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快速排序: V?59.TJ
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package org.rut.util.algorithm.support; 7&1~O#
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import org.rut.util.algorithm.SortUtil; chmJ|
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/** i: M*L< +
* @author treeroot .00=U;H%`
* @since 2006-2-2 qmeml_(W
* @version 1.0 uQ]]]Z(H'
*/ 6//FZ:q
public class QuickSort implements SortUtil.Sort{ Gj19KQ1G
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/* (non-Javadoc) +c8AbEewg
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Y\e]2
*/ ,/`E|eG1G
public void sort(int[] data) { C!{AnWf
quickSort(data,0,data.length-1); NS4'IR=;E!
} r`R~{;oT
private void quickSort(int[] data,int i,int j){ 2HGD{;6>v{
int pivotIndex=(i+j)/2; G7Abhb,
//swap N@*wi"Q
SortUtil.swap(data,pivotIndex,j); PT#eXS9_
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int k=partition(data,i-1,j,data[j]); /rxltF3
SortUtil.swap(data,k,j); ZoON5P>
if((k-i)>1) quickSort(data,i,k-1); cia-OVX
if((j-k)>1) quickSort(data,k+1,j); L\m !8o4
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} 'gZbNg=&[
/** M2E87w
* @param data vk)0n=
* @param i 0\Yx.\X,
* @param j ,0uo&/Y4L
* @return 4^[}]'w
*/ aaz"`,7_
private int partition(int[] data, int l, int r,int pivot) { +'['HQ)
do{ \q|7,S,5
while(data[++l] while((r!=0)&&data[--r]>pivot); (#B^Hyz!
SortUtil.swap(data,l,r); 6{ +_T
} }u-S j/K
while(l SortUtil.swap(data,l,r); Wda\a.bXT
return l; P"9@8aLB
} vDW&pF_eI>
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改进后的快速排序: ]bN&5.|
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package org.rut.util.algorithm.support; ?S@R~y0K
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import org.rut.util.algorithm.SortUtil; ;4kx >x*H
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/** )y`TymM[F
* @author treeroot oB0 8
* @since 2006-2-2 ] `B,L*m6
* @version 1.0 r'd:SaU+
*/ <,@H;|mZ
public class ImprovedQuickSort implements SortUtil.Sort { &*aer5?`
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private static int MAX_STACK_SIZE=4096; 7.$]f71z
private static int THRESHOLD=10; 1]>$5 1Q
/* (non-Javadoc) P#[IUXtT
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 4Hml.|$
*/ OgKWgvy
public void sort(int[] data) { 0Q$~k
int[] stack=new int[MAX_STACK_SIZE]; 'je8k7`VA
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int top=-1; AJ\VY;m7F
int pivot; (L
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int pivotIndex,l,r; i<#h]o
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stack[++top]=0; i $[,-4v
stack[++top]=data.length-1; $v:gBlj%"
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while(top>0){ VR4E
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int j=stack[top--]; :'d76pM-
int i=stack[top--]; emv ;m/&8
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pivotIndex=(i+j)/2; <Spr6U9p7
pivot=data[pivotIndex]; 56Sh
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SortUtil.swap(data,pivotIndex,j); B:O+*3j
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//partition ^V<J69ny|9
l=i-1; AZxrJ2G
r=j; NV8]#b
do{ [|a(
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); ;48P vw>g}
SortUtil.swap(data,l,r); @[d#mz
} N 8:"&WM
while(l SortUtil.swap(data,l,r); ezcS[r
SortUtil.swap(data,l,j); 7.Ml9{M/i
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if((l-i)>THRESHOLD){ v9E+(4I9_
stack[++top]=i; &<gUFcw7Ui
stack[++top]=l-1; |.b%rVu
} 2q"_^deI5*
if((j-l)>THRESHOLD){ uX[O,l^}
stack[++top]=l+1; c8#T:HM|`
stack[++top]=j; =<[7J]%
} 3TU'*w
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} ljup#:n
//new InsertSort().sort(data); nU}~I)@V
insertSort(data); V.;:u#{@-Q
} M4TrnZ1D}
/** qs!>tw
* @param data a?zR8$t|
*/ EkRdpiLB
private void insertSort(int[] data) { Q&u>7_, Du
int temp; Az
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); MxY50^}(
} 968Ac}OA
} 4)c+t"h
} IIq"e~"Vs
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} ,3:QB_
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