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快速排序: 6ddRFpe
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package org.rut.util.algorithm.support; o~9sO=-O
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import org.rut.util.algorithm.SortUtil; wpp!H<')
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/** }Ml BmD
* @author treeroot \[qxOZ{
* @since 2006-2-2 %y\5L#T!>
* @version 1.0 [MQ* =*
*/ kOdA8XRY
public class QuickSort implements SortUtil.Sort{ "N">RjJ"
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/* (non-Javadoc) T{2)d]Y
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) !Pz#czo
*/ FGPqF;
public void sort(int[] data) { #6
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quickSort(data,0,data.length-1); $IS!GS&:
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private void quickSort(int[] data,int i,int j){ ?hAO-*);
int pivotIndex=(i+j)/2; YcV^Fqi!
//swap w >%^pO~}`
SortUtil.swap(data,pivotIndex,j); BW6Ox=sr<
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int k=partition(data,i-1,j,data[j]); JU;`c>8=)
SortUtil.swap(data,k,j); @ ;@~=w
if((k-i)>1) quickSort(data,i,k-1); -T;^T1
if((j-k)>1) quickSort(data,k+1,j); Q=>5@sZB
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} YD@Z}NE
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/** FZ RnIg
* @param data u Fw1%
* @param i XZ{rKf2
* @param j e v0>j4Q
* @return 8ki3>"!A
*/ mR|5$1[b
private int partition(int[] data, int l, int r,int pivot) { 4!OGNr$V@
do{ pEz^z9
while(data[++l] while((r!=0)&&data[--r]>pivot); WtKKdL
SortUtil.swap(data,l,r); ?&zi{N
} r7].48D
while(l SortUtil.swap(data,l,r); &SPY'GQ!
return l; pH.&C 5kA
} i-;#FT+Xc
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} M%la@2SK=
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改进后的快速排序: -9.lFuI
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package org.rut.util.algorithm.support; hr&&b3W3p
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import org.rut.util.algorithm.SortUtil; livKiX`
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/** >&:}L%
* @author treeroot L1I1SFG
* @since 2006-2-2 YlUh|sK7m
* @version 1.0 !q,7@W3i
*/ }apno|W&
public class ImprovedQuickSort implements SortUtil.Sort { k H<C9z2=
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private static int MAX_STACK_SIZE=4096; U,p'<rmS
private static int THRESHOLD=10; [0105l5
/* (non-Javadoc) ~4Gc~ "
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) jUKMDlH
*/ '(C+qwdRv
public void sort(int[] data) { AX%}ip[PC
int[] stack=new int[MAX_STACK_SIZE]; ,52Lm=n
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int top=-1; Cse`MP
int pivot; tFc<f7k
int pivotIndex,l,r; ]LZ#[xnM7
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stack[++top]=0; *k; bkd4x
stack[++top]=data.length-1; +6l#hO7h
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while(top>0){ 9xj }<WM
int j=stack[top--]; g 8uq6U
int i=stack[top--]; iZiT/#, H2
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pivotIndex=(i+j)/2; [zm@hxym
pivot=data[pivotIndex]; ~]RfOpq^w
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SortUtil.swap(data,pivotIndex,j); sbX7VfAR`
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//partition ^X+qut+~
l=i-1; [e
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r=j; gm,AH85
do{ i ]8bj5j{
while(data[++l] while((r!=0)&&(data[--r]>pivot)); Vt3*~Beb
SortUtil.swap(data,l,r); ?wlRHVZ
} {4A,&pR
while(l SortUtil.swap(data,l,r); -`{W~yz
SortUtil.swap(data,l,j); uq-`1m}
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if((l-i)>THRESHOLD){ WkE="E}
stack[++top]=i; Li|~%E1
stack[++top]=l-1; ZzgzeT+bv
} {DKZ~
if((j-l)>THRESHOLD){ )-1e}VF(U
stack[++top]=l+1; \-]tvgA~&
stack[++top]=j; #9r}Kr=P
} 2)}*'_E9
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} %{4U\4d@'
//new InsertSort().sort(data); :<B_V<
insertSort(data); $z*"@
} axt;}8
/** ]S]W|m7=.Z
* @param data 8rS;}Bt
*/ e(a,nZF.
private void insertSort(int[] data) { 2]9
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int temp; |n tWMm:(
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ^7? WR?!
} _V1:'T8
} GRYw_}Aa
} w{dRf!b69
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} 'R'hRMD9o
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