887.79
60
HighloadGPTO1HighloadGPTO1
Skilled8'693.37
61
Alexander FrolovAlexander Frolov
Skilled8'537.49
62
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Skilled8'324.36
63
TonyTony
Skilled8'178.42
64
wainCGPwainCGP
Skilled7'877.06
65
Eugene ZhydzetskiEugene Zhydzetski
Skilled7'791.56
66
Franek KortaFranek Korta
Skilled7'787.23
67
Hung T.NguyenHung T.Nguyen
Skilled7'731.38
68
Drew GarciaDrew Garcia
Skilled7'523.21
69
Maya RebholzMaya Rebholz
Skilled7'002.34
70
Mikołaj UzarskiMikołaj Uzarski
Skilled6'986.70
71
Teow Hua JunTeow Hua Jun
Skilled6'716.71
72
Alexander MonakovAlexander Monakov
Skilled6'711.21
73
ii14ii14
Skilled6'424.73
74
Fernando AntunezFernando Antunez
Apprentice6'296.01
75
Victor MuñozVictor Muñoz
Apprentice6'206.20
76
MylesMyles
Apprentice5'900.86
77
flavio87flavio87
Apprentice5'897.29
78
yenw0dyenw0d
Apprentice5'895.04
79
Egor SergeevEgor Sergeev
Apprentice5'822.74
80
Navneet RajNavneet Raj
Apprentice5'763.36
81
Jasper EdbrookeJasper Edbrooke
Apprentice5'748.80
82
parsersmailparsersmail
Apprentice5'556.90
83
Matt StuchlikMatt Stuchlik
Apprentice5'425.27
84
Alex KentAlex Kent
Apprentice5'351.17
85
Alexander KimAlexander Kim
Apprentice5'267.02
86
highloadLLMhighloadLLM
Apprentice5'220.83
87
HattonuriHattonuri
Apprentice5'110.60
88
Jack FrigaardJack Frigaard
Apprentice4'949.69
89
IhebIheb
Apprentice4'935.29
90
Zhou180Zhou180
Apprentice4'923.21
91
Tejas G.Tejas G.
Apprentice4'868.71
92
AndreiAndrei
Apprentice4'778.86
93
Mikhail DektyarevMikhail Dektyarev
Apprentice4'730.65
94
someone12469someone12469
Apprentice4'694.19
95
Jacob McDanielJacob McDaniel
Apprentice4'612.87
96
T PrathamT Pratham
Apprentice4'458.16
97
caandocaando
Apprentice4'446.82
98
Bohdan StorozhukBohdan Storozhuk
Apprentice4'349.10
99
thatmagicalcatthatmagicalcat
Apprentice4'273.95
100
Jatin YadavJatin Yadav
Apprentice4'202.00
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Level Thresholds
Apprentice1'200.00
Skilled6'300.00
Expert31'800.00
Master95'400.00
Grandmaster216'200.00
Dynamic · #1 player: 254'433.87 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
NoSIMD_C#
Victor Mercklé→Sum of prime numbersCPP 8 minutes ago Success Victor Mercklé→Format...
by NoSIMD_C# on Sum of prime numbers · 4 days ago
NoSIMD_C#
Victor Mercklé PhD Student in Machine Learning - and my previous remarks are already starting to...
by NoSIMD_C# on Sum of prime numbers · 4 days ago
NoSIMD_C#
Maybe I don’t understand something about programming, but the leader in the overall rating spends...
by NoSIMD_C# on Sum of prime numbers · 4 days ago
wn
I have a lot of cool stuff in my code, like loop unrolling, fancy compiler flags, prefetching,...
by wn on Parse integers · 26 days ago
Tony
Oopps sorry I pasted the table, I didn’t realise it would render like this.
by Tony on Parse integers · 27 days ago
Recent Submissions
View all →
Warren FuWarren Fu→Count uint8CPP
6 hours ago		Success
Victor MerckléVictor Mercklé→Cross-Margin Liquidation EngineCPP
11 hours ago		Success
NoSIMD_C#NoSIMD_C#→Format integersCSHARP
12 hours ago		Success
Kevin HeaveyKevin Heavey→Parse integersCSHARP
12 hours ago		Success
Kevin HeaveyKevin Heavey→Parse integersCSHARP
12 hours ago		Success
big blenderbig blender→TopKCPP
13 hours ago		Success
Victor MerckléVictor Mercklé→Sort UUIDsCPP
13 hours ago		Success
Kevin HeaveyKevin Heavey→Parse integersCSHARP
13 hours ago		Success
big blenderbig blender→TopKCPP
13 hours ago		Success
Kevin HeaveyKevin Heavey→Parse integersCSHARP
13 hours ago		Success
Recent Solution Challenges
View all →
Andrew AshworthAndrew Ashworth-10.00→Kevin Heavey·Parse integersgen
1 hour ago		Solution Held
NoSIMD_C#NoSIMD_C#-10.04→Victor Mercklé·Largest Square Submatrix of all 1'sgen
1 day ago		Solution Held
Victor MerckléVictor Mercklé-10.00→Tomislav Tunkovic·Sum of prime numbersgen
1 day ago		Solution Held
Victor MerckléVictor Mercklé-10.00→Tomislav Tunkovic·Sum of prime numbersgen
1 day ago		Solution Held
Victor MerckléVictor Mercklé-10.00→Tomislav Tunkovic·Sum of prime numbersgen
1 day ago		Solution Held
Victor MerckléVictor Mercklé-10.00→Tomislav Tunkovic·Sum of prime numbersgen
1 day ago		Solution Held
NoSIMD_C#NoSIMD_C#→zielaj·Largest Square Submatrix of all 1'sgen
1 day ago		Solution Broken
NoSIMD_C#NoSIMD_C#→zielaj·Largest Square Submatrix of all 1'sgen
1 day ago		Solution Broken
NoSIMD_C#NoSIMD_C#→E Sequeira·Largest Square Submatrix of all 1'sgen
1 day ago		Solution Broken
NoSIMD_C#NoSIMD_C#→Aleksei Shahoika·Largest Square Submatrix of all 1'sgen
1 day ago		Solution Broken