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快速排序: k% NrL@z
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package org.rut.util.algorithm.support; >3!DOv
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import org.rut.util.algorithm.SortUtil; *F|+2?a:$
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/** @Kp1k> ov
* @author treeroot w?S8@|MK
* @since 2006-2-2 |@ *3^'
* @version 1.0 K-6p'|
*/ 6i-*N[!U
public class QuickSort implements SortUtil.Sort{ )WmZP3$^TX
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/* (non-Javadoc) {6:&
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3;A$<s
*/ nd;O(s;
public void sort(int[] data) { 8m|x#*5fQl
quickSort(data,0,data.length-1); *W%'Di
} y
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private void quickSort(int[] data,int i,int j){ nNu[c[V
int pivotIndex=(i+j)/2; Pj._/$R[/
//swap W8VO)3nmD
SortUtil.swap(data,pivotIndex,j); i(P>Y2s
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int k=partition(data,i-1,j,data[j]); hg4J2m
SortUtil.swap(data,k,j); V_lGj
if((k-i)>1) quickSort(data,i,k-1); 7N6zqjIB
if((j-k)>1) quickSort(data,k+1,j); hR0]8l|
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} [WYJrk.
/** z1FL8=
* @param data O/$ v69:
* @param i 9\:w8M X'
* @param j DP0Z*8Ia
* @return 3<3t;&e
*/ 9>IsqYc
private int partition(int[] data, int l, int r,int pivot) { 'f8
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do{ kR_E6Fl
while(data[++l] while((r!=0)&&data[--r]>pivot); m
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SortUtil.swap(data,l,r); .T{U^0 )
} >pnz_MQ
while(l SortUtil.swap(data,l,r); =/m}rcDN
return l; X tR`?
} eWw y28t
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} g&P9UW>qS
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改进后的快速排序: [RW,{A
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package org.rut.util.algorithm.support; [:B W+6
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import org.rut.util.algorithm.SortUtil; Q6xgLx[
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/** [|jIC
* @author treeroot .N&QW
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* @since 2006-2-2 /%;/pi
* @version 1.0 ]Px:d+wX:
*/ XGL"gD
public class ImprovedQuickSort implements SortUtil.Sort { y^3,X_0
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private static int MAX_STACK_SIZE=4096; -^0KE/
private static int THRESHOLD=10;
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/* (non-Javadoc) I ;l`VtD
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >" i~ x
*/ 2AmR(vVa"
public void sort(int[] data) { (Y&R0jt
int[] stack=new int[MAX_STACK_SIZE]; =w t-YM
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int top=-1; N0=b[%g;n
int pivot; ?fm2qrV@fp
int pivotIndex,l,r; \#HL`R"
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stack[++top]=0; E#m76]vkCU
stack[++top]=data.length-1; L{zamVQG
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while(top>0){ i;gw=Be
int j=stack[top--]; -g~iE]x6Y
int i=stack[top--]; :LG}yq^
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pivotIndex=(i+j)/2; Ed4_<:
pivot=data[pivotIndex]; 5QNBB|X@
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SortUtil.swap(data,pivotIndex,j); -0/=k_q_
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//partition Sv~PXi^`H
l=i-1; ">03~:oA
r=j; Id; mn}+~
do{ nvw NjN
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ;I[.
SortUtil.swap(data,l,r); l@(t^68OD
} 4c~*hMry
while(l SortUtil.swap(data,l,r); }6F_2S3c
SortUtil.swap(data,l,j); NWaI[P
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if((l-i)>THRESHOLD){ %9fa98>
stack[++top]=i; !x+MVJ]
stack[++top]=l-1; h4B+0
} <#:Ebofsn
if((j-l)>THRESHOLD){ _Jt_2o%G
stack[++top]=l+1; ]KfghRUH
stack[++top]=j; "87O4
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} &:IfhS
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} 0q-0zXlSL
//new InsertSort().sort(data); ZK W@pW]U
insertSort(data); _gis+f/8h
} 2&3eAJC
/** yOn H&Jj
* @param data !]n{l_5r
*/ uMljH@xBc
private void insertSort(int[] data) { 2y&_Z^kI?
int temp; UXXqE4x
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); zEnC[~W
} fq)Ohb
} >^2ZM
} e/g<<f-
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} `HMligT
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