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快速排序: -^xbd_'
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package org.rut.util.algorithm.support; @&ZQDi
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import org.rut.util.algorithm.SortUtil; 5G f@n/M"
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/**
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* @author treeroot RRIh;HhX
* @since 2006-2-2 cKt=?
* @version 1.0 CF '&Yo
*/ ^viabkf C
public class QuickSort implements SortUtil.Sort{ gc.Lh~
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/* (non-Javadoc) VVas>/0qr
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ec&/a2M
*/ $a M5jH<
public void sort(int[] data) { f4"UI-8;n
quickSort(data,0,data.length-1); :RIz6Tz
} b6N[t _,
private void quickSort(int[] data,int i,int j){ S(zp_
int pivotIndex=(i+j)/2; ;Bs~E
//swap h1w({<q*ov
SortUtil.swap(data,pivotIndex,j); l6/VJ~(}'
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int k=partition(data,i-1,j,data[j]); 1!<t8,W4
SortUtil.swap(data,k,j); @8|*Ndx2
if((k-i)>1) quickSort(data,i,k-1); ^+_rv
if((j-k)>1) quickSort(data,k+1,j); |C[!A
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} vYed_'_
/** !D#"+&&G8
* @param data uuC ["Z
* @param i =,6H2ew
* @param j MiT0!6Pg
* @return Ie.*x'b?y
*/ AW]\n;f
private int partition(int[] data, int l, int r,int pivot) { D=0YLQ*rP
do{ O3} JOv_
while(data[++l] while((r!=0)&&data[--r]>pivot); EwC]%BZP
SortUtil.swap(data,l,r); ?QOU9"@+B
} `q?3ux
while(l SortUtil.swap(data,l,r); PI9,*rOy
return l; {&=+lr_h?
} YB 38K(
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} xyp{_ MZ
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改进后的快速排序: paqGW]
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package org.rut.util.algorithm.support; Jo5B mh0
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import org.rut.util.algorithm.SortUtil; @/z\p7e
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/** v(1 [n]y
* @author treeroot H;/do-W[
* @since 2006-2-2 Mog>W&U
* @version 1.0 `6Bx8CZ'I
*/ *~vB6V|1
public class ImprovedQuickSort implements SortUtil.Sort { Er;/zxg9p
%{u@{uG0'3
private static int MAX_STACK_SIZE=4096; nip6|dN
private static int THRESHOLD=10; RM;a]g*
/* (non-Javadoc) g#5R||r
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) (` *BZ_
*/ 1'~Xn
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public void sort(int[] data) { 7v5]%%E/
int[] stack=new int[MAX_STACK_SIZE]; >q"dLZ
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int top=-1; {VcRur}&Y8
int pivot; =zkN63S
int pivotIndex,l,r; n'~==2
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stack[++top]=0; ~gDYb#p
stack[++top]=data.length-1; &dyQ6i$],
,!#Am13
while(top>0){ vpQ&vJfR
int j=stack[top--]; /ZvP.VW&
int i=stack[top--]; O~3
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pivotIndex=(i+j)/2; i2=- su
pivot=data[pivotIndex]; pY31qhoZ.
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SortUtil.swap(data,pivotIndex,j); Sdu\4;(
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//partition bb6x} jR
l=i-1; bMO^}qR`
r=j; YYWD\Y`8
do{ k@4N7}
while(data[++l] while((r!=0)&&(data[--r]>pivot)); F&d!fEHU
SortUtil.swap(data,l,r); @8L5UT
} M\]lNQ A
while(l SortUtil.swap(data,l,r); Y%KowgP\
SortUtil.swap(data,l,j); %7#<K\])
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if((l-i)>THRESHOLD){ %_(vSpk
stack[++top]=i; B)0/kY7c
stack[++top]=l-1; [l}H:%O,
} ;_<~9;
if((j-l)>THRESHOLD){ tOIqX0dWd
stack[++top]=l+1; on_h'?2
stack[++top]=j; *u},(4Qf
} 'OY4Q'Z
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} )U&9d
//new InsertSort().sort(data); 67j kU!
insertSort(data); ^ja]e%w#
} yXNr[7
/** y``\^F
* @param data dbf<k%i6
*/ c8uaZvfW
private void insertSort(int[] data) { _2fW/U54_
int temp; ..N6]u
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 6.@.k
} M':-f3aT%
} V:\:[KcL^
} `B%%2p&
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} wm5&5F4:
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