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快速排序: ^Ej$o@PH
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package org.rut.util.algorithm.support; %"-bG'Yc
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import org.rut.util.algorithm.SortUtil; Ln:6@Ok)5%
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/** A12EUr5$
* @author treeroot 5. ibH
* @since 2006-2-2 F
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* @version 1.0 XSk*w'xO
*/ 2[|52+zhc
public class QuickSort implements SortUtil.Sort{ =mR~\R(
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/* (non-Javadoc) L $L/5/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) yPY}b_W
*/ '8%jA$o\g
public void sort(int[] data) { ;)~}/nR<a
quickSort(data,0,data.length-1); =LXjq~p
} 8tfM,.]_i
private void quickSort(int[] data,int i,int j){ '41'Gn
int pivotIndex=(i+j)/2; .3
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//swap Kzw br?&z
SortUtil.swap(data,pivotIndex,j); a+'k#m
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int k=partition(data,i-1,j,data[j]); a-e_ q
SortUtil.swap(data,k,j); "I)/|x\G*
if((k-i)>1) quickSort(data,i,k-1); u7&q(Z&&O
if((j-k)>1) quickSort(data,k+1,j); +YZ*>ki
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} yY[9\!
/** q QcQnd2K
* @param data Fn>KdoByN
* @param i )<Fq}Q86
* @param j 4)"S/u
* @return Zd5Jz+f
*/ 'tTUro1~
private int partition(int[] data, int l, int r,int pivot) { ~c,CngeL0
do{ -pmb-#`M
while(data[++l] while((r!=0)&&data[--r]>pivot); Gj_7wP$
SortUtil.swap(data,l,r); ^H"o=K8=
} vB74r]'F
while(l SortUtil.swap(data,l,r); r>: ~!o*
return l; y1{TVpN
} {W+IUvn
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} KH$|wv
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改进后的快速排序: JBhM*-t(M1
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package org.rut.util.algorithm.support; IOA2/WQu
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import org.rut.util.algorithm.SortUtil; |kY}G3/
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/** 7|5X> yt
* @author treeroot Ii9[[I
* @since 2006-2-2 nw4I<Q
* @version 1.0 <%o9*)F
*/ dGyrzuPJ
public class ImprovedQuickSort implements SortUtil.Sort { K| dI'TnW
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private static int MAX_STACK_SIZE=4096; Gv[s86AP,
private static int THRESHOLD=10; 1rx,qfCq
/* (non-Javadoc) 2&"qNpPtE
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) xi51,y+(5
*/ y'aK92pF:
public void sort(int[] data) { },n?
int[] stack=new int[MAX_STACK_SIZE]; q9:g
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int top=-1; =oBlUE
int pivot; rD+mI/_J`
int pivotIndex,l,r; V7b;qC'
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stack[++top]=0; Q,K$)bM
stack[++top]=data.length-1; ({ O~O5k
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while(top>0){ (xfh 9=.
int j=stack[top--]; V/3@iOwD
int i=stack[top--]; qnCjNN
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pivotIndex=(i+j)/2; He,,bq
pivot=data[pivotIndex]; e)= "Fq!
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SortUtil.swap(data,pivotIndex,j); qJ sH
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//partition It7R}0Smg
l=i-1; X n8&&w"
r=j; SRtw
do{ Jz}`-fU`
while(data[++l] while((r!=0)&&(data[--r]>pivot)); VKkvf"X
SortUtil.swap(data,l,r); c]h@<wnv
} 0SfW:3
while(l SortUtil.swap(data,l,r); B0U(B\~Y
SortUtil.swap(data,l,j); &wAVO_s
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if((l-i)>THRESHOLD){ m/Erw"Z
stack[++top]=i; ^U5Qb"hz
stack[++top]=l-1; "~=-Q#xO
} V@g v
if((j-l)>THRESHOLD){ [YP{%1*RM
stack[++top]=l+1; /ej[oR
stack[++top]=j; NVghkd
} CY*o"@-o5)
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} iO&*WIbg
//new InsertSort().sort(data); #i.,+Q
insertSort(data); ,PmUl=
} Nc&J%a
/** (H5#r2h%Y
* @param data ,{mv6?_
*/ m}u)C&2>
private void insertSort(int[] data) { q}+zNeC
int temp; _1Q6FI5iR
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); IMr#5
} F^$;hMh%
} n$N$OFuO
} {nXygg
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} LPBa!fq
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