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快速排序: M i& ;1!bg
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package org.rut.util.algorithm.support; A|8"}Hm
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import org.rut.util.algorithm.SortUtil; 0WC\uxT7
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/** (O{OQk;CF
* @author treeroot fr/EkL1Dl
* @since 2006-2-2 ):'wxIVGI
* @version 1.0 [(@K;6o
*/ -y-}g[`
public class QuickSort implements SortUtil.Sort{ 3A!a7]fW
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/* (non-Javadoc) `Y:]&w
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) PP$sdmo
*/ (M$0'BV0
public void sort(int[] data) { s{@R|5
quickSort(data,0,data.length-1); G<e+sDQ2
} q13fmK(n-5
private void quickSort(int[] data,int i,int j){ \1!Q.V
int pivotIndex=(i+j)/2; %`C*8fc&
//swap BQ0?B*yqd
SortUtil.swap(data,pivotIndex,j); >8_y-74
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int k=partition(data,i-1,j,data[j]); o6MFMA+vi
SortUtil.swap(data,k,j); 3W7^,ir
if((k-i)>1) quickSort(data,i,k-1); :awkhx
if((j-k)>1) quickSort(data,k+1,j); OP1`!P y
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} QFx3N%
/** QT,T5Q%JP:
* @param data d$3rcH1
* @param i h p|v?3(
* @param j QEs$9a5TE
* @return T&_&l;syA
*/ #gQn3.PX+y
private int partition(int[] data, int l, int r,int pivot) { ByY2KJ7
do{ RqTO3Kf
while(data[++l] while((r!=0)&&data[--r]>pivot); 8TFQ%jv
SortUtil.swap(data,l,r); gS'{JZu2
} 9,'m,2%W
while(l SortUtil.swap(data,l,r); Qb^G1#r@C
return l; $Aw@xC^!
} |T6K?:U7
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} JJd qdX;
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改进后的快速排序: &YXJ{<s
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package org.rut.util.algorithm.support; `MVqd16Y
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import org.rut.util.algorithm.SortUtil; L(TM&
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/** rw'+2\
* @author treeroot '(5GRI<
* @since 2006-2-2 GM6,LzH
* @version 1.0 lD,2])>
*/ J 6KHc^,7
public class ImprovedQuickSort implements SortUtil.Sort { *DPX4P
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private static int MAX_STACK_SIZE=4096; 7.h{"xOx{
private static int THRESHOLD=10; 2%pED
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/* (non-Javadoc) '0D$C},^|8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) xG/Q%A
*/ J{ju3jo
public void sort(int[] data) { 4f\NtQ)
int[] stack=new int[MAX_STACK_SIZE]; 13s/m&
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int top=-1; H.ZIRt!RB
int pivot; ^&?,L@fW
int pivotIndex,l,r; gyvrQ, u
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stack[++top]=0; v1:.t
stack[++top]=data.length-1; +yP!7]
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while(top>0){ FW |&
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int j=stack[top--]; u(f
int i=stack[top--]; jA{5)-g
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pivotIndex=(i+j)/2; i5}Z k r
pivot=data[pivotIndex]; J9mK9{#q
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SortUtil.swap(data,pivotIndex,j); n-ffX*zA(
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//partition tY)L^.* 7
l=i-1; kZw"a*6
r=j; C^)Imr
do{ gs'M^|e)
while(data[++l] while((r!=0)&&(data[--r]>pivot)); -%`~3*L
SortUtil.swap(data,l,r); w jkh*Y
} 6|jZv~rS$
while(l SortUtil.swap(data,l,r); 2`f{D~w
SortUtil.swap(data,l,j); w<9rTHG8,
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if((l-i)>THRESHOLD){ _RIU,uJs
stack[++top]=i; p1KhI;^
stack[++top]=l-1; z(\aJW
} aoN\n]g
if((j-l)>THRESHOLD){ fUjo',<s
stack[++top]=l+1; fB$a)~
stack[++top]=j; !zE{`Ha~
} yvB]rz} i
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} =d{6=2Pt
//new InsertSort().sort(data); 4zMvHe
insertSort(data); Ms!EK
} ws0qwv#
/** xWG@<}H
* @param data M|DMoi8x
*/ O*:87:I d
private void insertSort(int[] data) { Wu][A\3D1
int temp; ZE=sw}=
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); +_]Ui| l
} (]#^q8)]\9
} /I 7V\
} ='m$O
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} ]\M{Abqd{
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