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快速排序: -wNhbV2
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package org.rut.util.algorithm.support; CJ#Yu3}
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import org.rut.util.algorithm.SortUtil; la]Zk
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/** (15.?9
* @author treeroot NB( GE
* @since 2006-2-2 '$ G%HUn
* @version 1.0 9N) Ea:N
*/ V|nJ%G\
public class QuickSort implements SortUtil.Sort{ xFp9H'j{
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/* (non-Javadoc) A/j'{X!z
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1ahb:Mjv
*/ XFww|SG$
public void sort(int[] data) { $uK[[k~=S
quickSort(data,0,data.length-1); E`iE]O
} W%9"E??c
private void quickSort(int[] data,int i,int j){ 5(Xq58nhxI
int pivotIndex=(i+j)/2; gJ$m'kC;
//swap 5y~B/.YY
SortUtil.swap(data,pivotIndex,j); 1py>[II@
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int k=partition(data,i-1,j,data[j]); z KG]7
SortUtil.swap(data,k,j); gvP.\,U
if((k-i)>1) quickSort(data,i,k-1); PC!X<C8*
if((j-k)>1) quickSort(data,k+1,j); U/rFH9e$
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} b&pL}o?/k
/** ]U 1S?p
* @param data +gb"}
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* @param i &23t/`
* @param j VOp+6ho<
* @return ve(@=MJ
*/ e#tWQM3
private int partition(int[] data, int l, int r,int pivot) { ZQ#AE VI,
do{ cW^u4%f't'
while(data[++l] while((r!=0)&&data[--r]>pivot); 3+D4$Y"
SortUtil.swap(data,l,r); |q_Hiap#a
} %B Rll
while(l SortUtil.swap(data,l,r); 6b4]dvl_
return l; elP#s5l4
} :Ui'x8yt
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} M;@/697G
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改进后的快速排序: Xkp`1UTH
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package org.rut.util.algorithm.support; 0Jm)2@
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import org.rut.util.algorithm.SortUtil; +n<;);h
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/** 0:>C v<N
* @author treeroot Yp9%u9tNq
* @since 2006-2-2 bLz('mUY
* @version 1.0 v,c:cKj
*/ `%0k\,}V
public class ImprovedQuickSort implements SortUtil.Sort { t~]tw
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private static int MAX_STACK_SIZE=4096; >vQKCc|93
private static int THRESHOLD=10; =,W~^<\"
/* (non-Javadoc) 8';huq@C{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) /KCIb:U
*/ JB!KOzw
public void sort(int[] data) { _We4%
int[] stack=new int[MAX_STACK_SIZE]; 6J\A%i
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int top=-1; T7XbbU
int pivot; D4QLlP
int pivotIndex,l,r; ZL- ` 3x
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stack[++top]=0; 1Q??R}
stack[++top]=data.length-1; +0n,>eDjg^
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while(top>0){ C;rK16cn
int j=stack[top--]; xo(3<1mD
int i=stack[top--]; p/&s-GF
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pivotIndex=(i+j)/2; ]4-t*Em
pivot=data[pivotIndex]; ~2U5Wt
)%(H'omvl
SortUtil.swap(data,pivotIndex,j); TZ@S?r>^
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//partition TZS:(MJ9M
l=i-1; N< 7
r=j; ::G0v
do{ 7
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); >`.$Tyw
SortUtil.swap(data,l,r); 2lBfc
} $PKUcT0N9
while(l SortUtil.swap(data,l,r); Y\7/`ty
SortUtil.swap(data,l,j); aboA9pwH
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if((l-i)>THRESHOLD){ *Y9' tHI
stack[++top]=i; MG0d&[
stack[++top]=l-1; ^o6&|q
} {FNq&)#`
if((j-l)>THRESHOLD){ r*4@S~;
stack[++top]=l+1; [5jXYqD=vj
stack[++top]=j; 1FmqNf:V7I
} Ng<oz*>U
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} tY$4k26
//new InsertSort().sort(data); }h_=
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insertSort(data); LDq(WPI1#
} nM&UdKf3
/** ,L7:3W
* @param data bmGtYv
*/ GxcW^{;
private void insertSort(int[] data) { 5_Opx=
int temp; ALnE[}N6,
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 5Lm<3:7Q+
} 3r,^is
} c9N5c
} V(6ovJpA0
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} 5 iP{)
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