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
138'164.94 RP
#2
Josu San MartinJosu San MartinMaster
105'935.69 RP
#3
olliecrowolliecrowMaster
91'704.67 RP
#UserLevelRP
4
Yuriy LyfenkoYuriy Lyfenko
Master88'584.92
5
Dominique GarmierDominique Garmier
Expert51'449.74
6
limanjun99limanjun99
Expert43'657.72
7
Aniruddha DebAniruddha Deb
Expert43'361.46
8
Joad NacerJoad Nacer
Expert41'820.88
9
M-RochatM-Rochat
Expert40'135.63
10
KeefeKeefe
Expert35'247.97
11
zielajzielaj
Expert33'892.81
12
Charles CabergsCharles Cabergs
Expert33'717.77
13
Sergey StreminSergey Stremin
Expert33'423.04
14
Andrey LikhachevAndrey Likhachev
Expert33'012.74
15
Aleksei ShahoikaAleksei Shahoika
Expert30'506.03
16
Robert BurkeRobert Burke
Expert27'360.04
17
matsuoka-601matsuoka-601
Expert26'613.08
18
AnSaAnSa
Expert26'373.35
19
TudyMTudyM
Expert25'025.95
20
gchebanovgchebanov
Expert23'931.76
21
Sergey SerebryakovSergey Serebryakov
Expert22'249.59
22
Ian MckibbenIan Mckibben
Expert21'419.45
23
Bernard TeoBernard Teo
Expert21'256.19
24
Taylor DettlingTaylor Dettling
Expert21'071.61
25
Kenneth MaplesKenneth Maples
Expert20'972.50
26
BenBen
Expert20'726.04
27
Yurkov AlekseyYurkov Aleksey
Expert18'147.30
28
vahookvahook
Skilled17'171.03
29
Mikhail ShirokovMikhail Shirokov
Skilled16'732.03
30
Huy Duc LeHuy Duc Le
Skilled15'457.71
31
HighloadGPT-o3-mini-highHighloadGPT-o3-mini-high
Skilled15'084.38
32
izotoffizotoff
Skilled14'644.90
33
E SequeiraE Sequeira
Skilled13'735.08
34
Oleg KovalovOleg Kovalov
Skilled13'654.57
35
NoSIMD_C#NoSIMD_C#
Skilled13'651.44
36
Daniel MastalerzDaniel Mastalerz
Skilled13'138.37
37
Adam FolwarcznyAdam Folwarczny
Skilled12'440.72
38
Ilya AniskovetsIlya Aniskovets
Skilled12'194.91
39
apuxbtapuxbt
Skilled12'091.48
40
DanielDaniel
Skilled11'762.42
41
lipapipalipapipa
Skilled11'400.41
42
Andrey TsvetkovAndrey Tsvetkov
Skilled11'123.84
43
Elijah KinElijah Kin
Skilled11'100.93
44
Rajarshi BasuRajarshi Basu
Skilled10'656.26
45
Martin StensgårdMartin Stensgård
Skilled10'503.81
46
Yehor BondarYehor Bondar
Skilled10'309.39
47
LiamLiam
Skilled10'153.98
48
etherealethereal
Skilled9'800.25
49
Valentin KofmanValentin Kofman
Skilled8'970.05
50
Chandrasekaran AkashChandrasekaran Akash
Skilled8'886.79
51
HighloadGPTO1HighloadGPTO1
Skilled8'693.37
52
Alexander FrolovAlexander Frolov
Skilled8'537.49
53
Pavel SkripkinPavel Skripkin
Skilled8'324.36
54
wainCGPwainCGP
Skilled7'877.06
55
Eugene ZhydzetskiEugene Zhydzetski
Skilled7'827.98
56
Franek KortaFranek Korta
Skilled7'787.23
57
Hung T.NguyenHung T.Nguyen
Skilled7'731.38
58
Drew GarciaDrew Garcia
Skilled7'523.21
59
Mikołaj UzarskiMikołaj Uzarski
Skilled7'101.62
60
yenw0dyenw0d
Skilled6'893.05
61
Alexander MonakovAlexander Monakov
Skilled6'711.21
62
ii14ii14
Skilled6'424.73
63
Victor MuñozVictor Muñoz
Skilled6'206.20
64
Fernando AntunezFernando Antunez
Skilled6'169.35
65
MylesMyles
Skilled5'914.80
66
Egor SergeevEgor Sergeev
Skilled5'822.74
67
Jasper EdbrookeJasper Edbrooke
Skilled5'747.80
68
parsersmailparsersmail
Skilled5'556.90
69
Matt StuchlikMatt Stuchlik
Skilled5'422.27
70
Alex KentAlex Kent
Skilled5'350.17
71
Alexander KimAlexander Kim
Skilled5'267.02
72
HattonuriHattonuri
Skilled5'224.59
73
Jack FrigaardJack Frigaard
Skilled5'000.09
74
IhebIheb
Skilled4'935.29
75
Tejas G.Tejas G.
Skilled4'868.71
76
AndreiAndrei
Skilled4'778.86
77
Mikhail DektyarevMikhail Dektyarev
Skilled4'730.65
78
someone12469someone12469
Skilled4'694.19
79
Jacob McDanielJacob McDaniel
Skilled4'609.87
80
caandocaando
Skilled4'473.16
81
T PrathamT Pratham
Skilled4'458.16
82
Bohdan StorozhukBohdan Storozhuk
Skilled4'349.10
83
Maya RebholzMaya Rebholz
Skilled4'284.31
84
thatmagicalcatthatmagicalcat
Skilled4'273.95
85
Jatin YadavJatin Yadav
Skilled4'202.00
86
piculpicul
Skilled4'156.87
87
MatthiasMatthias
Skilled3'996.99
88
Vitaliy F.Vitaliy F.
Skilled3'865.85
89
Hal FHal F
Skilled3'863.14
90
Leon ZhaoLeon Zhao
Skilled3'795.52
91
Oleg SkinderevOleg Skinderev
Skilled3'772.41
92
CadovvlCadovvl
Skilled3'771.94
93
Ryan Chung Yi ShengRyan Chung Yi Sheng
Skilled3'769.39
94
A L ManningA L Manning
Skilled3'697.07
95
Cameron AavikCameron Aavik
Skilled3'589.58
96
mmalczakmmalczak
Skilled3'557.22
97
sheryllynn24sheryllynn24
Skilled3'540.32
98
Jem BishopJem Bishop
Skilled3'537.58
99
BenBen
Skilled3'534.34
100
Hayden DonnellyHayden Donnelly
Skilled3'476.49
View all users →
Level Thresholds
Apprentice600.00
Skilled3'400.00
Expert17'200.00
Master51'800.00
Grandmaster117'400.00
Dynamic · #1 player: 138'164.94 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 · Apr 24, 2026
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 · Apr 23, 2026
Danylo Mocherniuk
Doesn’t work for me neither.
by Danylo Mocherniuk on Using MMAP to optimize data reading · Apr 23, 2026
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 · Apr 21, 2026
Recent Submissions
View all →
Elijah KinElijah Kin→Large integer multiplicationCPP
6 minutes ago		Success
Victor MerckléVictor Mercklé→Blue color from RGBACPP
6 minutes ago		Success
Victor MerckléVictor Mercklé→Blue color from RGBACPP
11 minutes ago		Success
Elijah KinElijah Kin→Large integer multiplicationCPP
14 minutes ago		Success
Victor MerckléVictor Mercklé→Blue color from RGBACPP
21 minutes ago		Success
Elijah KinElijah Kin→Large integer multiplicationCPP
23 minutes ago		Success
Elijah KinElijah Kin→Large integer multiplicationCPP
28 minutes ago		Success
Victor MerckléVictor Mercklé→Blue color from RGBCPP
39 minutes ago		Success
Elijah KinElijah Kin→Large integer multiplicationCPP
42 minutes ago		Success
Victor MerckléVictor Mercklé→Blue color from RGBCPP
44 minutes ago		Success
Recent Solution Challenges
View all →
Josu San MartinJosu San Martin-21.44→Dmtry·Order book
4 days ago		Solution Held
Josu San MartinJosu San Martin-10.00→Dmtry·Order book
4 days ago		Solution Held
Josu San MartinJosu San Martin+41.84→Jem Bishop-167.36·Order book
4 days ago		Solution Broken
Josu San MartinJosu San Martin+45.62→Jem Bishop-182.49·Order book
5 days ago		Solution Broken
Josu San MartinJosu San Martin+485.52→Aniruddha Deb-1'942.08·Order book
5 days ago		Solution Broken
Josu San MartinJosu San Martin+5.94→Jem Bishop-23.74·Order book
5 days ago		Solution Broken
Josu San MartinJosu San Martin+11.02→Jem Bishop-44.07·Order book
5 days ago		Solution Broken
Josu San MartinJosu San Martin+101.95→Aniruddha Deb-407.79·Order book
5 days ago		Solution Broken
Victor MerckléVictor Mercklé+1.16→limanjun99-4.65·Parse integersgen
11 days ago		Solution Broken
Victor MerckléVictor Mercklé-10.00→limanjun99·Parse integers
14 days ago		Solution Held