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快速排序: Q? qjWZY
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package org.rut.util.algorithm.support; R3?:\d{
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import org.rut.util.algorithm.SortUtil; dQai4e>[
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/** q@%h^9.
* @author treeroot LP ,9<&"<
* @since 2006-2-2 o_O+u%y
* @version 1.0 @HvScg*Y
*/ b_vVB`>
public class QuickSort implements SortUtil.Sort{ ge$LIsE8
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/* (non-Javadoc) }'TTtV:Q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ?gN9kd)
*/ Mb/L~gd"
public void sort(int[] data) { 7 W{~f?Sh
quickSort(data,0,data.length-1); S*g`d;8gV
} %9X{{_
private void quickSort(int[] data,int i,int j){ g#qNHR
int pivotIndex=(i+j)/2; 6b<+8w
//swap [fxuUmU
SortUtil.swap(data,pivotIndex,j); Pcdf$a"`
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int k=partition(data,i-1,j,data[j]); <BPRV> 0X
SortUtil.swap(data,k,j); (f~gEKcB2u
if((k-i)>1) quickSort(data,i,k-1);
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if((j-k)>1) quickSort(data,k+1,j); d&u7]<yDA
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} s^cc@C
/** Yx),6C3
* @param data sB6dpD
* @param i b=1%pX_
* @param j Fu%X
* @return *NlpotW,f
*/ +T2HE\
private int partition(int[] data, int l, int r,int pivot) { sT`^ljp4
do{ ?'wsIH]m
while(data[++l] while((r!=0)&&data[--r]>pivot); 4\6:\
SortUtil.swap(data,l,r); k"
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} 4P%m>[
while(l SortUtil.swap(data,l,r); )* TF"
return l; Sl>>SP
} Q]rqD83((
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改进后的快速排序: +j[`,5oS
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package org.rut.util.algorithm.support; Q0~j$Jc
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import org.rut.util.algorithm.SortUtil; <GF @L
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/** Uo6(|mm
* @author treeroot `G?qY8
* @since 2006-2-2 n+;vjVS%
* @version 1.0 jK3\K/ob(
*/ \zu}\{
public class ImprovedQuickSort implements SortUtil.Sort { hD
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private static int MAX_STACK_SIZE=4096; `f)(Y1%.
private static int THRESHOLD=10; ntGq"
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/* (non-Javadoc) ZJ(rG((!
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) tg 85:
*/ .X
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public void sort(int[] data) { B1$ikY
int[] stack=new int[MAX_STACK_SIZE]; 73
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int top=-1; *eUc.MX6x
int pivot; VT=K"`EpQ
int pivotIndex,l,r; &U"X$aFc
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stack[++top]=0; n"G`b
stack[++top]=data.length-1; t1ze-Ht;
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while(top>0){ {QQl$ys/
int j=stack[top--]; ai;\@$ cq
int i=stack[top--]; M35Ax],:^
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pivotIndex=(i+j)/2; ?QpNjsF
pivot=data[pivotIndex]; (oaYF+T
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SortUtil.swap(data,pivotIndex,j); {'R)4hL
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//partition 8S
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l=i-1; "&QH6B1U6H
r=j; 7=k^M, a
do{ :a3xvN-l
while(data[++l] while((r!=0)&&(data[--r]>pivot)); k+1gQru{d
SortUtil.swap(data,l,r); Gt~JA0+C)7
} {1~T]5
while(l SortUtil.swap(data,l,r); <KQ(c`KW7
SortUtil.swap(data,l,j); @Zm Jz
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if((l-i)>THRESHOLD){ 8eyl,W=dn
stack[++top]=i; u^4h&fL
stack[++top]=l-1; V'StvU
} ^Mytp> 7
if((j-l)>THRESHOLD){ lf$Ve
stack[++top]=l+1; nvyB/
stack[++top]=j; g`?:=G:a*
} *H2]H@QHN
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} _H\<[-l
//new InsertSort().sort(data); Cs1>bpY*R6
insertSort(data); YYUe)j{T
} <z) E(J\
/** g}Qx`65:
* @param data \=nrt?
*/ T+CajSV
private void insertSort(int[] data) { Vb)zZ^va+
int temp; WzlC*iv
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); Ceg!w#8 Z,
} +>YfRqz:KB
} &]iKriG
} bd \=h1
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} VKrShI
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