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快速排序: R)Q/Ff@o0
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package org.rut.util.algorithm.support; @wMQC\Z
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import org.rut.util.algorithm.SortUtil; %fBP:5%K
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/** r:73uRk
* @author treeroot G LoiH#R
* @since 2006-2-2 {wHvE4F2
* @version 1.0 2+o! o
*/ ^glX1 )
public class QuickSort implements SortUtil.Sort{ {N"*olx
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/* (non-Javadoc) }|SIHz!R
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6-ti Rk~
*/ w"BIv9N
public void sort(int[] data) { t@6w$5:}
quickSort(data,0,data.length-1); *.:! Ax
} PP],HB+*[
private void quickSort(int[] data,int i,int j){ "~_$T@^k>
int pivotIndex=(i+j)/2; }#&~w0P
//swap sbgJw
SortUtil.swap(data,pivotIndex,j); ~};]k }
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int k=partition(data,i-1,j,data[j]); $,.3&zsy
SortUtil.swap(data,k,j); K[*h+YO
if((k-i)>1) quickSort(data,i,k-1); zUJx&5/
if((j-k)>1) quickSort(data,k+1,j); lQh~Q<[ge
; 4l-M2
} fjcr<&{:
/** Bpm,mp4g\#
* @param data q ?(A!1(u
* @param i }M^_Z#|,
* @param j p?}f|mQS)
* @return q)vK`\Y
*/ ) sRN!~
private int partition(int[] data, int l, int r,int pivot) { j{)fC]8H
do{ U&`6&$]
while(data[++l] while((r!=0)&&data[--r]>pivot); 5[nmP95YK
SortUtil.swap(data,l,r); eU`;L[
} 3xP~~j;7
while(l SortUtil.swap(data,l,r); JR])xPI`
return l; -!@H["
} jiqi!*
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} vf6`s\6
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改进后的快速排序: mlD%d!.
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package org.rut.util.algorithm.support;
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import org.rut.util.algorithm.SortUtil; DE5d]3B
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/** I; ^xAd3G
* @author treeroot ?Y%}(3y
* @since 2006-2-2 VIb;96$Or
* @version 1.0 92s4u3L;
*/ BO[+E'2
public class ImprovedQuickSort implements SortUtil.Sort { j'\>Nn+
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private static int MAX_STACK_SIZE=4096; &Q2NU$
private static int THRESHOLD=10; 9*BoYFw92*
/* (non-Javadoc) pi|\0lH6W
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) t#a.}Jl
*/ cZ6?P`X
public void sort(int[] data) { NAJ '><2
int[] stack=new int[MAX_STACK_SIZE]; f+{c1fb>s
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int top=-1; $[)6H7!U)
int pivot; |Uc<;> l
int pivotIndex,l,r; X";TZk
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stack[++top]=0; tX@0:RX%
stack[++top]=data.length-1; ]^Sd9ba
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while(top>0){ 0Ulxp
int j=stack[top--]; 5P-K *C&
int i=stack[top--]; $Vo/CZW7
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pivotIndex=(i+j)/2; $$k7_rs
pivot=data[pivotIndex]; F(J\ctha
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SortUtil.swap(data,pivotIndex,j); Cw6>^
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//partition iU.!oeR?
l=i-1; .UNF~}^H
r=j; 1R5Yn(
do{
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); xt?3_?1
SortUtil.swap(data,l,r); AmP#'U5
} ue,#,3{m
while(l SortUtil.swap(data,l,r); -L+\y\F
SortUtil.swap(data,l,j); rd XCWK$E
n;e."^5
if((l-i)>THRESHOLD){ ;7;zhJs1t
stack[++top]=i; ?lu_}t]
stack[++top]=l-1; ,lrYl!,
} Tm(Q@
if((j-l)>THRESHOLD){ X(4s;i
stack[++top]=l+1; <]Ij(+J;
stack[++top]=j; FgXu1-
} 2 9&sydu
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} qXXYF>Z-
//new InsertSort().sort(data); CkmlqqUHC
insertSort(data); xR\D(FLVS
} Hlz'a1\:O]
/** pw0Px
* @param data |Dl*w/n
*/ sjkWz2]S
private void insertSort(int[] data) { C4&U:y<ju
int temp; b7?U8/#'
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); KC&H*
} SNQz8(O
} 59&T