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快速排序: j@Ta\a-,x
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package org.rut.util.algorithm.support; UqA<rW
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import org.rut.util.algorithm.SortUtil; Z)7|m
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/** R ^ln-H;
* @author treeroot vg"$&YX9"
* @since 2006-2-2 %$*WdK#
* @version 1.0 *6`};ASK
*/ :;g7T -_q
public class QuickSort implements SortUtil.Sort{ it#,5#Y:
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/* (non-Javadoc) k vQ]
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,bGYixIfYZ
*/ 'Zket=Sm;
public void sort(int[] data) { 0^-1/Ec
quickSort(data,0,data.length-1); yU{Q`6u T
} #3_t}<fX
private void quickSort(int[] data,int i,int j){ "G[yV>pxv
int pivotIndex=(i+j)/2; [gybdI5wur
//swap 9sI&&Jg
SortUtil.swap(data,pivotIndex,j); TpH-_ft
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int k=partition(data,i-1,j,data[j]); F*['1eAmdY
SortUtil.swap(data,k,j); JnY.]:
if((k-i)>1) quickSort(data,i,k-1); (oxMBd+n1
if((j-k)>1) quickSort(data,k+1,j); T1\@4x
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} {2v,J]v_[
/** b3M`vJ+{
* @param data }HKt{k&$
* @param i ^D5+S`V
* @param j 5@-[[ $dk
* @return Q&@e,7]V+
*/ [a[.tR38e
private int partition(int[] data, int l, int r,int pivot) { _)%Sz"g^Ix
do{ N87)rhXSo,
while(data[++l] while((r!=0)&&data[--r]>pivot); hR+\,P#G[
SortUtil.swap(data,l,r); WZQ
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} NE)Yd7m-
while(l SortUtil.swap(data,l,r); /Pyj|!C3`q
return l; >|1$Pv?
} ]/6i#fTw
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} %nV6#pr
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改进后的快速排序: O\+b1+&b3Y
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package org.rut.util.algorithm.support; *w`_(Xf
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import org.rut.util.algorithm.SortUtil; +/n<]?(T
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/** UGD B4S
* @author treeroot H{et2J<H
* @since 2006-2-2 rX}FhBl5
* @version 1.0 + usB$=kJ
*/ {X EX0|TZ
public class ImprovedQuickSort implements SortUtil.Sort { Mc9J Fzp
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private static int MAX_STACK_SIZE=4096; QX+Xi<YE-
private static int THRESHOLD=10; X#<+D1P
/* (non-Javadoc) ;Qi0j<dXd
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &[7z:`+Y##
*/ {WvYb,
public void sort(int[] data) { 9U4 D$M
int[] stack=new int[MAX_STACK_SIZE]; ,}:}"cl
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int top=-1; ix_&os]L_
int pivot; MG,)|XpyWJ
int pivotIndex,l,r; Ei4Iv#Oi`
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stack[++top]=0; "BZL*hHq
stack[++top]=data.length-1; jct'B}@X(
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while(top>0){ 0[f[6mm%m
int j=stack[top--]; 4YgO1}%G
int i=stack[top--]; &EhOSu
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pivotIndex=(i+j)/2; .#}A/V.-Y
pivot=data[pivotIndex]; i8A-h6E
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SortUtil.swap(data,pivotIndex,j); K SJ Ko
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//partition E>N [
l=i-1; Fh4Exl@6
r=j; vDIsawbHD
do{ 8gG;A8
while(data[++l] while((r!=0)&&(data[--r]>pivot)); </b_Rar
SortUtil.swap(data,l,r); )6%a9&~H
} (+}44Ldt
while(l SortUtil.swap(data,l,r); ]MC5 uKn
SortUtil.swap(data,l,j); kG5Uc83#G
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if((l-i)>THRESHOLD){ DT_%Rz~<
stack[++top]=i; wRZS+^hx
stack[++top]=l-1; &x$ps
} c<sq0('`
if((j-l)>THRESHOLD){ 4wWfaL5"
stack[++top]=l+1; =}0$|@pl
stack[++top]=j; xZ(d*/6E
} Sbeq%Iwm.
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} }*b\=AS=
//new InsertSort().sort(data); cYBjsN(!A|
insertSort(data); RY1-Zjlb<
} ?X Rl\V
/** 7X>*B~(R
* @param data T-]UAN"O
*/ cC]]H&'Hg+
private void insertSort(int[] data) { "'XYW\bI
int temp; m}]QP\
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); $ab{GxmX'4
} 5bd4]1gj
} m_FTg)_=
} q29d=
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} 1~j,A[&|<
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