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快速排序:
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package org.rut.util.algorithm.support; *aWh]x9TlU
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import org.rut.util.algorithm.SortUtil; |;)_-=L0P
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/** v@yqTZ
* @author treeroot _RxnB?
* @since 2006-2-2 fS|e{!iI"
* @version 1.0 dJnKa]X
*/ ^%Cd@!dk
public class QuickSort implements SortUtil.Sort{ P, l
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/* (non-Javadoc) =EA @
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) {Ke
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*/ 2YWO'PL
public void sort(int[] data) { wA/!A$v(
quickSort(data,0,data.length-1); .*oL@iX
} ^mFsrw
private void quickSort(int[] data,int i,int j){ w_@{v wM$A
int pivotIndex=(i+j)/2; qk3~]</
//swap .-&
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SortUtil.swap(data,pivotIndex,j); G:lhrT{
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int k=partition(data,i-1,j,data[j]); zZRLFfz<9
SortUtil.swap(data,k,j); tB`"gC~
if((k-i)>1) quickSort(data,i,k-1); Viw,YkC
if((j-k)>1) quickSort(data,k+1,j); <b_K*]Z
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} ,%xat`d3,3
/** 4f8XO"k7t=
* @param data @g;DA)!(
* @param i iWr
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* @param j 1(# H%
* @return C\BKdx5;
*/ dQ-g\]d|
private int partition(int[] data, int l, int r,int pivot) { mSu$1m8
do{ wG)[Ik6:
while(data[++l] while((r!=0)&&data[--r]>pivot); OiZ-y7;k^
SortUtil.swap(data,l,r); 9 4lt?|3=
} r^rk@W;[
while(l SortUtil.swap(data,l,r); m
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return l; /=9dX;
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}
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改进后的快速排序: u6l)s0Q
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package org.rut.util.algorithm.support; Q$`uZ
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import org.rut.util.algorithm.SortUtil; "o u{bKe
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/** &1yErGXC
* @author treeroot -:45Q{u/
* @since 2006-2-2 ?^7X2 u$nm
* @version 1.0 \k=%G_W
*/ \21Gg%W5AE
public class ImprovedQuickSort implements SortUtil.Sort { #{?RE?nD
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private static int MAX_STACK_SIZE=4096; f61vE
private static int THRESHOLD=10; /.A"HGAk
/* (non-Javadoc) ZXiJ5BZ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %Q]thv:
*/ ,g"JgX
public void sort(int[] data) { DXO'MZon3
int[] stack=new int[MAX_STACK_SIZE]; \fI05GZ
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int top=-1; ze5#6Vzd&
int pivot; wCv9VvF`
int pivotIndex,l,r; u:W/6QS
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stack[++top]=0; Ks(l :oUB
stack[++top]=data.length-1; \{a5]G(4s
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while(top>0){ I*cb\eU8Y
int j=stack[top--]; ]uh/ !\
int i=stack[top--]; 3N2d@R
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pivotIndex=(i+j)/2; BAi0w{
pivot=data[pivotIndex]; 6iEg]FI
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SortUtil.swap(data,pivotIndex,j); JHZjf7g$k
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//partition ~Ij/vyB_
l=i-1; J#3[,~
r=j; <KCyXU*
do{ ubVZEsoW?
while(data[++l] while((r!=0)&&(data[--r]>pivot)); K g.O2F77
SortUtil.swap(data,l,r); i 2uSPV!Tf
} P;'ZdZ(SLu
while(l SortUtil.swap(data,l,r); G6x'Myg I
SortUtil.swap(data,l,j); 7,alZ"%W
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if((l-i)>THRESHOLD){ z_{_wAuY
stack[++top]=i; TA:#K
stack[++top]=l-1; ]EQ*!
} ICe;p
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if((j-l)>THRESHOLD){ ZIh)D[n
stack[++top]=l+1; >$r o\/
stack[++top]=j; {/aHZ<I&^h
} .XkVdaX
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} 3%Q9521
//new InsertSort().sort(data); ~>~qA0m"m
insertSort(data); _nX8f
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} c"1Z,M;G
/** oQo5y_o~
* @param data %yl17:h#
*/ qFq$a9w|@
private void insertSort(int[] data) { >XM]UdP
int temp; pDvznpQ
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); d 79 2#Dc
} PqF&[M<)
} tL<.B
} F=#V/ #ia
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} N&Ho$,2s
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