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快速排序: 13x p_j
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package org.rut.util.algorithm.support; m ~$v;?i
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import org.rut.util.algorithm.SortUtil; ey$&;1x#5
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/** |P?*5xPB
* @author treeroot 6(-N FnT
* @since 2006-2-2 63IM]J
* @version 1.0 Cq~dp/V
*/ .8JTe0
public class QuickSort implements SortUtil.Sort{ Ml-6OvQ7g
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/* (non-Javadoc) F*ylnB3z
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \:LW(&[!
*/ 7;@]t^d=$
public void sort(int[] data) { j^RmrOg,
quickSort(data,0,data.length-1); Yrq~5)%
} ~})e?q;b
private void quickSort(int[] data,int i,int j){ Tpa5N'O
int pivotIndex=(i+j)/2; c'\dFb9a
//swap NL+N%2XG7
SortUtil.swap(data,pivotIndex,j); iuul7VR-%
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int k=partition(data,i-1,j,data[j]); R[]Mdt<
SortUtil.swap(data,k,j); )MT}+ai
if((k-i)>1) quickSort(data,i,k-1); `r 4fm`<
if((j-k)>1) quickSort(data,k+1,j); Q\sK"~@3
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} "qy,*{~
/** N?`' /e
* @param data 4Ftu
* @param i ]7c=PC
* @param j w7&A0M
* @return `N8O"UcoBo
*/ i SQu#p@
private int partition(int[] data, int l, int r,int pivot) { }"%N4(Kd
do{ a(ZcmYzXU
while(data[++l] while((r!=0)&&data[--r]>pivot); w5 Li&m
SortUtil.swap(data,l,r); Bk{]g=DO
} SUK?z!f<i
while(l SortUtil.swap(data,l,r); + Vdpy(
return l; %mgE;~"&
} $3kH~3{]
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} P[fq8lDA
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改进后的快速排序: }c:M^Ff
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package org.rut.util.algorithm.support; )fAUum
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import org.rut.util.algorithm.SortUtil; e]$s
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/** :[d9tm
* @author treeroot @>7%qS
* @since 2006-2-2 ;<4a*;IO
* @version 1.0 )=(kBWM
*/ 5#z1bu
public class ImprovedQuickSort implements SortUtil.Sort { 1k^oS$UT
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private static int MAX_STACK_SIZE=4096; b\,+f n
private static int THRESHOLD=10; 3PF_H$`oJ
/* (non-Javadoc) j5h-dK
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =-Ck4e *T
*/ 1{.9uw"2S
public void sort(int[] data) { /g.U&oI]D
int[] stack=new int[MAX_STACK_SIZE]; #lO Mm9
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int top=-1; tQ601H>o
int pivot; D)}v@je"yP
int pivotIndex,l,r; !dT4
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stack[++top]=0; lk =<A"^S
stack[++top]=data.length-1; `
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while(top>0){ rSNi@;
int j=stack[top--]; *=xr-!MEk
int i=stack[top--]; 3iU=c&P
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pivotIndex=(i+j)/2; R^e'}+Z
pivot=data[pivotIndex]; e~(5%CO>#j
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SortUtil.swap(data,pivotIndex,j); Y|/ 8up
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//partition KG{St{uJ
l=i-1; P+HXn8@
r=j; >5
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do{ o<!?7g{
while(data[++l] while((r!=0)&&(data[--r]>pivot)); LXCx~;{\
SortUtil.swap(data,l,r); a09<!0Rp
} W(/h Vt
while(l SortUtil.swap(data,l,r); >KKMcTOYY
SortUtil.swap(data,l,j); {f p[BF
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if((l-i)>THRESHOLD){ #)VF3T@#'
stack[++top]=i; [a<SDMR
stack[++top]=l-1; ?Ss!e$jf
} h@wgd~X9
if((j-l)>THRESHOLD){ -H-~;EzU
stack[++top]=l+1; II=79$n`G
stack[++top]=j; j_7mNIr
} '/%H3A#L
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} wwcBsJ1{
//new InsertSort().sort(data); XRQ4\bMA8
insertSort(data); ygl0k \
} PeEj&4k
/** *DhiN
* @param data \z}
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*/ Y\'}a+:@Ph
private void insertSort(int[] data) { ( &x['IR
int temp; `~q <N
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); UJ6v(:z<
} Z;)%%V%o
} seeBS/%
} IMONgFBS
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} K\c#ig
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