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快速排序: GJE+sqMX1
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package org.rut.util.algorithm.support; (yuOY/~k/
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import org.rut.util.algorithm.SortUtil; @Ss W
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/** 9)=bBQyr:
* @author treeroot "B"ql-K
* @since 2006-2-2 ';.y`{/
* @version 1.0 RHvKWt
*/ ,d.5K*?aI
public class QuickSort implements SortUtil.Sort{ y!S:d
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/* (non-Javadoc) n++ak\
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) S_??G:i
*/ =1!.g"0
public void sort(int[] data) { TL$w~dY
quickSort(data,0,data.length-1); ;F%EW`7
} <pG 4g
private void quickSort(int[] data,int i,int j){ 2p 7;v7)y
int pivotIndex=(i+j)/2; ;.$vDin6
//swap bh\2&]Di/
SortUtil.swap(data,pivotIndex,j); wXdt\@Qr
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int k=partition(data,i-1,j,data[j]); } 21!b :a
SortUtil.swap(data,k,j); Sc}Rs
if((k-i)>1) quickSort(data,i,k-1); u~'_Uqp
if((j-k)>1) quickSort(data,k+1,j); |L}tAS`8
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} kxA T
/** fcohYo5mh
* @param data [(8s\>T
* @param i 5yV>-XT+-
* @param j +zo\#8*0MF
* @return mL;oR4{
*/ G$/Qcr6W<
private int partition(int[] data, int l, int r,int pivot) { $Grk{]nT
do{ hS%oQ)zvE
while(data[++l] while((r!=0)&&data[--r]>pivot); 81I9xqvSd~
SortUtil.swap(data,l,r); mpIR: Im
} 7fT_]H8
while(l SortUtil.swap(data,l,r); PCc{0Rp\vk
return l; wYv++<
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} dd6l+z
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改进后的快速排序: :F"NF
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package org.rut.util.algorithm.support; bQ0+Y?,+/
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import org.rut.util.algorithm.SortUtil; ?xQm_
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/** )g U#[}6H
* @author treeroot THCvcU?X
* @since 2006-2-2 o6:]Hvqjr
* @version 1.0 cy2K#
*/ oHu 7<r
public class ImprovedQuickSort implements SortUtil.Sort { S\k(0Sv9D
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private static int MAX_STACK_SIZE=4096; zItGoJu
private static int THRESHOLD=10; 2ryg3%+O
/* (non-Javadoc) 3JF" O+@
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) i>pUTT
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*/ ySlGqR1H
public void sort(int[] data) { Q$yQ^ mG
int[] stack=new int[MAX_STACK_SIZE]; `@<)#9'A
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int top=-1; I]91{dq
int pivot; !]z4'* )W
int pivotIndex,l,r; M=5hp&=
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stack[++top]=0; axkNy}ct
stack[++top]=data.length-1; ORIXcj]
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while(top>0){ I$fm"N
int j=stack[top--]; kNrd=s,-]D
int i=stack[top--]; -x>2Wb~%
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pivotIndex=(i+j)/2; 0y;1Dk!
pivot=data[pivotIndex]; vC^n_
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SortUtil.swap(data,pivotIndex,j); ?Vi U%t8J5
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//partition lygv#s-T
l=i-1; /jn0Xh
r=j; *i,A(f'e4X
do{ 7{OD/*|
while(data[++l] while((r!=0)&&(data[--r]>pivot)); WG5)-;>q|
SortUtil.swap(data,l,r); *MXE>
} >#5jO9
while(l SortUtil.swap(data,l,r); lMjeq.5nP
SortUtil.swap(data,l,j); :-T[)Q+-3
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if((l-i)>THRESHOLD){ QM=Y}
stack[++top]=i; .JWN\\
stack[++top]=l-1; Es1T{<G|w
} ByjgM`
if((j-l)>THRESHOLD){ OT3~5j1[
stack[++top]=l+1; xGw|@d
stack[++top]=j; #8B4*gAM
} z3|5E#m
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} %$+bO/f
//new InsertSort().sort(data); @`rC2-V
insertSort(data); *#o2b-[V
} zIc_'Z,b
/** ,+'VQa"]
* @param data rCdTn+O2
*/ Pt7yYl&n7^
private void insertSort(int[] data) { eOUEhpE
int temp; T2ZN=)xZ1
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); fa(- &;q
} vF'Y; M
} ?s9f}>
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