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快速排序: P:yMj&)
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package org.rut.util.algorithm.support; {'#^
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import org.rut.util.algorithm.SortUtil; <t0o{}^P*
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/** ?5!>k^q
* @author treeroot %maLo RJ
* @since 2006-2-2 ;yO7!{_
* @version 1.0 +<P%v k
*/ ')/yBH9mR
public class QuickSort implements SortUtil.Sort{ g2WDa'{L
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/* (non-Javadoc) VL/%D*
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) fK|F`F2V
*/ *gC6yQ2?
public void sort(int[] data) { 6A]Ia4PL
quickSort(data,0,data.length-1); :8bz+3p
} S5Q$dAL
private void quickSort(int[] data,int i,int j){ {uRnZ/m
int pivotIndex=(i+j)/2; YRYAQj/7
//swap cM;&$IjCt
SortUtil.swap(data,pivotIndex,j); ^L(}c O
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int k=partition(data,i-1,j,data[j]); "$tP>PO{<
SortUtil.swap(data,k,j); L;0ZB=3n
if((k-i)>1) quickSort(data,i,k-1); X|F([,o
if((j-k)>1) quickSort(data,k+1,j); 'o2x7~C@
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} p`3pRrER
/** }w&+H28.#
* @param data el*C8TWlw
* @param i 37@_"
* @param j Q2)z1'Wv
* @return i!30f^9D-S
*/ :*"0o{
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private int partition(int[] data, int l, int r,int pivot) { 4#Fz!Km
do{ ruLi
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while(data[++l] while((r!=0)&&data[--r]>pivot); KF|<A@V
SortUtil.swap(data,l,r); ]3C&l+m$ot
} X'Dg= |
while(l SortUtil.swap(data,l,r); EF?@f{YY$n
return l; EwcN$Ma
} 4w:_4qyb
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} HKk;oG
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改进后的快速排序: Y
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package org.rut.util.algorithm.support; sV/#P<9
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import org.rut.util.algorithm.SortUtil; I%43rdoPe
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/** *ws!8-)fH
* @author treeroot ;N4b~k)
* @since 2006-2-2 y8Bi5Ae,+1
* @version 1.0 }MDu QP]
*/ ->x+ p"
public class ImprovedQuickSort implements SortUtil.Sort { is%qG?,P
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private static int MAX_STACK_SIZE=4096; dwKre#4F
private static int THRESHOLD=10; iXc-_V6
/* (non-Javadoc) QW.VAF\6*
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) k, )7v
*/ ANy=f-V
public void sort(int[] data) { h5G>FPM-=
int[] stack=new int[MAX_STACK_SIZE]; SxYX`NQ
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int top=-1; CE>RAerY
int pivot; sT9P
int pivotIndex,l,r; #_}lF<k
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stack[++top]=0; nKJJ7'$'3
stack[++top]=data.length-1; N0GID-W!/~
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while(top>0){ Dcq\1V.e`W
int j=stack[top--]; BW}^ n
int i=stack[top--]; M=$y_9#
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pivotIndex=(i+j)/2; O^I~d{M 5I
pivot=data[pivotIndex]; ,qak_bP
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SortUtil.swap(data,pivotIndex,j); d{@X-4k:
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//partition pO$`(+q[
l=i-1; . \*Z:
r=j; kDJ5x8Q#
do{ t$8f:*6(*
while(data[++l] while((r!=0)&&(data[--r]>pivot)); _cx}e!BK#
SortUtil.swap(data,l,r); 12aAO|]/~
} >~I~!i3
while(l SortUtil.swap(data,l,r); |<\LB
SortUtil.swap(data,l,j); KUVsCmiT
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if((l-i)>THRESHOLD){ J4h7]
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stack[++top]=i; `,4"[6S
stack[++top]=l-1; .
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} Pv{ {zyc
if((j-l)>THRESHOLD){ =*qu:f\y
stack[++top]=l+1; vbmSbZ"y
stack[++top]=j; 0 ]U
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} _d&zHlc_
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} O B8fFd
//new InsertSort().sort(data); 'MPt K
insertSort(data); 8zGe5Dn9
} 'i_od|19~h
/** k/O|ia6
* @param data =Z iyT$p
*/ ;g: TsYwM
private void insertSort(int[] data) { &F[/@
int temp; 3x9O<H}
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); V<
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} }-k<>~FA
} @0?Mwy!
} |cJyP9}n
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} |x2>F
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