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快速排序: o}Xp-P
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package org.rut.util.algorithm.support; bNL E=#ro
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import org.rut.util.algorithm.SortUtil; _abVX#5<
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/** ^_<pc|1
* @author treeroot />n0&~k[h
* @since 2006-2-2 3K#e]zoI
* @version 1.0 6 a$%
*/ tB1Qr**
public class QuickSort implements SortUtil.Sort{ ?8~$du$
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/* (non-Javadoc) Gn_v}31d%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -''vxt?7H&
*/ 525xm"Bs
public void sort(int[] data) { fnXl60C%
quickSort(data,0,data.length-1); uM4,_)L
} ow`\7qr
private void quickSort(int[] data,int i,int j){ _l/6Qpf
int pivotIndex=(i+j)/2; AV8TP-Ls+
//swap *:d_~B?Tn
SortUtil.swap(data,pivotIndex,j); :A
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int k=partition(data,i-1,j,data[j]); 5hDE&hp
SortUtil.swap(data,k,j); *Pq`~W_M7
if((k-i)>1) quickSort(data,i,k-1); >#8`Zy:/Y
if((j-k)>1) quickSort(data,k+1,j); =h&^X>!
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}
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/** IGI2).$[
* @param data $[]=6.s
* @param i /\\C&Px
* @param j cu""vtK
* @return w]%r]PwU+
*/ _
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private int partition(int[] data, int l, int r,int pivot) { ]_-$
do{ &V2G<gm0
while(data[++l] while((r!=0)&&data[--r]>pivot); Z1OcGRN!
SortUtil.swap(data,l,r); gr-%9=Uq
} |]B]0J#_
while(l SortUtil.swap(data,l,r); $~9U-B\
return l; (
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} oYqC"g&4Z
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} `[ne<F?e
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改进后的快速排序: $23R%8j
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package org.rut.util.algorithm.support; ^\wosB3E
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import org.rut.util.algorithm.SortUtil; /Pf7= P
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/** ,f1+jC
* @author treeroot e%f8|3<6
* @since 2006-2-2 B
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* @version 1.0 Q2#)Jx\6!
*/ v'iQLUgI
public class ImprovedQuickSort implements SortUtil.Sort { T&0tW"r?
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private static int MAX_STACK_SIZE=4096; =RV$8.Xp
private static int THRESHOLD=10; @lBH@HR=C
/* (non-Javadoc) %ZZ}TUI W
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ho:,~ A;k
*/ a<HM|dcst
public void sort(int[] data) { ^7_<rs
int[] stack=new int[MAX_STACK_SIZE]; ?s_q|d_
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int top=-1; ^^%*2^
int pivot; 7"S|GEs:
int pivotIndex,l,r; kPxrI=
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stack[++top]=0; 2s(K4~e e
stack[++top]=data.length-1; !-7(.i -
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while(top>0){ {<|0M%v
int j=stack[top--]; ?pVODnP k
int i=stack[top--]; vR`KRI`{
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pivotIndex=(i+j)/2; b0&dpMgh:
pivot=data[pivotIndex]; ?}Mv5SO
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SortUtil.swap(data,pivotIndex,j); ,qr)}s-
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//partition M1oCa,8M+
l=i-1; 9wAP%xh
r=j; */qv}
do{ +6TKk~0e^
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 5\a5^FK~
SortUtil.swap(data,l,r); Cvl"")ZZ`
} 3Zbvf^
while(l SortUtil.swap(data,l,r); ]IoS-)$Z/
SortUtil.swap(data,l,j); g:*yjj
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if((l-i)>THRESHOLD){ JY_' d,O
stack[++top]=i; _=cMa's
stack[++top]=l-1; FB</~
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} "OWq]q#
if((j-l)>THRESHOLD){ $U6)km4
stack[++top]=l+1; |E}N8\Gr
stack[++top]=j; +-{HT+W
} WIbU^WJ0
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} uS&bfx2
//new InsertSort().sort(data); '7xY,IY
insertSort(data); .vb*|So
} Q"(i
/** yX)2
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* @param data x2nNkd0h
*/ 1ITa6vjS
private void insertSort(int[] data) { AFY;;_Xks
int temp; IYrO;GQ
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); v0HFW%YJ^J
} N8!B2uPQ
} >=B8PK+<
} k!!o!r BS
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} 0/*z]2
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