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快速排序: ,HM~Zs
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package org.rut.util.algorithm.support; Jz6,2,LN
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import org.rut.util.algorithm.SortUtil; YKsc[~
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/** >ey-j\_v
* @author treeroot hu+% X.F4
* @since 2006-2-2 lm;G8IP`
* @version 1.0 ~
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*/ 19t'
public class QuickSort implements SortUtil.Sort{ AE"E($S`
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/* (non-Javadoc) ?nAKB5=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3qc o2{nz
*/ P7iU_CgyW
public void sort(int[] data) { gwepaW
quickSort(data,0,data.length-1); eZWR)+aq
} {?dW-
private void quickSort(int[] data,int i,int j){ `i)&nW)R
int pivotIndex=(i+j)/2; |ozlaj
//swap uJ! yM;{+
SortUtil.swap(data,pivotIndex,j); wzRIvm{
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int k=partition(data,i-1,j,data[j]); 9w! G
SortUtil.swap(data,k,j); eL+L
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if((k-i)>1) quickSort(data,i,k-1); nE)|6
if((j-k)>1) quickSort(data,k+1,j); 0w_2E
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} U@$=0*
/** I2wT]L UV
* @param data 'Na/AcRdg
* @param i .{|AHW&0<
* @param j !cWnQRIt_F
* @return j>0~"A
*/ 9#;UQ.qA
private int partition(int[] data, int l, int r,int pivot) { igW>C2J
do{ |e@Bi#M[
while(data[++l] while((r!=0)&&data[--r]>pivot); 6v9{$:
SortUtil.swap(data,l,r); $Di2BA4Di
} Y%V|M0 0`
while(l SortUtil.swap(data,l,r); d">Ya !W
return l; 9$xEktfV
} plY`lqm
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} '*KP{"3\
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改进后的快速排序: M\s^>7es
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package org.rut.util.algorithm.support; ~"*;lT5KX
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import org.rut.util.algorithm.SortUtil; r]=3aebR.
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/** kPVP+}cA
* @author treeroot .F~EQ %
* @since 2006-2-2 cg,_nG]i
* @version 1.0 e<p_u)m
*/ S %"7`xl
public class ImprovedQuickSort implements SortUtil.Sort { )pVxp]EI
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private static int MAX_STACK_SIZE=4096; i`g>Y5
private static int THRESHOLD=10; N[$(y}
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/* (non-Javadoc) bz~-uHC
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _l?5GLl_F$
*/ f-\l<o(
public void sort(int[] data) { DOXRU5uP3
int[] stack=new int[MAX_STACK_SIZE]; ~~ON!l9n
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int top=-1; Lh &L5p7
int pivot; c3lfmTT6^
int pivotIndex,l,r; |yI?}zyR
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stack[++top]=0; Oz9k.[j(
stack[++top]=data.length-1; ;e0>.7m
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while(top>0){ r,6~?hG]
int j=stack[top--]; EMH?z2iGd
int i=stack[top--]; !UUh7'W4u
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pivotIndex=(i+j)/2; IEzZ$9,A5
pivot=data[pivotIndex]; <MN+2^ed&
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SortUtil.swap(data,pivotIndex,j); 0nAeeVz|
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//partition T^GdN_qF
l=i-1; _<.R \rX&
r=j; q<JI!n1O
do{ y|KDh'Y
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ^d"tymDd
SortUtil.swap(data,l,r); #%e`OA(b
} a~ REFy
while(l SortUtil.swap(data,l,r); [jumq1
SortUtil.swap(data,l,j); B>47Ic
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if((l-i)>THRESHOLD){ ,)L.^<
stack[++top]=i; $)@zlnU
stack[++top]=l-1; HIhoYSwB
} >[xQUf,p
if((j-l)>THRESHOLD){ I{cn ,,8
stack[++top]=l+1; ecf7g)+C
stack[++top]=j; xDr
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} zMrZ[AU
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} xs &vgel>
//new InsertSort().sort(data); ,75,~
insertSort(data); l!i B
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} kd\yHI9A
/** Mdwh-Cis/
* @param data !s)2H/KM 8
*/ $]81 s`
private void insertSort(int[] data) { &8&WY1cU
int temp; NHc+QMbou(
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 6-X7C9`C
} N&>D/Z;"
} QW2% Gv:
} \iVYhl
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} w\t{'
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