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快速排序: ( ^Nz9{
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package org.rut.util.algorithm.support; +',S]Edx
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import org.rut.util.algorithm.SortUtil; W.KDVE$}f
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/** /@TF5]Ri
* @author treeroot je=a/Y=%U{
* @since 2006-2-2 'I6i,+D/q
* @version 1.0 z<XtS[ki
*/ )1`0PJoHE
public class QuickSort implements SortUtil.Sort{ w_K1]<Q*
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/* (non-Javadoc) $DaNbLV
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) r52gn(,
*/ 6mxfLlZ
public void sort(int[] data) { ; )@~
quickSort(data,0,data.length-1); _F|Ek ;y%
} (gWm,fI
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private void quickSort(int[] data,int i,int j){ 1^JS Dd
int pivotIndex=(i+j)/2; 56kI
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//swap [5Mr@f4I
SortUtil.swap(data,pivotIndex,j); ~U&AI1t+J
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int k=partition(data,i-1,j,data[j]); Cjlk
SortUtil.swap(data,k,j); ar+9\
if((k-i)>1) quickSort(data,i,k-1); x7<K<k;s
if((j-k)>1) quickSort(data,k+1,j); 0)Wltw~`&
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} X2~!(WxU F
/** =^,m` _1
* @param data N2<!}Eyu
* @param i _g"<UV*H
* @param j i2SR{e8:GF
* @return '3^'B03
*/ *_\_'@1|J)
private int partition(int[] data, int l, int r,int pivot) { Yufc{M00
do{ >e5qv(y]
while(data[++l] while((r!=0)&&data[--r]>pivot); U 0P~
SortUtil.swap(data,l,r); 1f=gYzuO)
} ":QZy8f9%
while(l SortUtil.swap(data,l,r); aHK}sr,U
return l; CryBwm
} LsU9 .
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} ZyFjFHe+
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改进后的快速排序: e^1Twz3z
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package org.rut.util.algorithm.support; D_zZXbNc
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import org.rut.util.algorithm.SortUtil; Wt~BU.
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/** JYHl,HH#z
* @author treeroot Y9XEP7
* @since 2006-2-2 Ao&"r[oJSv
* @version 1.0 YNsJZnGr8#
*/ $kp{Eg '
public class ImprovedQuickSort implements SortUtil.Sort { hZt!/?dc
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private static int MAX_STACK_SIZE=4096; ' %o#q6O
private static int THRESHOLD=10; :&."ttf=
/* (non-Javadoc) 8[{ Vu0R
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =fFP5e ['
*/ sdw(R#GE
public void sort(int[] data) { =]0&i]z[.
int[] stack=new int[MAX_STACK_SIZE]; v0.#Sl-
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int top=-1; t'k$&l}+
int pivot; 3AN/
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int pivotIndex,l,r; XUuN )i
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stack[++top]=0; bY~pc\V:`w
stack[++top]=data.length-1; PALc;"]O
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while(top>0){ 0oIe>r
int j=stack[top--]; {;6`_-As%
int i=stack[top--]; &6nWzF
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pivotIndex=(i+j)/2; \z(gqkc 6
pivot=data[pivotIndex]; ?^\|-Gr
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SortUtil.swap(data,pivotIndex,j); .U]-j\
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//partition pIqeXY
l=i-1; -PR N:'T
r=j; v mk2{f,g
do{ E+;7>ja
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ]N F[>uiW
SortUtil.swap(data,l,r); 4@ai6,<
} o0KL5].
while(l SortUtil.swap(data,l,r); ##" HF
SortUtil.swap(data,l,j); Oxd]y1
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if((l-i)>THRESHOLD){ j|#Bo:2km
stack[++top]=i; 9p(.A$
stack[++top]=l-1; ,Ko!$29[
} H"WprHe
if((j-l)>THRESHOLD){ hkQ"OsU
stack[++top]=l+1; XlR@pr6tw
stack[++top]=j; tK\~A,=
} E hMNap}5"
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} Lw>N rY(Y
//new InsertSort().sort(data); BnasI;yWb
insertSort(data); #S"nF@
} *gWwALGo5
/** $-sHWYZ
* @param data p0vVkdd
*/ ?gGHj-HYJ
private void insertSort(int[] data) { :"/d|i`T
int temp; G" "ZI$`
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); f%}xO+.s
} s?nR 4
} (<C3Vts))
} U # qK.
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} @~a%/GQ#n*
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