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快速排序: -wp|RD,}(
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package org.rut.util.algorithm.support; FKIw!m ~
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import org.rut.util.algorithm.SortUtil; 5*j?E
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/** 3 jGWkby0
* @author treeroot @LS@cCC,a
* @since 2006-2-2 /RNIIY~w
* @version 1.0 kW*f.!
*/ RX>xB
public class QuickSort implements SortUtil.Sort{ dYG,_ji
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/* (non-Javadoc) @Fluc,Il
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) `7 vHt`
*/ B|R@5mjm
public void sort(int[] data) { ZjgsR|i
quickSort(data,0,data.length-1); I%r{]-Obr-
} !F1M(zFD
private void quickSort(int[] data,int i,int j){ >[9J?H
int pivotIndex=(i+j)/2; 9{(.Il J>
//swap o^^rJk
SortUtil.swap(data,pivotIndex,j); 9f2UgNqe9
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int k=partition(data,i-1,j,data[j]); >hPQRd
SortUtil.swap(data,k,j); SO IHePmwK
if((k-i)>1) quickSort(data,i,k-1); fI{E SXU
if((j-k)>1) quickSort(data,k+1,j); Rtb7|
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} f({Ei`|
/** [NaN>BZ?
* @param data T;L>;E>B
* @param i !zkZQ2{Wn
* @param j u -;_y='m
* @return d*jMZ%@uS
*/ ]QpWih00V
private int partition(int[] data, int l, int r,int pivot) { I/&%]"[^u
do{ E8pB;\Z(
while(data[++l] while((r!=0)&&data[--r]>pivot); Gcdd3W`O
SortUtil.swap(data,l,r); .} q&5v
} 6HZ` .o:f
while(l SortUtil.swap(data,l,r); |_] Q$q[[%
return l; H=g`hF]`
} G+%zn|
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} \!k1a^ZP
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改进后的快速排序: {>R:vH8
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package org.rut.util.algorithm.support; v-#Q7T
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import org.rut.util.algorithm.SortUtil; %K>,xiD)
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/** ,{BaePMp
* @author treeroot s!?`T1L
* @since 2006-2-2 ?98("T|y;
* @version 1.0 ~rDZ?~%
*/ AfX}y+Ah
public class ImprovedQuickSort implements SortUtil.Sort { ,u+PyG7 cb
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private static int MAX_STACK_SIZE=4096; xD5:RE~g
private static int THRESHOLD=10; L\@I*QP
/* (non-Javadoc) jzDuE{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) d Vj_8>
*/ eO?p*"p" F
public void sort(int[] data) { Fx;QU)1l3
int[] stack=new int[MAX_STACK_SIZE]; )6q,>whI]
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int top=-1; l8I /0`_
int pivot; swK-/$#
int pivotIndex,l,r; F({HP)9b
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stack[++top]=0; ]^lw*724'>
stack[++top]=data.length-1; }% `.h"
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while(top>0){ zG ^$"f2
int j=stack[top--]; P(H8[ ,
int i=stack[top--]; 7*
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pivotIndex=(i+j)/2; v.pBX<
pivot=data[pivotIndex]; tnPv70m
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SortUtil.swap(data,pivotIndex,j); t=Xv;=daB
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//partition E%rk[wI
l=i-1; ;$smH=I
r=j; M_"L9^^>N
do{ q1QL@Ax
while(data[++l] while((r!=0)&&(data[--r]>pivot)); \P.I)n`8 y
SortUtil.swap(data,l,r); l038%U~U!
} h| ,:e;>}
while(l SortUtil.swap(data,l,r); rEB@$C^
SortUtil.swap(data,l,j); P(+&OoY2
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if((l-i)>THRESHOLD){ <eQj`HL
stack[++top]=i; \Ta"}TF8
stack[++top]=l-1; 7]blrN]
} ~/98Id}v
if((j-l)>THRESHOLD){ L3@82yPo!
stack[++top]=l+1; nm6h%}xND<
stack[++top]=j; ~]nSSD)\
} ;1%-8f:lW
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} y%%}k
//new InsertSort().sort(data); )}"wesNo".
insertSort(data); _#r+ !e
} A-ZN F4
/** VU&7P/\f%
* @param data U<DZ:ds?T
*/ thifRd$4
private void insertSort(int[] data) { %= fHu+
int temp; yXHUJgjl/
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); L*&p!
} :I+Gu*0WD
} G/7cK\^u
} ?d{Na=O\
P} 0%-JC
} mt,OniU= Q
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