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快速排序: %B#Ewt@[
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package org.rut.util.algorithm.support; &oNy~l
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import org.rut.util.algorithm.SortUtil; }1'C!]j
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/** v!40>[?|p
* @author treeroot S[* e K
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* @since 2006-2-2 .lRO;D
* @version 1.0 y8
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*/ =@B9I<GKf
public class QuickSort implements SortUtil.Sort{ ()XL}~I{!A
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/* (non-Javadoc) t?{E_70W
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) kvryDM
*/ r?V\X7` +
public void sort(int[] data) { U9kt7#@FDK
quickSort(data,0,data.length-1); fz,8 <
} 3+Xz5>"a
private void quickSort(int[] data,int i,int j){ Q +qN`
int pivotIndex=(i+j)/2; 2<U5d`
//swap ~vG~Z*F
SortUtil.swap(data,pivotIndex,j); O8n\>p kI
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int k=partition(data,i-1,j,data[j]); `/0X].s#o
SortUtil.swap(data,k,j); 'ApWYt
if((k-i)>1) quickSort(data,i,k-1); FWPkvL
if((j-k)>1) quickSort(data,k+1,j); #2Mz.=#G
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}
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/** 82>zu}
* @param data ~pwp B2c
* @param i 7nfQ=?XNK
* @param j =7#)8p[
* @return b\H~Ot[i
*/ |jc87(x<
private int partition(int[] data, int l, int r,int pivot) { AVHn7olG
do{ Kkdd }j
while(data[++l] while((r!=0)&&data[--r]>pivot); L,Uqt,
SortUtil.swap(data,l,r); ~h0SD(
} u'LA%l-
while(l SortUtil.swap(data,l,r); HL*jRl
return l; CEZ*a 0}=
} aRg-
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} !!dNp5h`
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改进后的快速排序: Ij/c@#q.
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package org.rut.util.algorithm.support; Nqewtn9n
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import org.rut.util.algorithm.SortUtil; =<R77rnY&
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/** W<k) '|
* @author treeroot qDNqd
* @since 2006-2-2 KZ;U6TBiB
* @version 1.0 aFd
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*/ <86upS6
public class ImprovedQuickSort implements SortUtil.Sort { 2"JIlS;J}7
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private static int MAX_STACK_SIZE=4096; ; #e-pkV
private static int THRESHOLD=10; r'k-*I
/* (non-Javadoc) !dSY?1>U<
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) f4]nz:2
*/ ^MDBJ0
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public void sort(int[] data) { ) Q]kUG#`
int[] stack=new int[MAX_STACK_SIZE]; ;. /Tv84I^
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int top=-1; \O72PC+
int pivot; }JAg<qy}
int pivotIndex,l,r; JzCfs<D
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stack[++top]=0; ] E`J5o}op
stack[++top]=data.length-1; Qx'a+kLu9
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while(top>0){ Yq3(,
int j=stack[top--]; rsy'ZVLUj
int i=stack[top--]; n"d~UV^Uw
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pivotIndex=(i+j)/2; 4|7L26,]5
pivot=data[pivotIndex]; N{
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SortUtil.swap(data,pivotIndex,j); DJT)7l {
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//partition !Kd/
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l=i-1; *+lnAxRa?
r=j; @ U:WWTzf
do{ sw8Ic\vT
while(data[++l] while((r!=0)&&(data[--r]>pivot)); wzT+V,
SortUtil.swap(data,l,r); __'Z0?.4#
} +#,t
while(l SortUtil.swap(data,l,r); auaFP-$`f
SortUtil.swap(data,l,j); ZXe[>H
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if((l-i)>THRESHOLD){ 2mVH*\D
stack[++top]=i; i#iY;R8
stack[++top]=l-1; !5Z?D8dcx
} Su6ZO'[)
if((j-l)>THRESHOLD){ :G,GHU'/78
stack[++top]=l+1; H[fD
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stack[++top]=j; u;J9aKD
} 6D_4o&N
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} j?3J-}XC
//new InsertSort().sort(data); ?^5W.`Y2i
insertSort(data); ps_CQh0
} ib*$3Fn~
/** 5/>G)&
* @param data W>/O9?D
*/ yV=hi?f-[V
private void insertSort(int[] data) { R-bICGSE
int temp; ^7~=+0cF]
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 82efqzT
} W^P%k:anK
} .@ /5Ln
} ?(;ygjyx
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} %t:1)]2
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