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快速排序: B51kV0
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package org.rut.util.algorithm.support; RA],lNs
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import org.rut.util.algorithm.SortUtil; QC0!p"
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/** '4OcZ/oI
* @author treeroot #fs|BV
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* @since 2006-2-2 {%.Lk'#9
* @version 1.0 4KI [D{
*/
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public class QuickSort implements SortUtil.Sort{ pi5GxDA]
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/* (non-Javadoc) ]h!`IX
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) NQ|xM"MqD
*/ z[#Fog
public void sort(int[] data) { r]P, 9
quickSort(data,0,data.length-1); $P:
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} ukuo:P<a
private void quickSort(int[] data,int i,int j){ Jqr)V2Y
int pivotIndex=(i+j)/2; _M,lQ~
//swap ciMM^ZRIb
SortUtil.swap(data,pivotIndex,j); D H^T x
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int k=partition(data,i-1,j,data[j]); u/Fj'*M
SortUtil.swap(data,k,j); V&Mf:@y
if((k-i)>1) quickSort(data,i,k-1); PfG`C5
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if((j-k)>1) quickSort(data,k+1,j); yPu4T6Vv
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} u>.y:>
/** {13!vS%5
* @param data ~S; Z\
* @param i ,xths3.K
* @param j uXQ >WI@eF
* @return 9.M{M06;
*/ $R^AEa7
private int partition(int[] data, int l, int r,int pivot) { :Dl%_l
do{ +&ZX$
while(data[++l] while((r!=0)&&data[--r]>pivot); Vf-5&S&9
SortUtil.swap(data,l,r); Psa@@'w
} 7;LO2<|1
while(l SortUtil.swap(data,l,r); uCzii o`S
return l; |G=[5e^s[
} AxCI 0
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} ';RI7)<
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改进后的快速排序: (paf2F`~#
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package org.rut.util.algorithm.support; q42FPq
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import org.rut.util.algorithm.SortUtil; ~!+h?[miV
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/** mVm4fHEYwU
* @author treeroot [@{0o+.]'H
* @since 2006-2-2 zTCP)x
* @version 1.0 MV+i{]
*/ ,EhVSrh)_4
public class ImprovedQuickSort implements SortUtil.Sort { BSXdvI1y
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private static int MAX_STACK_SIZE=4096;
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private static int THRESHOLD=10; WOndE=(V
/* (non-Javadoc) 17py).\
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ]b[,LwB\`~
*/ 85>S"%_
public void sort(int[] data) { JmWR{du
int[] stack=new int[MAX_STACK_SIZE]; 2mJ:c
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int top=-1; (iDBhC;/B
int pivot; ^o%_W0_r
int pivotIndex,l,r; Hbr^vYs5
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stack[++top]=0; hhq$g{+[
stack[++top]=data.length-1; e`DsP8-&v
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while(top>0){ sX'U|)/pD
int j=stack[top--]; :{CFTc5:A
int i=stack[top--]; MTB@CP!u
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pivotIndex=(i+j)/2; Ff/Ig]Lb
pivot=data[pivotIndex]; ZDlu1>Q
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SortUtil.swap(data,pivotIndex,j); A c:\c7M;
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//partition j6X LyeG7
l=i-1; RV]a%mVlM
r=j; 7x+=7,BZd
do{ , ,{6m
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); ib Ue*Z["1
SortUtil.swap(data,l,r); B/u*<k4
} ~j}J<4&OvC
while(l SortUtil.swap(data,l,r); JFJIls
SortUtil.swap(data,l,j); b3^R,6]x&