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快速排序: l3sL!D1u
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package org.rut.util.algorithm.support; L{hP&8$k
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import org.rut.util.algorithm.SortUtil; CvwC| AW
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/** A;t6duBDf/
* @author treeroot >f [Lb|t
* @since 2006-2-2 Zhl}X!:c?\
* @version 1.0 ,= ;d<O8
*/ ,FvBZ.4c3=
public class QuickSort implements SortUtil.Sort{ `7|\Gqy
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/* (non-Javadoc) <z3:*=!
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) S
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public void sort(int[] data) { SBnwlM"AN
quickSort(data,0,data.length-1); 87P.K Yy
} `ySmzp
private void quickSort(int[] data,int i,int j){ F d:A^]
int pivotIndex=(i+j)/2; J?\z{ ;qa
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SortUtil.swap(data,pivotIndex,j); 9/rX%
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int k=partition(data,i-1,j,data[j]); #]ZOi`;
SortUtil.swap(data,k,j); r Bv
if((k-i)>1) quickSort(data,i,k-1); KGCm@oy
if((j-k)>1) quickSort(data,k+1,j); rrGsam\.
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} n3, ?klK
/** lW! U:
* @param data \de824
* @param i &J~vXk:
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* @param j |fXwH> 'sw
* @return 0*66m:C2
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private int partition(int[] data, int l, int r,int pivot) { t'@1FA!)
do{ &8R %W"<K
while(data[++l] while((r!=0)&&data[--r]>pivot); $gsn@P>"
SortUtil.swap(data,l,r); 6Sh0%Fs
} R v61*F4
while(l SortUtil.swap(data,l,r); Dp
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return l; Xp<RGp7E
} uJ<sa;
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改进后的快速排序: vpOn0([hS
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package org.rut.util.algorithm.support; HH[b1z2D
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import org.rut.util.algorithm.SortUtil; L^: +8g
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/** ,5" vzGLJ
* @author treeroot =T$-idx1l
* @since 2006-2-2 @&;y0N1xo
* @version 1.0 M9{?gM9
*/
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public class ImprovedQuickSort implements SortUtil.Sort { O/M\Q
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private static int MAX_STACK_SIZE=4096; o0Qy?14T-
private static int THRESHOLD=10; %of#VSk
/* (non-Javadoc) '`^<*;w
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) bq3G3oAyG
*/ :.B};;N
public void sort(int[] data) { =/MAKi}g
int[] stack=new int[MAX_STACK_SIZE]; x0wy3+GZc
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int top=-1; ^YzFEu$
int pivot; 6dO )]
int pivotIndex,l,r; kK nz
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stack[++top]=0; }?xu/C
stack[++top]=data.length-1; 1,fjdd8OM;
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while(top>0){ \k;)m-0bj{
int j=stack[top--]; 5-O[(b2O
int i=stack[top--]; v|~ yIywf
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pivotIndex=(i+j)/2; CN0&uyu#4
pivot=data[pivotIndex]; \MM(w&
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SortUtil.swap(data,pivotIndex,j); +hg|!SS@5
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