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快速排序: Uc_`Eh3y
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package org.rut.util.algorithm.support; nj^q@h
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import org.rut.util.algorithm.SortUtil; *76viqY;dE
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/** Mj
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* @author treeroot )n}]]^Sc
* @since 2006-2-2 4ZJT[zi
* @version 1.0 U++~3e@l
*/ r` `iC5Ii
public class QuickSort implements SortUtil.Sort{ AqbT{,3yW
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/* (non-Javadoc) R_>TEYZ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) hG~]~ )
*/ W]D`f8r9
public void sort(int[] data) { {nPkb5xbW
quickSort(data,0,data.length-1); u@bOEcxK
} =F%wlzF:
private void quickSort(int[] data,int i,int j){ J`+`Kq1T
int pivotIndex=(i+j)/2; hGA!1a4 c
//swap < [S1_2b.t
SortUtil.swap(data,pivotIndex,j); }.MoDR3\
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int k=partition(data,i-1,j,data[j]); c7g.|R
SortUtil.swap(data,k,j); X4} `>
if((k-i)>1) quickSort(data,i,k-1); 1R2o6`_
if((j-k)>1) quickSort(data,k+1,j); p_5>?[TW:
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} \_gp50(3
/** ]~\SR0
* @param data hr<7l
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* @param i F8S~wW=\w
* @param j ,dZ#,<
* @return ^%oG8z,L
*/ <RoX| zJw
private int partition(int[] data, int l, int r,int pivot) { 20/P M9
do{ i|c`M/) h:
while(data[++l] while((r!=0)&&data[--r]>pivot); :!I)r$
SortUtil.swap(data,l,r); JMirz~%ib
} pY)j0tdd
while(l SortUtil.swap(data,l,r); hINnb7o
return l; Q.9Ph
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} ]@/^_f>D
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} MJ>Qq[0
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改进后的快速排序: &ppE|[{
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package org.rut.util.algorithm.support; -B *<Q[_
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import org.rut.util.algorithm.SortUtil; R(2HYZ
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/** us\%BxxI9
* @author treeroot _H4$$
* @since 2006-2-2 9 {O2B5u1
* @version 1.0 KH2F#[
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*/ ol?z<53X]
public class ImprovedQuickSort implements SortUtil.Sort { {+C %D'
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private static int MAX_STACK_SIZE=4096; t,=@hs
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private static int THRESHOLD=10; r,u<y_YW
/* (non-Javadoc) (o x4K{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 2vqmsl?
*/ %A)-m 69
public void sort(int[] data) { mJ8{lXq3!
int[] stack=new int[MAX_STACK_SIZE]; {?EEIfg
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int top=-1; e;A^.\SP
int pivot; ;Cr_NP[8|j
int pivotIndex,l,r; cg(QjH"
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stack[++top]=0; W{fULl
stack[++top]=data.length-1; zG-_!FIn
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while(top>0){ >a&