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快速排序: ysGK5kFz
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package org.rut.util.algorithm.support; O6Xu/X]
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import org.rut.util.algorithm.SortUtil; #&1mc_`/
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/** h[ba$S,T
* @author treeroot z1T.\mzfX
* @since 2006-2-2 BtVuI5*h
* @version 1.0 5mnIQ~psR
*/ nI|jUD+y
public class QuickSort implements SortUtil.Sort{ ]hS4'9lD
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/* (non-Javadoc) T.`E DluG
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Pqo"~&Y|~
*/ c:>&Bg&,6T
public void sort(int[] data) { u~bk~3.I
quickSort(data,0,data.length-1); lyF~E
} vtCt6M
private void quickSort(int[] data,int i,int j){ vbmi_[,U
int pivotIndex=(i+j)/2; 9p+DAs{i
//swap CbS- Rz:
SortUtil.swap(data,pivotIndex,j); D;.-e
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int k=partition(data,i-1,j,data[j]); &}OaiTzEmc
SortUtil.swap(data,k,j); )f*&}SV
if((k-i)>1) quickSort(data,i,k-1); $*H_0w Qc
if((j-k)>1) quickSort(data,k+1,j); pLDseEr<
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} a+uSCs[C
/** ",w@_}z:
* @param data ['tGc{4
* @param i t}c ymX~
* @param j BC Jo/m
* @return QuT8(s1Q!
*/ Owo2DsT t
private int partition(int[] data, int l, int r,int pivot) { t*NZ@)>
do{ k_
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while(data[++l] while((r!=0)&&data[--r]>pivot); c/^}
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SortUtil.swap(data,l,r); W[AX?
} Kxn/@@z>u
while(l SortUtil.swap(data,l,r); |bQKymS
return l; O B_g:T
} q}*(rR9/Br
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} CJz2.yd
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改进后的快速排序: zFN:C()ig
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package org.rut.util.algorithm.support; b" 1a7
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import org.rut.util.algorithm.SortUtil; p3&/F=T;)
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/** K9njD#/
* @author treeroot ?S~HnIn
* @since 2006-2-2 dPc*!xrq
* @version 1.0 }JeGjpAcV
*/ g"EvMv&
public class ImprovedQuickSort implements SortUtil.Sort { 4&r[`gL
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private static int MAX_STACK_SIZE=4096; 9s>q4_D
private static int THRESHOLD=10; ['~3"lK^O
/* (non-Javadoc) =kp#v
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) B:\\aOEj
*/ zq>pK_WG
public void sort(int[] data) { lG I1LUo
int[] stack=new int[MAX_STACK_SIZE]; Q})x4
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int top=-1; A5S9F8Q/]
int pivot; 1p[C5j3
int pivotIndex,l,r; 64%P}On
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stack[++top]=0; [a:yKJ[
stack[++top]=data.length-1;
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while(top>0){ 'Ybd'|t{}
int j=stack[top--]; t3|If@T
int i=stack[top--]; k@L},Td
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pivotIndex=(i+j)/2; lr'h
pivot=data[pivotIndex]; !8 lG"l|,l
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SortUtil.swap(data,pivotIndex,j); DzydS=`w
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//partition ]v(8i3P84
l=i-1; 0x7F~%%2
r=j; V(I!HT5.W
do{ [=7=zV;}4
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 2BZYC5jy
SortUtil.swap(data,l,r); sD H^l)4h
} VG0Ty;bV
while(l SortUtil.swap(data,l,r); O-J;iX }
SortUtil.swap(data,l,j); GvSSi'q~B
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if((l-i)>THRESHOLD){ ajC'C!"^Ty
stack[++top]=i; W/!M
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stack[++top]=l-1; R4"*<%1
} @}eEV[Lli
if((j-l)>THRESHOLD){ +;^UxW
stack[++top]=l+1; xP#vAR
stack[++top]=j; t2skg
} !~Gx@Ro
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} O=~8+sa
//new InsertSort().sort(data); sU! h^N$
insertSort(data); 7#d>a=$h
} cyrVz4_a
/** d` %8qLIW
* @param data ^0)Mc"&{
*/ r<VZEbm)
private void insertSort(int[] data) { Oxo?\
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int temp; fFDI qX
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); O'm><a>8
} `B6*wE-|
} 7ss Y*1b
} ,I6jfXI4
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} uu ahR
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