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快速排序: EXT_x q
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package org.rut.util.algorithm.support; J/ ^|Y6
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import org.rut.util.algorithm.SortUtil; G1:2MPH
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/** O$ ;:5zT
* @author treeroot m_r_4BP
* @since 2006-2-2 vq*)2.
* @version 1.0 JheF}/Bx
*/ [<7Vv_\Q
public class QuickSort implements SortUtil.Sort{ s~Od(,K
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/* (non-Javadoc) }u8 D5Q<(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) (eJYv:
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*/ WjvD C"
public void sort(int[] data) { Kly`V]XE
quickSort(data,0,data.length-1); >L>t$1hXM
} do(komP<\
private void quickSort(int[] data,int i,int j){ '74-rL:i
int pivotIndex=(i+j)/2; 7ezf.[{R
//swap 1?bX$$yl;
SortUtil.swap(data,pivotIndex,j); -g]g
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int k=partition(data,i-1,j,data[j]); VwV`tKit
SortUtil.swap(data,k,j); fd Rw:K8
if((k-i)>1) quickSort(data,i,k-1); = A;B-_c
if((j-k)>1) quickSort(data,k+1,j); 0 SeDBs
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} B!cg)Y?.bd
/** ?[G!6
* @param data vS|uN(a.P
* @param i s`:-6{E
* @param j $!_]mz6*
* @return Ge]2g0
*/ |_J[n!~f7
private int partition(int[] data, int l, int r,int pivot) { -6KGQc}U
do{ )m Uc
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while(data[++l] while((r!=0)&&data[--r]>pivot); #c ndq[H
SortUtil.swap(data,l,r); $G5;y>
} N{<=s]I%x
while(l SortUtil.swap(data,l,r); YdK]%%
return l; ~"+Fp&[9f
} v"6ijk&(
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} nsJN)Pt
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改进后的快速排序: / 1jb8w'
@,63%
package org.rut.util.algorithm.support; ^rc!X]C9
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import org.rut.util.algorithm.SortUtil; FSqS]6b3
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/** ]&3UF?
* @author treeroot Gv!*
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* @since 2006-2-2 &r6VF/
* @version 1.0 k@eU #c5c
*/ 1CiK&fQ'
public class ImprovedQuickSort implements SortUtil.Sort { VR>;{>~
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private static int MAX_STACK_SIZE=4096; :o}Ju}t
private static int THRESHOLD=10; {iqH 27\E
/* (non-Javadoc) n:GK0wu.s
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) LX e {
*/ kne{Tp
public void sort(int[] data) { .Z}ySd:X
int[] stack=new int[MAX_STACK_SIZE]; &Z_W*D
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int top=-1; D5]sf>~
int pivot; bmEo5f~C!
int pivotIndex,l,r; DYU+?[J
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stack[++top]=0; Yw=Ve 0
stack[++top]=data.length-1; w<