HighLoad Challenges for Fun

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#1
Victor MerckléVictor MerckléGrandmaster
115'448.09 RP
#2
Josu San MartinJosu San MartinGrandmaster
107'451.49 RP
#3
olliecrowolliecrowMaster
91'957.48 RP
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Yuriy LyfenkoYuriy Lyfenko
Master89'129.40
5
Dominique GarmierDominique Garmier
Master51'492.02
6
Aniruddha DebAniruddha Deb
Master51'081.39
7
limanjun99limanjun99
Master43'727.99
8
Joad NacerJoad Nacer
Expert41'966.86
9
KeefeKeefe
Expert35'532.15
10
Charles CabergsCharles Cabergs
Expert33'717.77
11
Sergey StreminSergey Stremin
Expert33'427.98
12
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Expert33'028.53
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zielajzielaj
Expert32'546.41
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AlexAlex
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Apprentice500.00
Skilled2'800.00
Expert14'400.00
Master43'200.00
Grandmaster98'100.00
Dynamic · #1 player: 115'448.09 RP
News
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!

2024-11-10

New supported language Zig was added.

2024-08-31

The checker server’s OS has been upgraded to Ubuntu 24.04.

View all news →
Recent Articles
zielaj
Parse integers task: memory access pattern
by zielaj · Apr 23, 2026
7Sergey Svistunov
Using MMAP to optimize data reading
by Sergey Svistunov · Apr 19, 2026
3
Recent Discussions
Sergey Svistunov
I’ve just tuned a little bit the server, MAP_HUGETLB should work now.
by Sergey Svistunov on Using MMAP to optimize data reading · 11 days ago
zielaj
FYI This is a republishing an article that I originally sent to the telegram channel pre-upgrade.
by zielaj on Parse integers task: memory access pattern · 13 days ago
Danylo Mocherniuk
Doesn’t work for me neither.
by Danylo Mocherniuk on Using MMAP to optimize data reading · 13 days ago
zielaj
Does MAP_HUGETLB work for anyone on highload.fun? I remember trying it a long time ago on “Parse...
by zielaj on Using MMAP to optimize data reading · 15 days ago
Recent Submissions
View all →
olliecrowolliecrow→Cross-Margin Liquidation EngineGO
7 minutes ago		Success
olliecrowolliecrow→Parse JSONRUST
1 hour ago		Error
olliecrowolliecrow→Cross-Margin Liquidation EngineZIG
1 hour ago		Success
olliecrowolliecrow→XML to JSONCPP
1 hour ago		Success
olliecrowolliecrow→Large matrix multiplicationCSHARP
2 hours ago		Success
olliecrowolliecrow→Cross-Margin Liquidation EngineRUST
2 hours ago		Success
olliecrowolliecrow→Large matrix multiplicationGO
2 hours ago		Error
olliecrowolliecrow→Cross-Margin Liquidation EngineGO
3 hours ago		Error
olliecrowolliecrow→Cross-Margin Liquidation EngineCSHARP
3 hours ago		Success
olliecrowolliecrow→Cross-Margin Liquidation EngineCSHARP
4 hours ago		Success
Recent Solution Challenges
View all →
Victor MerckléVictor Mercklé+2.41→Dominique Garmier-9.65·Sum of prime numbersgen
4 days ago		Solution Broken
Victor MerckléVictor Mercklé→zielaj·Sum of prime numbersgen
5 days ago		Solution Broken
Victor MerckléVictor Mercklé+1.65→zielaj-6.61·Sum of prime numbersgen
5 days ago		Solution Broken
Victor MerckléVictor Mercklé→zielaj·Sum of prime numbersgen
5 days ago		Solution Broken
Victor MerckléVictor Mercklé-10.00→zielaj·Sum of prime numbers
5 days ago		Solution Held
Yuriy LyfenkoYuriy Lyfenko+6.72→Josu San Martin-26.89·Parse integersgen
6 days ago		Solution Broken
Yuriy LyfenkoYuriy Lyfenko+0.21→wn-0.85·Parse integersgen
6 days ago		Solution Broken
Unays Unays +26.45→Jem Bishop-105.81·Order book
8 days ago		Solution Broken
Unays Unays +29.08→0xZohan-116.33·Order book
8 days ago		Solution Broken
Victor MerckléVictor Mercklé-12.83→zielaj·Largest Square Submatrix of all 1's
8 days ago		Solution Held