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快速排序: FyY;F;4P
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package org.rut.util.algorithm.support; +rql7D0st
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import org.rut.util.algorithm.SortUtil; bH,Jddc
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/** Th!S?{v
* @author treeroot =jG3wf*
* @since 2006-2-2 -(1e!5_-@
* @version 1.0 ltD:w{PO]
*/ ,2?C^gxt
public class QuickSort implements SortUtil.Sort{ X^@d@xU4v
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/* (non-Javadoc) pXQ&2s$
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
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*/ xt`znNN
public void sort(int[] data) { Pb~S{):
quickSort(data,0,data.length-1); cb
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} +bQn2PG=
private void quickSort(int[] data,int i,int j){ =h&^X>!
int pivotIndex=(i+j)/2; 7unu-P<C
//swap 5 wc&0h
SortUtil.swap(data,pivotIndex,j); IGI2).$[
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int k=partition(data,i-1,j,data[j]); 9ge$)q@3
SortUtil.swap(data,k,j); zR5D)`Ph
if((k-i)>1) quickSort(data,i,k-1); $/d~bk@=l
if((j-k)>1) quickSort(data,k+1,j); w]%r]PwU+
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} g.9MPN
/** pF8'S{y
* @param data vJcvyz#%1
* @param i 61C&vm
* @param j |]B]0J#_
* @return $~9U-B\
*/ (
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private int partition(int[] data, int l, int r,int pivot) { U O[p
do{ m<076O4|`
while(data[++l] while((r!=0)&&data[--r]>pivot); hA~}6Qn
SortUtil.swap(data,l,r); .t}nznh
} UbuxD })
while(l SortUtil.swap(data,l,r); 1yKf=LZ^
return l; x'
} I~mw\K{.3M
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改进后的快速排序: dk3\~m%Pv
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package org.rut.util.algorithm.support; Q2#)Jx\6!
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import org.rut.util.algorithm.SortUtil; CiMN J
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/** t71 0sWh{
* @author treeroot :)MZgW
* @since 2006-2-2 A&t}s
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* @version 1.0 )c!f J7o:
*/
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public class ImprovedQuickSort implements SortUtil.Sort { O0Z'vbFG
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private static int MAX_STACK_SIZE=4096; */S,CV
private static int THRESHOLD=10; Yhx~5p
/* (non-Javadoc) MQ,2v.
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) wDSU~\
*/ =lffr?#&B
public void sort(int[] data) { c''!&;[!
int[] stack=new int[MAX_STACK_SIZE]; D1Fc7!TV
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int top=-1; [Q%3=pm_
int pivot; "w7:{E5e
int pivotIndex,l,r; =!{dKz-&
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stack[++top]=0; "oTwMU
stack[++top]=data.length-1; J5l:_hZUV
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while(top>0){ EM([N*8o
int j=stack[top--]; ; aMMIp
int i=stack[top--]; WFh!re%Z
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pivotIndex=(i+j)/2; 8p!PR^OM@
pivot=data[pivotIndex]; :`uo]B"
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SortUtil.swap(data,pivotIndex,j); 9PGSr4V1
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//partition }ShZ4 xMz
l=i-1; MW&;{m?2(
r=j; ~o8$/%Oeb/
do{ 7aU*7!U
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ]w')~yk
SortUtil.swap(data,l,r); U}{r.MryFG
} M`5^v0,C
while(l SortUtil.swap(data,l,r); Oi{jzP
SortUtil.swap(data,l,j); eH6#'M4+\
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if((l-i)>THRESHOLD){ KpK'?WhX7^
stack[++top]=i; T[7-3[w<)
stack[++top]=l-1; *D9QwQ
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} 3W27R
if((j-l)>THRESHOLD){ sDwSEg>#B
stack[++top]=l+1; 9EH%[wfv
stack[++top]=j; V 1Fdt+#
} TQ>1u
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} N(IUNL
//new InsertSort().sort(data); DG&
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insertSort(data); gFW1Nm_DJ
} _H;ObTiB
/** &K\di*kN
* @param data R!- RSkB
*/ <4VUzgX2
private void insertSort(int[] data) { 0/*z]2
int temp; y6Rg@L&U
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); muY4:F.C(
} mH8"k+k
} a{{([uZ
} }5%!:=
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