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快速排序: Vt:~q{9*k
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package org.rut.util.algorithm.support; OR~8sU
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import org.rut.util.algorithm.SortUtil; &8Cu#^3
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/** $P^q!H4D
* @author treeroot S2sQOM@
* @since 2006-2-2 N4F.Y"R$(
* @version 1.0 6xTuNE1
*/ MyJ%`@+1
public class QuickSort implements SortUtil.Sort{ {?}E^5Z*g
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/* (non-Javadoc) `yrB->|vG
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) xr4*{v
*/ 6t[+pL\b
public void sort(int[] data) { 7)`nD<j5
quickSort(data,0,data.length-1); R O+GK`J
} Lo{
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private void quickSort(int[] data,int i,int j){ S&Zm0Ku
int pivotIndex=(i+j)/2; vlmB`T
//swap qouhuH_WtJ
SortUtil.swap(data,pivotIndex,j); %Nlt H/I
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int k=partition(data,i-1,j,data[j]); ,8U&?8l
SortUtil.swap(data,k,j); snE8 K}4
if((k-i)>1) quickSort(data,i,k-1); [=6]+V83M
if((j-k)>1) quickSort(data,k+1,j); x<tb
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} =Y{(%sn
/** <\rT%f}3^
* @param data UZ\u;/}
* @param i
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* @param j _|kxY'_[8
* @return J=9FRC
*/ P{kur} T
private int partition(int[] data, int l, int r,int pivot) { /M1ob: m
do{ ;DqWh0
while(data[++l] while((r!=0)&&data[--r]>pivot); !;q&NHco
SortUtil.swap(data,l,r); _{I3i:f9X8
} +"\sc;6m.
while(l SortUtil.swap(data,l,r); fInb[
return l; 0L2 F[TN
} DR5\45v
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} o4G ?nvK-
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改进后的快速排序: T*Y~\~Jhu
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package org.rut.util.algorithm.support; a!6{:8Zi0
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import org.rut.util.algorithm.SortUtil; wN_Vfb
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/** rK' L6o
* @author treeroot EH+"~-v)ae
* @since 2006-2-2 gX@HO|.t
* @version 1.0 >?2M
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*/ '\l"
public class ImprovedQuickSort implements SortUtil.Sort { "jeb%k
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private static int MAX_STACK_SIZE=4096; Vz~{UHH6
private static int THRESHOLD=10; ?8npG]L)
/* (non-Javadoc) tU }h~&M
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) U dT*E: 6
*/ %a>&5V
public void sort(int[] data) { g1/:Q%R,
int[] stack=new int[MAX_STACK_SIZE]; l%k\JY-
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int top=-1; E:UW#S%A
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int pivot; fiK6@,
int pivotIndex,l,r; }"nItcp.1
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stack[++top]=0; x|/|jzJSX
stack[++top]=data.length-1; ?AK(|
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while(top>0){ : %lTU
int j=stack[top--]; }MJy
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int i=stack[top--]; Jj; L3S
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pivotIndex=(i+j)/2; ~qiJR`Jj
pivot=data[pivotIndex]; }*M6x;t
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SortUtil.swap(data,pivotIndex,j); J{.{f
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//partition ,`'Qi%O
l=i-1; @6Y?\Wx$w
r=j; {{$Nqn,pH
do{ %0S3V[4I
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 7x"R3
SortUtil.swap(data,l,r); 5bRJS70M
} m~iXl,r
while(l SortUtil.swap(data,l,r); 8zZvht*
SortUtil.swap(data,l,j); 3@etRd;]Kr
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if((l-i)>THRESHOLD){ G?L HmTHg
stack[++top]=i; H*d9l2,KZS
stack[++top]=l-1; hE-h`'ha`
} r<9Iof4
if((j-l)>THRESHOLD){ j@n)kPo,1
stack[++top]=l+1; k$ 4y9{
stack[++top]=j; Z+*9#!?J
} 9g9HlB&Ze
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} z6KCv(zvB
//new InsertSort().sort(data); :y'Ah#
insertSort(data); ,82S=N5V!
} A!od9W6
/** 52@C9Q,
* @param data /K+r?
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*/ rJ`!: f
private void insertSort(int[] data) { :NhO2L
int temp;
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 7o7)0l9!
} 'j`=if
} UE8kpa)cQ
} vk}n,ecl
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} dcDyK!zz"
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