Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Quick Sort
Search
KuoE0
March 15, 2013
Programming
5
10k
Quick Sort
KuoE0
March 15, 2013
Tweet
Share
More Decks by KuoE0
See All by KuoE0
Protocol handler in Gecko
kuoe0
0
96
面試面試面試,因為很重要所以要說三次!
kuoe0
2
240
應徵軟體工程師
kuoe0
0
160
面試心得分享
kuoe0
0
410
Windows 真的不好用...
kuoe0
0
280
Python @Wheel Lab
kuoe0
0
200
Introduction to VP8
kuoe0
0
240
Python @NCKU_CSIE
kuoe0
0
120
[ACM-ICPC] Tree Isomorphism
kuoe0
1
250
Other Decks in Programming
See All in Programming
オンコール⼊⾨〜ページャーが鳴る前に、あなたが備えられること〜 / Before The Pager Rings
yktakaha4
1
770
なぜ「共通化」を考え、失敗を繰り返すのか
rinchoku
1
670
TypeScriptでDXを上げろ! Hono編
yusukebe
3
650
Python型ヒント完全ガイド 初心者でも分かる、現代的で実践的な使い方
mickey_kubo
1
180
20250708_JAWS_opscdk
takuyay0ne
2
120
ソフトウェア品質を数字で捉える技術。事業成長を支えるシステム品質の マネジメント
takuya542
2
14k
明示と暗黙 ー PHPとGoの インターフェイスの違いを知る
shimabox
2
590
#QiitaBash MCPのセキュリティ
ryosukedtomita
1
1.5k
CDK引数設計道場100本ノック
badmintoncryer
2
360
チームのテスト力を総合的に鍛えて品質、スピード、レジリエンスを共立させる/Testing approach that improves quality, speed, and resilience
goyoki
5
1k
Rails Frontend Evolution: It Was a Setup All Along
skryukov
0
240
効率的な開発手段として VRTを活用する
ishkawa
0
150
Featured
See All Featured
Fireside Chat
paigeccino
37
3.5k
Adopting Sorbet at Scale
ufuk
77
9.5k
A better future with KSS
kneath
238
17k
Thoughts on Productivity
jonyablonski
69
4.7k
Statistics for Hackers
jakevdp
799
220k
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
18
980
It's Worth the Effort
3n
185
28k
GitHub's CSS Performance
jonrohan
1031
460k
Code Review Best Practice
trishagee
69
19k
Speed Design
sergeychernyshev
32
1k
VelocityConf: Rendering Performance Case Studies
addyosmani
332
24k
Balancing Empowerment & Direction
lara
1
440
Transcript
Quick Sort ֲࢸݢʢKuoE0ʣ
[email protected]
KuoE0.ch
Latest update: Mar 15, 2013 Attribution-ShareAlike 3.0 Unported (CC BY-SA
3.0) http://creativecommons.org/licenses/by-sa/3.0/
Algorithm ࠾༻ divide & conquer ࡦུ
Divide ኺᏐྻதग़Ұݸݩૉ࡞ҝ pivotɼར ༻ pivot ሡݪᏐྻҝၷݸࢠᏐྻɿ • ॴ༗ݩૉখԙ pivot తᏐྻ
A • ॴ༗ݩૉେԙ pivot తݩૉతᏐྻ B • ԙ pivot తݩૉՄ์ஔࡏҰݸத
2 9 4 3 8 7 5 1 6
2 9 4 3 8 7 5 1 6 2
7 4 3 5 1 6 9 8
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
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
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
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
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
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
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
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
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
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
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
Conquer ༝ԙࢠᏐྻቮඃ pivot ҝၷஈɼҰஈ খԙԙ pivot తᏐྻ Aɼ㠥Ұஈେԙ ԙ pivot
తᏐྻ Bɻ
Conquer ༝ԙࢠᏐྻቮඃ pivot ҝၷஈɼҰஈ খԙԙ pivot తᏐྻ Aɼ㠥Ұஈେԙ ԙ pivot
తᏐྻ Bɻ A B C
2 2
2 2 1
2 2 1
1 2 1 2 2 5 2 5 1 6
1 2 1 2 2 5 2 5 1 6
5 6 1 2 1 2 5 6 2 5
2 5 1 6 4
5 6 1 2 1 2 5 6 2 5
2 5 1 6 4
4 5 6 5 6 1 2 1 2 4
5 6 5 6 2 5 2 5 1 6 4 3
4 5 6 5 6 1 2 1 2 4
5 6 5 6 2 5 2 5 1 6 4 3
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
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
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
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
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
9 3 How to Divide 4 1 5 8 6
7 2
9 3 How to Divide 4 1 5 8 6
4 7 2
9 3 How to Divide 4 1 5 8 6
4 7 2
9 3 How to Divide 4 1 5 8 6
4 7 2
9 3 How to Divide 4 1 5 8 6
4 7 2
9 3 How to Divide 4 1 5 8 6
4 7 2
9 3 How to Divide 4 1 5 8 6
4 7 2
9 3 How to Divide 4 1 5 8 6
4 7 2
9 3 How to Divide 4 1 5 8 6
4 7 2
9 3 How to Divide 4 1 5 8 6
4 7 2
9 3 How to Divide 4 1 5 8 6
4 7 2 4 1 3 2 5 8 7 9 6
5 6 7 8 9 3 2 1 4 How
to Conquer
5 6 7 8 9 3 2 1 4 How
to Conquer
5 6 7 8 9 3 2 1 4 How
to Conquer
5 6 7 8 9 3 2 1 4 How
to Conquer
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
9 4 3 6 5 1 8 7 How to
Divide 2
9 4 3 6 5 1 8 7 How to
Divide 2 6
9 4 3 6 5 1 8 7 How to
Divide 2 2 6
9 4 3 6 5 1 8 7 How to
Divide 2 2 6
9 4 3 6 5 1 8 7 How to
Divide 2 2 2 6
9 9 4 3 6 5 1 8 7 How
to Divide 2 2 2 6
9 9 4 4 3 6 5 1 8 7
How to Divide 2 2 2 9 6
9 9 4 4 3 6 5 1 8 7
How to Divide 2 2 2 9 6
9 9 4 4 3 6 5 1 8 7
How to Divide 2 2 2 9 4 6
9 9 4 4 3 3 6 5 1 8
7 How to Divide 2 2 2 9 4 6
9 9 4 4 3 3 6 5 1 8
7 How to Divide 2 2 2 9 4 6
9 9 4 4 3 3 6 5 1 8
7 How to Divide 2 2 2 9 4 3 6
9 9 4 4 3 3 6 5 1 8
7 8 How to Divide 2 2 2 9 4 3 6
9 9 4 4 3 3 6 5 1 8
7 8 8 How to Divide 2 2 2 9 4 3 6
9 9 4 4 3 3 6 5 1 8
7 8 7 8 How to Divide 2 2 2 9 4 3 6
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
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
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
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
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
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
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
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
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
6 How to Conquer 1 4 2 3 5 8
7 9 1 4 2 3 5 8 7 9
6 How to Conquer 1 4 2 3 5 8
7 9 1 4 2 3 5 8 7 9
End