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快速排序: '64&'.{#>r
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package org.rut.util.algorithm.support; 4$~]t:n
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import org.rut.util.algorithm.SortUtil; ~~U2Sr
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/** 0D[D;MW
* @author treeroot $rB20!
* @since 2006-2-2 -1tdyCez
* @version 1.0 OD,"8JF
*/ |!r.p_Zt
public class QuickSort implements SortUtil.Sort{ cJEOwAN
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/* (non-Javadoc) O"otzla
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 5z ebH
*/ X(D$eV
public void sort(int[] data) { !i0jk,[B=
quickSort(data,0,data.length-1); /Q7cQ2[EU
} ZE#f{qF(
private void quickSort(int[] data,int i,int j){ j@1rVOmK
int pivotIndex=(i+j)/2; E,Q>jH
//swap #!IezvWf
SortUtil.swap(data,pivotIndex,j); _Qy3A T~
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int k=partition(data,i-1,j,data[j]); +/ A`\9QT
SortUtil.swap(data,k,j); E"ju<q/Q
if((k-i)>1) quickSort(data,i,k-1); 9/lCW
if((j-k)>1) quickSort(data,k+1,j); UWdPB2x[
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} G)(\!0pNZ
/** H'Mc]zw_,
* @param data zj!&12w%3
* @param i $#4J^(I*:
* @param j Cdjh/+!f
* @return fvajNP
*/ u$%>/cv
private int partition(int[] data, int l, int r,int pivot) { ,`7;S,f
do{ `aFy2x`3
while(data[++l] while((r!=0)&&data[--r]>pivot); <1(:W[M
SortUtil.swap(data,l,r); 4(aDi;x "w
} 7m;2M]BRi
while(l SortUtil.swap(data,l,r); ;T0Y=yC
return l;
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} |aiP7C
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改进后的快速排序: lVywc:X
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package org.rut.util.algorithm.support; I0 y+,~\
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import org.rut.util.algorithm.SortUtil; 55vpnRM
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/** aqvt$u8
* @author treeroot >3H/~ Y
* @since 2006-2-2 myT z
* @version 1.0 *_<P%J
*/ Lc>9[!+#
public class ImprovedQuickSort implements SortUtil.Sort { ;!<WL@C~
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private static int MAX_STACK_SIZE=4096; RUTlwTdv
private static int THRESHOLD=10; h+mM
/* (non-Javadoc) 2[&3$-]
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^7`"wj14
*/ 0_HdjK
public void sort(int[] data) { 2e}${NZN
int[] stack=new int[MAX_STACK_SIZE]; 9I>+Q&
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int top=-1; 7@g8nv(p
int pivot; V/Hjd`n)`i
int pivotIndex,l,r; 'hl>pso.
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stack[++top]=0; &z;;Bx0s
stack[++top]=data.length-1; [@ ]f@Wd
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while(top>0){ !FweXFl
int j=stack[top--]; %H:uE*WZ
int i=stack[top--]; qvz2u]IOw
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pivotIndex=(i+j)/2; bS{7 *S
pivot=data[pivotIndex]; ![WX -"lW
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SortUtil.swap(data,pivotIndex,j); zdCeOZ 6
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//partition *|MHQp'A
l=i-1; V\zf yH\~
r=j; Wvl>i HB
do{ \oF79
while(data[++l] while((r!=0)&&(data[--r]>pivot));
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SortUtil.swap(data,l,r); @R=gJ:&a
} hd~X c
while(l SortUtil.swap(data,l,r); .s31D%N
SortUtil.swap(data,l,j); CW k#Amt.
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if((l-i)>THRESHOLD){ -UaUFJa8K&
stack[++top]=i; )SZt If
stack[++top]=l-1; -|mWi
} !|`G<WD
if((j-l)>THRESHOLD){ ]trVlmZXH}
stack[++top]=l+1; ReOp,A/y
stack[++top]=j; 2=X 2M
} -ea>}S
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} @NGK2J
//new InsertSort().sort(data); 0uzm@'^
insertSort(data); Ec| Gom?
} P"0S94o:5J
/** V,bfD3S3
* @param data '~i}2e.
*/ wZVY h
private void insertSort(int[] data) { P0J3ci}^
int temp; HlqvXt\
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); <va3L y)c&
} I0 a,mO;m
} v8"plx=3
} \P]w^
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} M:|Z3p K
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