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快速排序: a&XURyp
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package org.rut.util.algorithm.support; ,p$1n;
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import org.rut.util.algorithm.SortUtil; |!57Z4X
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/** #Fu OTBNvB
* @author treeroot 0_"J>rMp
* @since 2006-2-2 U6.$F#n
* @version 1.0 ? 76jz>;b
*/ og2]B\mN4
public class QuickSort implements SortUtil.Sort{ Fo;xA
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/* (non-Javadoc) DOU\X N
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) X`J~3s
*/ g<UjB
public void sort(int[] data) { FE$)[ w,m
quickSort(data,0,data.length-1); x]y~KbdeB
} `n5)oU2q
private void quickSort(int[] data,int i,int j){ !n)2HDYhx,
int pivotIndex=(i+j)/2; "'6KQnpZ
//swap O$#`he/jm
SortUtil.swap(data,pivotIndex,j); ajkRL|^
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int k=partition(data,i-1,j,data[j]); v
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SortUtil.swap(data,k,j); lv$tp,+
if((k-i)>1) quickSort(data,i,k-1); G+\2Aj
if((j-k)>1) quickSort(data,k+1,j); :j?Lil%R
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} h\D
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/**
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* @param data q'c'rN^
* @param i pmQ9iA@=
* @param j (zgXhx_!D
* @return QabF(}61
*/ =$b^X?x
private int partition(int[] data, int l, int r,int pivot) { Sfh \4h$H
do{ SC86+
while(data[++l] while((r!=0)&&data[--r]>pivot); NbG3^(
SortUtil.swap(data,l,r); 3&3S*1b-H
} `;QpPSw +
while(l SortUtil.swap(data,l,r); _Y}(v((;
return l; mQJRq??P
} a8Ci 7<V
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} g<}K^)x
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改进后的快速排序: :[\}Hn=
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package org.rut.util.algorithm.support; Q> @0'y=s
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import org.rut.util.algorithm.SortUtil; WBTX~%*U
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/** ?L{[84GSO
* @author treeroot hQ8/-#LO_
* @since 2006-2-2 Wl::tgU
* @version 1.0 {T m-X`
*/ g4I(uEJk
public class ImprovedQuickSort implements SortUtil.Sort { *Pw;;#\B
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private static int MAX_STACK_SIZE=4096; !:rQ@PSy9
private static int THRESHOLD=10; 8n);NZ
/* (non-Javadoc) IY,&/MCh
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *>S\i7RET
*/ Td"f(&Hk&
public void sort(int[] data) { oDM}h
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int[] stack=new int[MAX_STACK_SIZE]; <P}{0Y~@*W
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int top=-1; $S=lm {
int pivot; [T~O%ly7x&
int pivotIndex,l,r; 2x3&o|J
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stack[++top]=0; H4^-M Sw
stack[++top]=data.length-1; X^fMt]
}MXZ
while(top>0){ yv4hH4Io
int j=stack[top--]; ldi'@^
int i=stack[top--]; y=5s~7]
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pivotIndex=(i+j)/2; wdl6dLu
pivot=data[pivotIndex]; 7P=1+2V
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SortUtil.swap(data,pivotIndex,j); ihf5`mk/$
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//partition l"b78n
l=i-1; IqcPml{\
r=j; CKNH/[ZR,
do{ l)=Rj`M
while(data[++l] while((r!=0)&&(data[--r]>pivot)); jo{GPp}
SortUtil.swap(data,l,r); RK"dPr
} im4V6 f;%
while(l SortUtil.swap(data,l,r); YX!%R]c%
SortUtil.swap(data,l,j); Aw9^}k}UfD
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if((l-i)>THRESHOLD){ _@jl9<t=_
stack[++top]=i; WR gAc%
stack[++top]=l-1; ,MuLu,$/
} kJHUaXM
if((j-l)>THRESHOLD){ $*L@ym
stack[++top]=l+1; J3y5R1?EP
stack[++top]=j; d!e$BiC
} B.Ic8'
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} `m@ 06Q
//new InsertSort().sort(data); :}e*3={4
insertSort(data); &tHT6,Xv(
} "2N3L8?k
/** VO#]IXaP
* @param data K=+w,H#`C
*/ GkaIqBS
private void insertSort(int[] data) { X2q$i
int temp; @M:j~
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 1MX:^L!f8
} zrD$loaW.'
} .+|G`*1<i
} &6r".\;^
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} p\b:uy6#
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