HighLoad Challenges for Fun

Join a global community of top software engineers, sharpen your skills, and write the fastest code. The challenge awaits you!

Code
Compete
Climb
Join the CommunityBrowse Challenges
Leaderboard
#1
Victor MerckléVictor MerckléGrandmaster
249'344.23 RP
#2
Tomislav TunkovicTomislav TunkovicMaster
206'351.01 RP
#3
marko1597marko1597Expert
71'001.76 RP
#UserLevelRP
4
olliecrowolliecrow
Expert69'198.60
5
Josu San MartinJosu San Martin
Expert66'449.87
6
Andrew EpsteinAndrew Epstein
Expert65'900.51
7
Yuriy LyfenkoYuriy Lyfenko
Expert59'171.33
8
Andrew TsibinAndrew Tsibin
Expert56'520.72
9
Dominique GarmierDominique Garmier
Expert46'106.63
10
Joad NacerJoad Nacer
Expert39'711.14
11
Aniruddha DebAniruddha Deb
Expert34'369.30
12
limanjun99limanjun99
Expert32'433.06
13
M-RochatM-Rochat
Expert32'189.68
14
KeefeKeefe
Skilled30'456.89
15
Aleksei ShahoikaAleksei Shahoika
Skilled29'529.29
16
C#_userC#_user
Skilled27'906.94
17
Robert BurkeRobert Burke
Skilled27'360.04
18
Charles CabergsCharles Cabergs
Skilled27'176.08
19
matsuoka-601matsuoka-601
Skilled26'483.79
20
AnSaAnSa
Skilled25'989.47
21
Sergey StreminSergey Stremin
Skilled25'339.63
22
zielajzielaj
Skilled24'389.14
23
gchebanovgchebanov
Skilled23'931.76
24
TudyMTudyM
Skilled23'119.76
25
Bernard TeoBernard Teo
Skilled22'602.81
26
A_ShamanA_Shaman
Skilled22'125.45
27
Andrey LikhachevAndrey Likhachev
Skilled21'205.42
28
Kenneth MaplesKenneth Maples
Skilled20'972.50
29
Ian MckibbenIan Mckibben
Skilled20'744.06
30
Taylor DettlingTaylor Dettling
Skilled20'737.27
31
BenBen
Skilled20'733.04
32
Yurkov AlekseyYurkov Aleksey
Skilled18'639.59
33
Shikhar SoniShikhar Soni
Skilled18'071.79
34
Sergey SerebryakovSergey Serebryakov
Skilled17'158.19
35
Mikhail ShirokovMikhail Shirokov
Skilled16'732.03
36
Elijah KinElijah Kin
Skilled16'081.10
37
Huy Duc LeHuy Duc Le
Skilled15'457.71
38
HighloadGPT-o3-mini-highHighloadGPT-o3-mini-high
Skilled15'042.60
39
Yehor BondarYehor Bondar
Skilled14'063.30
40
Oleg KovalovOleg Kovalov
Skilled13'796.45
41
izotoffizotoff
Skilled13'703.60
42
Adam FolwarcznyAdam Folwarczny
Skilled12'988.27
43
E SequeiraE Sequeira
Skilled12'288.85
44
Ilya AniskovetsIlya Aniskovets
Skilled12'195.91
45
apuxbtapuxbt
Skilled12'091.48
46
vahookvahook
Skilled11'567.55
47
Daniel MastalerzDaniel Mastalerz
Skilled11'249.57
48
Maksim ShcherboMaksim Shcherbo
Skilled11'086.96
49
Kevin HeaveyKevin Heavey
Skilled10'658.02
50
Andrey TsvetkovAndrey Tsvetkov
Skilled10'565.30
51
Martin StensgårdMartin Stensgård
Skilled10'503.81
52
DanielDaniel
Skilled10'420.84
53
LiamLiam
Skilled10'153.98
54
Georgios KonstantopoulosGeorgios Konstantopoulos
Skilled9'847.34
55
etherealethereal
Skilled9'727.27
56
Rajarshi BasuRajarshi Basu
Skilled9'709.20
57
lipapipalipapipa
Skilled9'364.21
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
Pavel SkripkinPavel Skripkin
Skilled8'324.36
63
TonyTony
Skilled8'179.42
64
wainCGPwainCGP
Skilled7'877.06
65
Franek KortaFranek Korta
Skilled7'787.22
66
Hung T.NguyenHung T.Nguyen
Skilled7'731.38
67
Drew GarciaDrew Garcia
Skilled7'523.21
68
Maya RebholzMaya Rebholz
Skilled7'002.34
69
Mikołaj UzarskiMikołaj Uzarski
Skilled6'986.70
70
Teow Hua JunTeow Hua Jun
Skilled6'716.71
71
Alexander MonakovAlexander Monakov
Skilled6'711.21
72
Eugene ZhydzetskiEugene Zhydzetski
Skilled6'461.31
73
ii14ii14
Skilled6'424.73
74
Fernando AntunezFernando Antunez
Skilled6'296.01
75
Victor MuñozVictor Muñoz
Skilled6'206.20
76
flavio87flavio87
Apprentice5'900.29
77
Egor SergeevEgor Sergeev
Apprentice5'822.74
78
Navneet RajNavneet Raj
Apprentice5'763.36
79
Jasper EdbrookeJasper Edbrooke
Apprentice5'748.80
80
MylesMyles
Apprentice5'654.89
81
parsersmailparsersmail
Apprentice5'556.90
82
Alexander KimAlexander Kim
Apprentice5'267.02
83
HattonuriHattonuri
Apprentice4'964.02
84
Jack FrigaardJack Frigaard
Apprentice4'949.69
85
IhebIheb
Apprentice4'904.27
86
Tejas G.Tejas G.
Apprentice4'868.71
87
highloadLLMhighloadLLM
Apprentice4'784.67
88
AndreiAndrei
Apprentice4'778.86
89
Mikhail DektyarevMikhail Dektyarev
Apprentice4'730.65
90
someone12469someone12469
Apprentice4'694.19
91
Jacob McDanielJacob McDaniel
Apprentice4'612.87
92
T PrathamT Pratham
Apprentice4'458.16
93
caandocaando
Apprentice4'410.33
94
Bohdan StorozhukBohdan Storozhuk
Apprentice4'349.10
95
thatmagicalcatthatmagicalcat
Apprentice4'273.95
96
Matt StuchlikMatt Stuchlik
Apprentice4'209.16
97
Jatin YadavJatin Yadav
Apprentice4'202.00
98
piculpicul
Apprentice4'156.87
99
f0xerif0xeri
Apprentice4'142.99
100
Ryan Chung Yi ShengRyan Chung Yi Sheng
Apprentice4'136.36
View all users →
Level Thresholds
Apprentice1'200.00
Skilled6'200.00
Expert31'100.00
Master93'500.00
Grandmaster211'900.00
Dynamic · #1 player: 249'344.23 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
C#_user
Victor Mercklé→Sum of prime numbersCPP 8 minutes ago Success Victor Mercklé→Format...
by C#_user on Sum of prime numbers · 10 days ago
C#_user
Victor Mercklé PhD Student in Machine Learning - and my previous remarks are already starting to...
by C#_user on Sum of prime numbers · 10 days ago
C#_user
Maybe I don’t understand something about programming, but the leader in the overall rating spends...
by C#_user on Sum of prime numbers · 10 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 · 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 →
Kevin HeaveyKevin Heavey→Count uint8CPP
8 hours ago		Success
Kevin HeaveyKevin Heavey→Count uint8CPP
8 hours ago		Success
Kevin HeaveyKevin Heavey→Count uint8CPP
8 hours ago		Success
Kevin HeaveyKevin Heavey→Count uint8CPP
8 hours ago		Success
SparkyRobinSparkyRobin→MedianCPP
9 hours ago		Success
SparkyRobinSparkyRobin→MedianCPP
9 hours ago		Success
Kevin HeaveyKevin Heavey→Count uint8CPP
9 hours ago		Success
Kevin HeaveyKevin Heavey→Count uint8CPP
9 hours ago		Success
Kevin HeaveyKevin Heavey→Count uint8CPP
9 hours ago		Success
Kevin HeaveyKevin Heavey→Count uint8CPP
9 hours ago		Success
Recent Solution Challenges
View all →
C#_userC#_user-10.00→Andrew Epstein·Order bookgen
10 hours ago		Solution Held
Andrew EpsteinAndrew Epstein-13.34→marko1597·Parse dateTimegen
1 day ago		Solution Held
Andrew EpsteinAndrew Epstein-11.83→Tomislav Tunkovic·Parse dateTimegen
1 day ago		Solution Held
Andrew EpsteinAndrew Epstein-10.00→Victor Mercklé·Parse dateTimegen
1 day ago		Solution Held
Andrew EpsteinAndrew Epstein-10.00→Tomislav Tunkovic·Parse dateTimegen
1 day ago		Solution Held
Andrew EpsteinAndrew Epstein+24.02→Dominique Garmier-96.08·Arithmetic expressionsgen
1 day ago		Solution Broken
Andrew EpsteinAndrew Epstein-10.82→C#_user·Arithmetic expressionsgen
1 day ago		Solution Held
Andrew EpsteinAndrew Epstein-12.64→Victor Mercklé·Arithmetic expressionsgen
1 day ago		Solution Held
Andrew EpsteinAndrew Epstein+13.93→Dominique Garmier-55.72·Cross-Margin Liquidation Enginegen
1 day ago		Solution Broken
Andrew EpsteinAndrew Epstein+45.05→Yuriy Lyfenko-180.19·Cross-Margin Liquidation Enginegen
1 day ago		Solution Broken