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快速排序: MO:##C
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package org.rut.util.algorithm.support; ZbYwuyHk(3
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import org.rut.util.algorithm.SortUtil; }`$:3mb&f
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/** C9/?B:
* @author treeroot p1HU2APFP
* @since 2006-2-2 j$#pG
* @version 1.0 DsqsMlB{
*/ 8 F'i5i
public class QuickSort implements SortUtil.Sort{ k3[
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/* (non-Javadoc) _VR Sdr5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) !GMb~
*/ n]x4twZ
public void sort(int[] data) { 2F3IC
quickSort(data,0,data.length-1); Mz<4P3"H
} mj<(qZh
private void quickSort(int[] data,int i,int j){ {W}.z
int pivotIndex=(i+j)/2; %#NaM\=8v
//swap 7g5sJj
SortUtil.swap(data,pivotIndex,j); +V&b<y;?>
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int k=partition(data,i-1,j,data[j]); /40Z-'Bl=(
SortUtil.swap(data,k,j); W;,.OoDc>
if((k-i)>1) quickSort(data,i,k-1); pN&Dpz^
if((j-k)>1) quickSort(data,k+1,j); xkOyj`IS
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} /MSz{ %v
/** {t[j>_MYw
* @param data ?N#mD
* @param i !a3cEzs3
* @param j ]}F_nc2L
* @return fk P@e3
*/ `6!l!8
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private int partition(int[] data, int l, int r,int pivot) { ReP7c3D>p
do{ 6@!<'l%z
while(data[++l] while((r!=0)&&data[--r]>pivot); 3bpbk
SortUtil.swap(data,l,r); )KR9al f3
} <!&nyuSz
while(l SortUtil.swap(data,l,r); PBr-<J
return l; kAf:_0?6
} PP&AF?C
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改进后的快速排序: IZ3w.:A
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package org.rut.util.algorithm.support; ]BCH9%zLj
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import org.rut.util.algorithm.SortUtil; Hbx=vLQ6
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/** Yv9(8
* @author treeroot 1d|+7
* @since 2006-2-2 ?`,UW; Br6
* @version 1.0 iO3@2J
*/ Tm[IOuhM'?
public class ImprovedQuickSort implements SortUtil.Sort { j$zw(EkN
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private static int MAX_STACK_SIZE=4096; eqs.zL
private static int THRESHOLD=10; d/- f]
/* (non-Javadoc) <<v,9*h
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) vgHMVzxj
*/ z)q9O_g9
public void sort(int[] data) { .5|wy<
int[] stack=new int[MAX_STACK_SIZE]; E@R7b(:*
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int top=-1; N(]6pG=
int pivot; 'wLQ9o%=p|
int pivotIndex,l,r; ^{-J Y
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stack[++top]=0; g-meJhX%
stack[++top]=data.length-1; Am!$\T%2
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while(top>0){ ,#UaWq@7
int j=stack[top--]; hFZ7{pj
int i=stack[top--]; UbJ_'>hK 6
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pivotIndex=(i+j)/2; :^1 Xfc"
pivot=data[pivotIndex]; jUZ84Gm{
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SortUtil.swap(data,pivotIndex,j); XJC|6"n
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//partition &voyEvX/S
l=i-1; wvcG <sj
r=j; 3uz@JY"mK
do{ !V$m!i;
while(data[++l] while((r!=0)&&(data[--r]>pivot)); -2w\8]u
SortUtil.swap(data,l,r); 4rc4}Yu,JI
} STL_#|[RM
while(l SortUtil.swap(data,l,r); 8{@|M l
SortUtil.swap(data,l,j); `3SY~&X
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if((l-i)>THRESHOLD){ BE:HO^-.1
stack[++top]=i; ; GRSe
stack[++top]=l-1; 7\rz*
} N{tNe-5
if((j-l)>THRESHOLD){ pz6fL=Xd
stack[++top]=l+1; My76]\Psh
stack[++top]=j; D^]7/w:$-
} x;99[C!$
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} V?t^ J7{'
//new InsertSort().sort(data); YbND2i
insertSort(data); U{} bx
} 9h<];
/** fl!8 \4
* @param data g[0b>r7
*/ ib0M$Y1tIS
private void insertSort(int[] data) { -{>JF
int temp; u=5&e)v3
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); {l%Of
} ,H2[["1DH
} [:
} 81O`#DfZ
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} 'mp@!@_
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