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快速排序: #a'CoJs
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package org.rut.util.algorithm.support; _d+` Gw
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import org.rut.util.algorithm.SortUtil; vV*/"'>
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/** K6@ %@v
* @author treeroot FI)0.p
* @since 2006-2-2 wo$ F_!3u
* @version 1.0 ;&kZ7%
*/ 8%xiHPVg
public class QuickSort implements SortUtil.Sort{ 1F+nWc2 b
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/* (non-Javadoc) Hq>rK`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) RB;2
*/ 75A60Uw
public void sort(int[] data) { :5jor Vu
quickSort(data,0,data.length-1); 23opaX5V=
} @V@<j)3P
private void quickSort(int[] data,int i,int j){ ,4}s 1J#
int pivotIndex=(i+j)/2; p%/lP{
//swap 2uMSeSx$
SortUtil.swap(data,pivotIndex,j); :U]Pm:ivTU
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int k=partition(data,i-1,j,data[j]); E/D@;Ym18
SortUtil.swap(data,k,j); 3wfJ!z-E8
if((k-i)>1) quickSort(data,i,k-1); vkW;qt}yO
if((j-k)>1) quickSort(data,k+1,j); 'C;KNc
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} faZc18M^1
/** a t=;}}X
* @param data e`)zR'As
* @param i f9'dZ}B
* @param j B74]hgK
* @return Hl8\*#;C&>
*/ Rn{X+b.
private int partition(int[] data, int l, int r,int pivot) { B0gs<E
do{ RhE|0N=
while(data[++l] while((r!=0)&&data[--r]>pivot); u
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SortUtil.swap(data,l,r); #jg3Ku;Y
} -cUw}
while(l SortUtil.swap(data,l,r); t 1G2A`
return l; #rp)Gc
} 1J&hm[3[K
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} ;@n/gU
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改进后的快速排序: )Rj?\ZUR
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package org.rut.util.algorithm.support; 0_t9;;y :
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