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Quick Sort ֲࢸݢʢKuoE0ʣ [email protected] KuoE0.ch

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Latest update: Mar 15, 2013 Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) http://creativecommons.org/licenses/by-sa/3.0/

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Algorithm ࠾༻ divide & conquer ࡦུ

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Divide ኺᏐྻத௅ग़Ұݸݩૉ࡞ҝ pivotɼར ༻ pivot ሡݪᏐྻ෼ҝၷݸࢠᏐྻɿ • ॴ༗ݩૉখԙ pivot తᏐྻ A • ॴ༗ݩૉେԙ pivot తݩૉతᏐྻ B • ౳ԙ pivot తݩૉՄ์ஔࡏ೚Ұݸத

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

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Conquer ༝ԙࢠᏐྻቮඃ pivot ෼ҝၷஈɼҰஈ খԙ౳ԙ pivot తᏐྻ Aɼ㠥Ұஈେԙ ౳ԙ pivot తᏐྻ Bɻ A B C

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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

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End