$30 off During Our Annual Pro Sale. View Details »
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Rustで始める競技プログラミング
Search
minami
September 17, 2019
Programming
0
330
Rustで始める競技プログラミング
Rustで始める競技プログラミング
minami
September 17, 2019
Tweet
Share
More Decks by minami
See All by minami
Autocxx -RustからC++を安全かつ楽に-
minaminao
2
1.4k
Account/Balanceモデルのシャーディングと課題点
minaminao
1
770
Other Decks in Programming
See All in Programming
CloudNative Days Winter 2025: 一週間で作る低レイヤコンテナランタイム
ternbusty
7
1.9k
ZOZOにおけるAI活用の現在 ~モバイルアプリ開発でのAI活用状況と事例~
zozotech
PRO
8
3.9k
Micro Frontendsで築いた 共通基盤と運用の試行錯誤 / Building a Shared Platform with Micro Frontends: Operational Learnings
kyntk
1
1.9k
AIエージェントでのJava開発がはかどるMCPをAIを使って開発してみた / java mcp for jjug
kishida
5
850
WebRTC、 綺麗に見るか滑らかに見るか
sublimer
1
110
配送計画の均等化機能を提供する取り組みについて(⽩⾦鉱業 Meetup Vol.21@六本⽊(数理最適化編))
izu_nori
0
120
Socio-Technical Evolution: Growing an Architecture and Its Organization for Fast Flow
cer
PRO
0
200
堅牢なフロントエンドテスト基盤を構築するために行った取り組み
shogo4131
4
1.8k
CSC509 Lecture 14
javiergs
PRO
0
210
Media Capture and Streams: W3C仕様と現場での知見
nowaki28
0
120
俺流レスポンシブコーディング 2025
tak_dcxi
13
7k
ID管理機能開発の裏側 高速にSaaS連携を実現したチームのAI活用編
atzzcokek
0
160
Featured
See All Featured
How To Stay Up To Date on Web Technology
chriscoyier
791
250k
GitHub's CSS Performance
jonrohan
1032
470k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
12
1.3k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
4.1k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
31
2.7k
Practical Tips for Bootstrapping Information Extraction Pipelines
honnibal
25
1.6k
Principles of Awesome APIs and How to Build Them.
keavy
127
17k
Code Review Best Practice
trishagee
73
19k
RailsConf 2023
tenderlove
30
1.3k
Keith and Marios Guide to Fast Websites
keithpitt
413
23k
Balancing Empowerment & Direction
lara
5
780
Facilitating Awesome Meetings
lara
57
6.6k
Transcript
3VTUͰ࢝ΊΔ ڝٕϓϩάϥϛϯά NJOBNJOBP SPQQPOHJST
Ԭೆ࠸ NJOBNJOBP !WJOBNJ ࣗݾհ ஜେֶใֶ܈ใՊֶྨ d-BZFS93%νʔϜ
ڝϓϩͱ ಘΒΕΔͷ ࣍ ·ͱΊ
ڝٕϓϩάϥϛϯάͱ ͕༩͑ΒΕΔ ɾ࣮ߦ࣌ؒͱϝϞϦ༻ྔͷ্ݶ͖ ͦΕΛղ͘ϓϩάϥϜΛ࣮ˍఏग़ αʔόʔ͕ਖ਼ղ͔ఆ ղ͚͕ͨଟ͍ํ͕উͪ
ڝϓϩͰಘΒΕΔͷ ɾϓϩάϥϛϯάݴޠͷࣝͱ࣮ྗ ɾղܾྗɺཧతࢥߟྗɺֶྗ ɾߴͳϓϩάϥϜͷ࣮ํ๏ ΞϧΰϦζϜͱσʔλߏ
ΞϧΰϦζϜͱσʔλߏ ߹ֶͤɺแআݪཧɺׂɺηάϝϯτπϦʔɺฏํׂɺώʔϓɺ#JOBSZ *OEFYFE5SFFɺฏߧೋ୳ࡧɺ࠲ඪѹॖɺLEɺ6OJPO'JOEɺಈత࠷దԽɺήʔ Ϝཧɺ࠷૿Ճ෦ྻɺ८ճηʔϧεϚϯɺ࠷খแؚٿɺزԿɺ࠷খॏΈࡾ֯ ܗׂɺάϥϑཧɺ࠷ܦ࿏ɺɺ-PXFTU$PNNPO"ODFTUPSɺϚονϯάɺ ด࿏ݕग़ɺ࠼৭ɺ-PXMJOLɺ࠷খશҬɺτϙϩδΧϧιʔτɺڧ࿈݁ղɺ ᩦཉ๏ɺઢܗɺΨεͷফڈ๏ɺɺೋ߲ɺ($%-$.ɺૉҼղɺ ղੳɺೋ๏ɺϥάϥϯδϡิؒɺιʔτɺసɺ.BOBDIFSɺ.PSSJTr1SBUUɺ ϩʔϦϯάϋογϡɺ4V⒏Y"SSBZɺ;"MHPSJUINɺ͠Ό͘ͱΓ๏ɺ ͜ΕΒ
Ұྫ Λཧղˍ͑ΔΑ͏ʹͳΔ
ૣͬͯΈΔ 3VTUͰʂ
"#$"1SPEVDU IUUQTBUDPEFSKQDPOUFTUTBCDUBTLTBCD@B
"#$"1SPEVDU wਖ਼B C͕ඪ४ೖྗ͔Β༩͑ΒΕΔ wۭന۠Γ wB C͕ۮͳΒ&WFOΛحͳΒ0EEΛग़ྗ wB C ֓ཁ
wඪ४ೖྗΛ͏VTFTUEJP wۮ͔Ͳ͏͔JG B C ϙΠϯτ "#$"1SPEVDU w
IUUQTBUDPEFSKQDPOUFTUTBCDTVCNJTTJPOT ղྫ
"#$"1SPEVDUղྫ
"#$"1SPEVDUղྫ ೖྗΛָʹ͍ͨ͠ʂ
ۭനɾվߦ͝ͱʹೖྗΛಘΔؔ
ۭനɾվߦ͝ͱʹೖྗΛಘΔؔ w 3VTUͰڝٕϓϩάϥϛϯάͷೖྗΛεοΩϦهड़͢ΔϚΫϩ2JJUB CZͨͳ͜;͞Μ w IUUQTRJJUBDPNUBOBLIJUFNTCBDDBDEEBD ߋʹߴػೳͳೖྗิॿ Θ͔Γ͍͢
"#$"1BSLJOH IUUQTBUDPEFSKQDPOUFTUTBCDUBTLTBCD@B
"#$"1SPEVDU wறंͷྉۚϓϥϯ͕छྨ wϓϥϯ5࣌ؒͰ" 5ԁ wϓϥϯ#ԁݻఆ wਖ਼/ " #͕༩͑ΒΕΔ w/࣌ؒறं͢Δͱ͖ͷ࠷҆ͷஈʁ
֓ཁ
wNJOؔVTFTUEDNQNJO wNJO B C ϙΠϯτ "#$"1SPEVDU
දతίϯςεταΠτ AtCoder Codeforces Google Code Jam ։࠵ස 1,2ճ/ि 6ճ͘Β͍/݄ 1ճ/
ࢀՃਓ/ճ 5000ਓ 10000ਓ 35000ਓ ։࠵ࠃ ຊ ϩγΞ - จ ຊޠ / ӳޠ ӳޠ ӳޠ Rust version 1.15.1 1.35.0 ະରԠ
Ϩϕϧ 100 ࢛ଇԋࢉ, จࣈྻૢ࡞ 200 ݅ذ, ϧʔϓ 300
ιʔτͳͲͷΞϧΰϦζϜͷ͕ࣝඞཁʹ 400 ~ ܭࢉྔͷݟੵΓ͕ඞཁʹ 2000Ҏ্ͷ
"#$# IUUQTBUDPEFSKQDPOUFTUTBCDUBTLTBCD@C
"#$# wਖ਼B C͕ඪ४ೖྗ͔Β༩͑ΒΕΔ wۭന۠Γ wBͱCΛจࣈྻͱͯ͠ܨ͛ͨͱ͖ฏํ͔ʁ wྫlz? wฏํͳΒ:FTɺͦ͏Ͱͳ͍ͳΒ/PΛग़ྗ wB C
֓ཁ
wจࣈྻ݁߹GPSNBU l\^\^z B C w4USJOHUPJTJ[FTQBSTFJTJ[F VOXSBQ ϙΠϯτ "#$#
w YBͱCΛ݁߹ͨ͠ w JdY·ͰJ JYΛຬͨ͢ͷ͕ଘࡏ͢Δ͔ௐΔ w ଘࡏ͢ΔͳΒYฏํ ղྫ
"#$#ղྫ ͜ͷղ๏ͷܭࢉྔ0 Y ߋʹྑ͍ղ๏ ɾJd㲋YͰ୳ࡧ0 㲋Y ɾJʹ͍ͭͯೋ୳ࡧ0 MPHY
ܭࢉྔ ྫ 1ඵҎͰ O(1) ࢛ଇԋࢉͳͲ - O(n) n=10^8·Ͱ O(n^2) n=10^4·Ͱ
O(log n) ೋ୳ࡧͳͲ ͨ͘͞Μ O(n log n) ιʔτͳͲ n=10^5·Ͱ ܭࢉྔ w0 O Oճܭࢉ͢ΔͳΒ0 O wఆഒແࢹOճܭࢉ͢Δͱͯ͠0 O #JH0ه๏
"#$#7BSJFE IUUQTBUDPEFSKQDPOUFTUTBCDUBTLTBCD@C
"#$#7BSJFE wӳখจࣈ͔ΒͳΔจࣈྻ4͕༩͑ΒΕΔ w4ʹؚ·ΕΔจࣈ͕શͯҟͳΔ͔Ͳ͏͔ wҟͳΔͳΒZFTɺͦ͏Ͱͳ͍ͳΒOPΛग़ྗ w4ͷ͞ ֓ཁ
"#$#7BSJFEղྫ w4USJOHT<J>ͷΑ͏ʹจࣈͷऔಘ͕Ͱ͖ͳ͍ w4USJOH͔Β7FDDIBSʹม͢Δ ϙΠϯτ
"#$$1SJTPO IUUQTBUDPEFSKQDPOUFTUTBCDUBTLTBCD@D
"#$$1SJTPO w/ຕͷ*%Χʔυ .ຕͷήʔτ wήʔτ*%ΧʔυͰ௨ΕΔ wJ൪ͷήʔτ-@Jd3@J൪ͷ*%ΧʔυͰ௨ΕΔ wͲΕ͔͍ͭ࣋ͬͯΕ͍͍ wຕ͚ͩͰશήʔτΛ௨աͰ͖Δ*%ΧʔυԿຕ͔ w/? .?
w-@J3@J/ ֓ཁ
4BNQMF ID1 ID2 ID3 ID4 G1 G2 /. -@ 3@
-@ 3@ ൪ͱ൪ͷ*%Χʔυ͕શήʔτΛ௨ΕΔ
4BNQMF ID1 2 3 4 5 6 7 8 9
10 G1 G2 G3 ൪ͷ*%ΧʔυͷΈશήʔτΛ௨ΕΔ
"#$$1SJTPOղྫ
"#$$0UPTIJEBNB IUUQTBUDPEFSKQDPOUFTUTBCDUBTLTBCD@D
"#$$0UPTIJEBNB wԁࡳɺԁࡳɺԁࡳ͕ແݶʹ͋Δ w͓ࡳ͕/ຕɺ߹ܭ:ԁ wԁࡳYຕɺԁࡳZຕɺԁࡳ[ຕͱ͢Δ w༗ΓಘΔຕͷ߹ͤͭΛग़ྗ w:ԁͳΒɺ Y Z [
ͳͲ ֓ཁ
5-&ղ
5-&ղ0 O? O? ?ؒʹ߹Θͳ͍
"$ղ0 O?
·ͱΊ
·ͱΊ wѹతΞτϓοτ͕Ͱ͖Δ wܭࢉྔ͕ݟੵΕΔΑ͏ʹͳΔ wΞϧΰϦζϜͱσʔλߏʹৄ͘͠ͳΕΔ w࣮ྗ͕ఆྔԽ͞ΕΔ wԿΑΓָ͍͠ w࣮ߦʹ͔͔Δॲཧ͕ඵͰͰ͖ͨΓ wʹʹίʔσΟϯάεϐʔυ͕͘ͳͬͨΓ
͓·͚ʢPKʹΑΔࣗಈఏग़ʣ IUUQTHJUIVCDPNNJOBNJOBPBUDPEFSSVTUCMPCNBTUFSWTDPEFUBTLTKTPO IUUQTHJUIVCDPNLNZLPOMJOFKVEHFUPPMT