HighLoad Challenges for Fun

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#1
Victor MerckléVictor MerckléGrandmaster
345'165.74 RP
#2
Tomislav TunkovicTomislav TunkovicExpert
115'938.35 RP
#3
Josu San MartinJosu San MartinExpert
105'726.19 RP
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4
marko1597marko1597
Expert91'811.70
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olliecrowolliecrow
Expert90'618.39
6
Yuriy LyfenkoYuriy Lyfenko
Expert85'989.37
7
Andrew TsibinAndrew Tsibin
Expert70'723.05
8
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Expert49'458.64
9
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Skilled41'279.48
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KeefeKeefe
Skilled33'857.11
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zielajzielaj
Skilled32'532.22
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someone12469someone12469
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Apprentice3'997.99
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Apprentice1'700.00
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Expert43'100.00
Master129'400.00
Grandmaster293'300.00
Dynamic · #1 player: 345'165.74 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
wn
I have a lot of cool stuff in my code, like loop unrolling, fancy compiler flags, prefetching,...
by wn on Parse integers · 5 days ago
Tony
Oopps sorry I pasted the table, I didn’t realise it would render like this.
by Tony on Parse integers · 6 days ago
Tony
Your run is # Date Score Wall Time CPU User CPU System Memory Error 1 Jul 7, 2026 05:29 3,292...
by Tony on Parse integers · 6 days ago
wn
“goes through the data is somehow slower.” What are you comparing slower with? My solution?
by wn on Parse integers · 7 days ago
Tony
What I mean is that even this trivial version that does not answer the problem but goes through the...
by Tony on Parse integers · 7 days ago
Recent Submissions
View all →
Tomislav TunkovicTomislav Tunkovic→Unique strings v2ZIG
just now		In queue
Tomislav TunkovicTomislav Tunkovic→Sum of prime numbersCSHARP
2 minutes ago		Testing
marko1597marko1597→Parse dateTimeCPP
9 minutes ago		Success
marko1597marko1597→Parse dateTimeCPP
9 minutes ago		Success
marko1597marko1597→Parse dateTimeCPP
9 minutes ago		Success
marko1597marko1597→Parse dateTimeCPP
19 minutes ago		Success
marko1597marko1597→Parse dateTimeCPP
19 minutes ago		Success
marko1597marko1597→Parse dateTimeCPP
19 minutes ago		Success
Tomislav TunkovicTomislav Tunkovic→Largest Square Submatrix of all 1'sCSHARP
21 minutes ago		Success
Tomislav TunkovicTomislav Tunkovic→Sort UUIDsCPP
24 minutes ago		Success
Recent Solution Challenges
View all →
Kevin HeaveyKevin Heavey→wn·Parse integersgen
24 days ago		Solution Broken
Kevin HeaveyKevin Heavey→wn·Parse integersgen
24 days ago		Solution Broken
Kevin HeaveyKevin Heavey→wn·Parse integersgen
24 days ago		Solution Broken
Kevin HeaveyKevin Heavey→wn·Parse integersgen
24 days ago		Solution Broken
Kevin HeaveyKevin Heavey-10.00→wn·Parse integersgen
Jul 16, 2026		Solution Held
wnwn-10.00→Kevin Heavey·Parse integersgen
Jul 16, 2026		Solution Held
wnwn+9.22→Kevin Heavey-36.89·Parse integersgen
Jul 16, 2026		Solution Broken
Kevin HeaveyKevin Heavey-10.00→wn·Parse integersgen
Jul 15, 2026		Solution Held
Kevin HeaveyKevin Heavey-20.00→wn·Parse integersgen
Jul 15, 2026		Solution Held
wnwn-10.00→Victor Mercklé·Parse integersgen
Jul 10, 2026		Solution Held