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快速排序: .ZtW
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package org.rut.util.algorithm.support; m7#v2:OD+
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import org.rut.util.algorithm.SortUtil; =w5]o@
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/** '.B5CQ
* @author treeroot fxQ4kiI
* @since 2006-2-2 `GU Gy. b
* @version 1.0 "Snt~:W>
*/ GBY-WN4sc[
public class QuickSort implements SortUtil.Sort{ 0$g;O5y"i
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/* (non-Javadoc) *|4/XHi
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) g\2/Ia+/@
*/ p![UO I"W
public void sort(int[] data) { |[_%zV;p>v
quickSort(data,0,data.length-1); #E$*PAB
} %,UTFuM`
private void quickSort(int[] data,int i,int j){ j 06mky
int pivotIndex=(i+j)/2; V(5*Dn84
//swap }?)U`zF)7}
SortUtil.swap(data,pivotIndex,j);
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int k=partition(data,i-1,j,data[j]); T
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SortUtil.swap(data,k,j); JHXtKgFX
if((k-i)>1) quickSort(data,i,k-1); Gk']Ma2J}
if((j-k)>1) quickSort(data,k+1,j); ;#?G2AAv
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} z -c1,GOD
/** C=Tq/L w
* @param data {ePtZyo0
* @param i vR7S!
* @param j ^M)+2@6
* @return 7G+E+A5o&
*/ K>vi9,4/ks
private int partition(int[] data, int l, int r,int pivot) { $%6.lQ
do{ yvWM]A
while(data[++l] while((r!=0)&&data[--r]>pivot); 9RPZj>ezjA
SortUtil.swap(data,l,r); ;(-Wc9=
} tc0(G~.N
while(l SortUtil.swap(data,l,r); $@HW|Y
return l; eg1Mdg\a
} FnPn#Cv>*
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} zRMz8IC.
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改进后的快速排序: I {%Y0S
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package org.rut.util.algorithm.support; cTBUj
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import org.rut.util.algorithm.SortUtil; 7?;ZE:
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/** /Un\P
* @author treeroot Z<iK(?@O
* @since 2006-2-2 $|tk?Sps
* @version 1.0 25j?0P"&
*/ . {vMn0c
public class ImprovedQuickSort implements SortUtil.Sort { A*~BkvPr
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private static int MAX_STACK_SIZE=4096; PA*1]i#2M=
private static int THRESHOLD=10; 7_R[=t
/* (non-Javadoc) ?3%r:g4
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) y>X(GF^
*/ Px3I+VP
public void sort(int[] data) { <@$+uZt+
int[] stack=new int[MAX_STACK_SIZE]; S.Q:O{]
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int top=-1; %ol\ sO|
int pivot; [Z2{S-)UM
int pivotIndex,l,r; mM r$~^P:
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stack[++top]=0; ^3ai}Ei3
stack[++top]=data.length-1; ^#t6/fY.#
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while(top>0){ _<GXR
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int j=stack[top--]; {"2Hv;x
int i=stack[top--]; Mh2Zj
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pivotIndex=(i+j)/2; VU1Wr|
pivot=data[pivotIndex]; "g*`G<