Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Quick Sort

Avatar for KuoE0 KuoE0
March 15, 2013
Programming
5
10k

Quick Sort

Avatar for KuoE0

KuoE0

March 15, 2013
Tweet

More Decks by KuoE0

See All by KuoE0
Protocol handler in Gecko
Avatar for KuoE0 kuoe0
0
96
面試面試面試，因為很重要所以要說三次！
Avatar for KuoE0 kuoe0
2
240
應徵軟體工程師
Avatar for KuoE0 kuoe0
0
160
面試心得分享
Avatar for KuoE0 kuoe0
0
410
Windows 真的不好用...
Avatar for KuoE0 kuoe0
0
280
Python @Wheel Lab
Avatar for KuoE0 kuoe0
0
200
Introduction to VP8
Avatar for KuoE0 kuoe0
0
240
Python @NCKU_CSIE
Avatar for KuoE0 kuoe0
0
120
[ACM-ICPC] Tree Isomorphism
Avatar for KuoE0 kuoe0
1
250

Other Decks in Programming

See All in Programming
状態遷移図を書こう / Sequence Chart vs State Diagram
Avatar for Kuniwak orgachem
PRO
1
130
XP, Testing and ninja testing
Avatar for seki at druby.org m_seki
3
250
「テストは愚直&&網羅的に書くほどよい」という誤解 / Test Smarter, Not Harder
Avatar for Munetoshi Ishikawa munetoshi
0
180
Deep Dive into ~/.claude/projects
Avatar for Yuya Hirayama hiragram
14
2.6k
Modern Angular with Signals and Signal Store: New Rules for Your Architecture @enterJS Advanced Angular Day 2025
Avatar for Manfred Steyer manfredsteyer
PRO
0
230
Claude Code + Container Use と Cursor で作る ローカル並列開発環境のススメ / ccc local dev
Avatar for Yuichi Maekawa kaelaela
11
6.1k
テストから始めるAgentic Coding 〜Claude Codeと共に行うTDD〜 / Agentic Coding starts with testing
Avatar for r-kagaya rkaga
13
4.9k
PHPでWebSocketサーバーを実装しよう2025
Avatar for kubotak kubotak
0
290
すべてのコンテキストを、 ユーザー価値に変える
Avatar for Michiru Kato applism118
3
1.4k
効率的な開発手段として VRTを活用する
Avatar for Yosuke Ishikawa ishkawa
0
150
Startups on Rails in Past, Present and Future–Irina Nazarova, RailsConf 2025
Avatar for Irina Nazarova irinanazarova
0
140
Blazing Fast UI Development with Compose Hot Reload (droidcon New York 2025)
Avatar for Márton Braun zsmb
1
300

Featured

See All Featured
Keith and Marios Guide to Fast Websites
Avatar for Keith Pitt keithpitt
411
22k
No one is an island. Learnings from fostering a developers community.
Avatar for Antonio thoeni
21
3.4k
Practical Orchestrator
Avatar for Shlomi Noach shlominoach
189
11k
Build your cross-platform service in a week with App Engine
Avatar for Jose L jlugia
231
18k
[RailsConf 2023 Opening Keynote] The Magic of Rails
Avatar for Eileen M. Uchitelle eileencodes
29
9.6k
Raft: Consensus for Rubyists
Avatar for Patrick Van Stee vanstee
140
7k
Docker and Python
Avatar for Tania Allard trallard
44
3.5k
4 Signs Your Business is Dying
Avatar for Josh Pigford shpigford
184
22k
Reflections from 52 weeks, 52 projects
Avatar for Jefferson Lam jeffersonlam
351
20k
Product Roadmaps are Hard
Avatar for C. Todd Lombardo iamctodd
PRO
54
11k
The Cult of Friendly URLs
Avatar for Andy Hume andyhume
79
6.5k
Building Better People: How to give real-time feedback that sticks.
Avatar for Will Jessup wjessup
367
19k

Transcript

  1. Quick Sort ֲࢸݢʢKuoE0ʣ [email protected] KuoE0.ch

  2. Latest update: Mar 15, 2013 Attribution-ShareAlike 3.0 Unported (CC BY-SA

    3.0) http://creativecommons.org/licenses/by-sa/3.0/

  3. Algorithm ࠾༻ divide & conquer ࡦུ

  4. Divide ኺᏐྻத௅ग़Ұݸݩૉ࡞ҝ pivotɼར ༻ pivot ሡݪᏐྻ෼ҝၷݸࢠᏐྻɿ • ॴ༗ݩૉখԙ pivot తᏐྻ

    A • ॴ༗ݩૉେԙ pivot తݩૉతᏐྻ B • ౳ԙ pivot తݩૉՄ์ஔࡏ೚Ұݸத

  5. 2 9 4 3 8 7 5 1 6

  6. 2 9 4 3 8 7 5 1 6 2

    7 4 3 5 1 6 9 8

  7. 9 8 2 4 3 5 1 6 2 9

    4 3 8 7 5 1 6 2 7 4 3 5 1 6 9 8

  8. 9 8 2 4 3 5 1 6 2 4

    5 1 6 2 9 4 3 8 7 5 1 6 2 7 4 3 5 1 6 9 8 3

  9. 4 5 6 2 1 9 8 2 4 3

    5 1 6 2 4 5 1 6 2 9 4 3 8 7 5 1 6 2 7 4 3 5 1 6 9 8 3

  10. 4 5 6 2 1 2 9 8 2 4

    3 5 1 6 2 4 5 1 6 2 9 4 3 8 7 5 1 6 2 7 4 3 5 1 6 9 8 3 1

  11. 4 5 6 2 1 2 9 8 2 4

    3 5 1 6 2 4 5 1 6 2 9 4 3 8 7 5 1 6 2 2 7 4 3 5 1 6 9 8 3 1

  12. 4 5 6 5 6 2 1 2 9 8

    2 4 3 5 1 6 2 4 5 1 6 2 9 4 3 8 7 5 1 6 2 2 7 4 3 5 1 6 9 8 3 1 4

  13. 5 6 4 5 6 5 6 2 1 2

    9 8 2 4 3 5 1 6 2 4 5 1 6 2 9 4 3 8 7 5 1 6 2 2 7 4 3 5 1 6 9 8 3 1 4

  14. 5 6 5 4 5 6 5 6 2 1

    2 9 8 2 4 3 5 1 6 2 4 5 1 6 2 9 4 3 8 7 5 1 6 2 2 7 4 3 5 1 6 9 8 3 1 4 6

  15. 5 6 5 4 5 6 5 6 2 1

    2 9 8 2 4 3 5 1 6 2 4 5 1 6 2 9 4 3 8 7 5 1 6 2 5 2 7 4 3 5 1 6 9 8 3 1 4 6

  16. 5 6 5 4 5 6 5 6 2 1

    2 9 8 9 2 4 3 5 1 6 2 4 5 1 6 2 9 4 3 8 7 5 1 6 2 5 2 7 4 3 5 1 6 9 8 3 1 4 6 8

  17. 5 6 5 4 5 6 5 6 2 1

    2 9 8 9 2 4 3 5 1 6 2 4 5 1 6 2 9 4 3 8 7 5 1 6 9 2 5 2 7 4 3 5 1 6 9 8 3 1 4 6 8

  18. Conquer ༝ԙࢠᏐྻቮඃ pivot ෼ҝၷஈɼҰஈ খԙ౳ԙ pivot తᏐྻ Aɼ㠥Ұஈେԙ ౳ԙ pivot

    తᏐྻ Bɻ

  19. Conquer ༝ԙࢠᏐྻቮඃ pivot ෼ҝၷஈɼҰஈ খԙ౳ԙ pivot తᏐྻ Aɼ㠥Ұஈେԙ ౳ԙ pivot

    తᏐྻ Bɻ A B C

  20. 2 2

  21. 2 2 1

  22. 2 2 1

  23. 1 2 1 2 2 5 2 5 1 6

  24. 1 2 1 2 2 5 2 5 1 6

  25. 5 6 1 2 1 2 5 6 2 5

    2 5 1 6 4

  26. 5 6 1 2 1 2 5 6 2 5

    2 5 1 6 4

  27. 4 5 6 5 6 1 2 1 2 4

    5 6 5 6 2 5 2 5 1 6 4 3

  28. 4 5 6 5 6 1 2 1 2 4

    5 6 5 6 2 5 2 5 1 6 4 3

  29. 1 2 3 4 5 6 4 5 6 5

    6 1 2 1 2 4 5 6 5 6 1 2 3 4 5 6 9 2 5 2 5 9 1 6 4 3 8

  30. 1 2 3 4 5 6 4 5 6 5

    6 1 2 1 2 4 5 6 5 6 1 2 3 4 5 6 9 2 5 2 5 9 1 6 4 3 8

  31. 8 9 1 2 3 4 5 6 8 9

    4 5 6 5 6 1 2 1 2 4 5 6 5 6 1 2 3 4 5 6 9 2 5 2 5 9 7 1 6 4 3 8

  32. 8 9 1 2 3 4 5 6 8 9

    4 5 6 5 6 1 2 1 2 4 5 6 5 6 1 2 3 4 5 6 9 2 5 2 5 9 7 1 6 4 3 8

  33. 8 9 1 2 3 4 5 6 8 9

    4 5 6 5 6 1 2 1 2 4 5 6 5 6 1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 9 2 5 2 5 9 7 1 6 4 3 8

  34. 9 3 How to Divide 4 1 5 8 6

    7 2

  35. 9 3 How to Divide 4 1 5 8 6

    4 7 2

  36. 9 3 How to Divide 4 1 5 8 6

    4 7 2

  37. 9 3 How to Divide 4 1 5 8 6

    4 7 2

  38. 9 3 How to Divide 4 1 5 8 6

    4 7 2

  39. 9 3 How to Divide 4 1 5 8 6

    4 7 2

  40. 9 3 How to Divide 4 1 5 8 6

    4 7 2

  41. 9 3 How to Divide 4 1 5 8 6

    4 7 2

  42. 9 3 How to Divide 4 1 5 8 6

    4 7 2

  43. 9 3 How to Divide 4 1 5 8 6

    4 7 2

  44. 9 3 How to Divide 4 1 5 8 6

    4 7 2 4 1 3 2 5 8 7 9 6

  45. 5 6 7 8 9 3 2 1 4 How

    to Conquer

  46. 5 6 7 8 9 3 2 1 4 How

    to Conquer

  47. 5 6 7 8 9 3 2 1 4 How

    to Conquer

  48. 5 6 7 8 9 3 2 1 4 How

    to Conquer

  49. void quickSort( int L, int R ) { if (

    R - L <= 1 ) return; int pivot = N[ R - 1 ], p = L; for ( int i = L; i < R - 1; ++i ) { if ( N[ i ] <= pivot ) { swap( N[ i ], N[ p ] ); ++p; } } swap( N[ R - 1 ], N[ p ] ); quickSort( L, p ); quickSort( p + 1, R ); } In-place Version

  50. 9 4 3 6 5 1 8 7 How to

    Divide 2

  51. 9 4 3 6 5 1 8 7 How to

    Divide 2 6

  52. 9 4 3 6 5 1 8 7 How to

    Divide 2 2 6

  53. 9 4 3 6 5 1 8 7 How to

    Divide 2 2 6

  54. 9 4 3 6 5 1 8 7 How to

    Divide 2 2 2 6

  55. 9 9 4 3 6 5 1 8 7 How

    to Divide 2 2 2 6

  56. 9 9 4 4 3 6 5 1 8 7

    How to Divide 2 2 2 9 6

  57. 9 9 4 4 3 6 5 1 8 7

    How to Divide 2 2 2 9 6

  58. 9 9 4 4 3 6 5 1 8 7

    How to Divide 2 2 2 9 4 6

  59. 9 9 4 4 3 3 6 5 1 8

    7 How to Divide 2 2 2 9 4 6

  60. 9 9 4 4 3 3 6 5 1 8

    7 How to Divide 2 2 2 9 4 6

  61. 9 9 4 4 3 3 6 5 1 8

    7 How to Divide 2 2 2 9 4 3 6

  62. 9 9 4 4 3 3 6 5 1 8

    7 8 How to Divide 2 2 2 9 4 3 6

  63. 9 9 4 4 3 3 6 5 1 8

    7 8 8 How to Divide 2 2 2 9 4 3 6

  64. 9 9 4 4 3 3 6 5 1 8

    7 8 7 8 How to Divide 2 2 2 9 4 3 6

  65. 9 9 4 4 3 3 6 5 1 8

    7 8 7 8 7 How to Divide 2 2 2 9 4 3 6

  66. 9 9 4 4 3 3 6 5 1 5

    8 7 8 7 8 7 How to Divide 2 2 2 9 4 3 6

  67. 9 9 4 4 3 3 6 5 1 5

    8 7 8 7 8 7 How to Divide 2 2 2 9 4 3 6

  68. 9 9 4 4 3 3 6 5 1 5

    8 7 8 7 8 7 How to Divide 2 2 2 5 9 4 3 6

  69. 9 9 4 4 3 3 6 5 1 5

    8 7 8 7 8 7 How to Divide 2 2 2 5 9 4 3 1 6

  70. 9 9 4 4 3 3 6 5 1 5

    8 7 8 7 8 7 How to Divide 2 2 2 5 9 4 3 1 6

  71. 9 9 4 4 3 3 6 5 1 5

    8 7 8 7 8 7 How to Divide 2 2 2 5 9 4 3 1 1 6

  72. 9 9 4 4 3 3 6 5 1 5

    8 7 8 7 8 7 How to Divide 2 2 2 5 9 4 3 1 1 6

  73. 9 9 4 4 3 3 6 5 1 5

    8 7 8 7 8 7 How to Divide 2 2 2 5 9 4 3 1 1 6 2 5 4 3 1 8 9 7

  74. 6 How to Conquer 1 4 2 3 5 8

    7 9 1 4 2 3 5 8 7 9

  75. 6 How to Conquer 1 4 2 3 5 8

    7 9 1 4 2 3 5 8 7 9

  76. End