$30 off During Our Annual Pro Sale. View Details »

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
100
面試面試面試，因為很重要所以要說三次！
Avatar for KuoE0 kuoe0
2
260
應徵軟體工程師
Avatar for KuoE0 kuoe0
0
180
面試心得分享
Avatar for KuoE0 kuoe0
0
420
Windows 真的不好用...
Avatar for KuoE0 kuoe0
0
300
Python @Wheel Lab
Avatar for KuoE0 kuoe0
0
220
Introduction to VP8
Avatar for KuoE0 kuoe0
0
260
Python @NCKU_CSIE
Avatar for KuoE0 kuoe0
0
130
[ACM-ICPC] Tree Isomorphism
Avatar for KuoE0 kuoe0
1
260

Other Decks in Programming

See All in Programming
「コードは上から下へ読むのが一番」と思った時に、思い出してほしい話
Avatar for HideyukiKitao panda728
PRO
38
25k
組み合わせ爆発にのまれない - 責務分割 x テスト
Avatar for HAL halhorn
1
140
20251127_ぼっちのための懇親会対策会議
Avatar for kokamoto01 kokamoto01_metaps
2
420
Navigation 3: 적응형 UI를 위한 앱 탐색
Avatar for Sungyong An fornewid
1
220
tparseでgo testの出力を見やすくする
Avatar for utagawa kiki utgwkk
1
190
How Software Deployment tools have changed in the past 20 years
Avatar for Geshan Manandhar geshan
0
28k
connect-python: convenient protobuf RPC for Python
Avatar for Anuraag Agrawal anuraaga
0
380
從冷知識到漏洞，你不懂的 Web，駭客懂 - Huli @ WebConf Taiwan 2025
Avatar for Huli aszx87410
1
1.2k
関数実行の裏側では何が起きているのか？
Avatar for minop1205 minop1205
1
680
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
Avatar for Shogo Fukami shogo4131
8
2.3k
Developing static sites with Ruby
Avatar for Masafumi Okura okuramasafumi
0
250
MAP, Jigsaw, Code Golf 振り返り会 by 関東Kaggler会|Jigsaw 15th Solution
Avatar for s.konishi hasibirok0
0
230

Featured

See All Featured
CSS Pre-Processors: Stylus, Less & Sass
Avatar for Bermon Painter bermonpainter
359
30k
XXLCSS - How to scale CSS and keep your sanity
Avatar for Zaharenia Atzitzikaki sugarenia
249
1.3M
Docker and Python
Avatar for Tania Allard trallard
47
3.7k
Code Review Best Practice
Avatar for Trisha Gee trishagee
74
19k
The Pragmatic Product Professional
Avatar for Laura Van Doore lauravandoore
37
7.1k
Build The Right Thing And Hit Your Dates
Avatar for Maggie C. maggiecrowley
38
3k
Into the Great Unknown - MozCon
Avatar for Noah Learner thekraken
40
2.2k
Facilitating Awesome Meetings
Avatar for Lara Hogan lara
57
6.7k
Reflections from 52 weeks, 52 projects
Avatar for Jefferson Lam jeffersonlam
355
21k
Speed Design
Avatar for Sergey Chernyshev sergeychernyshev
33
1.4k
Product Roadmaps are Hard
Avatar for C. Todd Lombardo iamctodd
PRO
55
12k
Code Reviewing Like a Champion
Avatar for maltzj maltzj
527
40k

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