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快速排序: 3fA+{Y8S
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package org.rut.util.algorithm.support; W#E(?M[r
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import org.rut.util.algorithm.SortUtil; i]J.WFu
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/** ~#i2reG5
* @author treeroot !tcz_%
* @since 2006-2-2 k5J18S
* @version 1.0 dpK-
*/ QnP?j&
public class QuickSort implements SortUtil.Sort{ G+Bk!o
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/* (non-Javadoc) 2g~ @99`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <QO1Yg7}
*/ 0kNKt(_
public void sort(int[] data) { D4C:%D
quickSort(data,0,data.length-1); 7qZC+x6_L
} d7mn(= &
private void quickSort(int[] data,int i,int j){ }2;iIw`
int pivotIndex=(i+j)/2; <:NahxIlu
//swap '=%`;?j
SortUtil.swap(data,pivotIndex,j); vm{8x o
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int k=partition(data,i-1,j,data[j]); 8aIqc
SortUtil.swap(data,k,j); %P M#gnt@
if((k-i)>1) quickSort(data,i,k-1); 9#m3<oSJ
if((j-k)>1) quickSort(data,k+1,j); #/jug[wf*!
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} 4(VV@:_%
/** ExSM=
* @param data {I0U 4]
* @param i ~\i(bFd)
* @param j dvqg H
* @return [z ]P5
*/ y.}{KQ"a*
private int partition(int[] data, int l, int r,int pivot) { 9P)!v.,T/
do{ g1}:;VG=
while(data[++l] while((r!=0)&&data[--r]>pivot); 'RhS%l
SortUtil.swap(data,l,r); dQZdL4
} 9<&M~(dwT4
while(l SortUtil.swap(data,l,r); M.
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return l; $5.52
} @/|g|4
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} -CuuO=h
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改进后的快速排序: F[SZwMf29
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package org.rut.util.algorithm.support; :Yn.Wv-
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import org.rut.util.algorithm.SortUtil; /9&!u )+
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/** /}
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* @author treeroot s]OZ+^Z
* @since 2006-2-2 tgl(*[T2
* @version 1.0 oA@M =
*/ y<w_>O
public class ImprovedQuickSort implements SortUtil.Sort { uR{)%udu
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private static int MAX_STACK_SIZE=4096; TukhGgmF
private static int THRESHOLD=10; J]XLWAM
/* (non-Javadoc) CHZ/@gc
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <5}I6R;
*/ ygj%VG
public void sort(int[] data) { 3<"j/9;K'
int[] stack=new int[MAX_STACK_SIZE]; 2T)k-3
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int top=-1; pfHjs3A=
int pivot; y<j7iN
int pivotIndex,l,r; wK7w[Xt
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stack[++top]=0; dsx<ZwZN>
stack[++top]=data.length-1; G4*&9Wo
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while(top>0){ utuWFAGn A
int j=stack[top--]; ;tVd+[8
int i=stack[top--]; r7g@(K
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pivotIndex=(i+j)/2; hnB`+!
pivot=data[pivotIndex]; xvl{o
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SortUtil.swap(data,pivotIndex,j); @s
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//partition v]EZYEXFL)
l=i-1; $Wj{B@k
r=j; _AX,}9
do{ 3N-
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); }T(=tfv@
SortUtil.swap(data,l,r); ~!~i_L\V
} u&uFXOc'
while(l SortUtil.swap(data,l,r); &g&,~Y/z;
SortUtil.swap(data,l,j); JygJ4RI%j
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if((l-i)>THRESHOLD){ j0~am,yZ
stack[++top]=i; jT$J~MpHh
stack[++top]=l-1; } % Ie
} 89^g$ ac
if((j-l)>THRESHOLD){ pTG[F
stack[++top]=l+1; ^.iRU'{
stack[++top]=j; E56
} J^yqu{
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} U)Hc7%
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//new InsertSort().sort(data); X>yDj]*4P
insertSort(data); 4)D~S4{E5
}
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/** F"k`PF*b
* @param data 8Cp@k=
*/ Z\`SDC
private void insertSort(int[] data) { N,rd= m+
int temp; VnkhY
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); J/K~8sc
} Q"u2<
} (|Gwg \r
} EK=0oy[
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} ru2M"]T
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