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快速排序: v$owG-_><
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package org.rut.util.algorithm.support; T<mk98CdE
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import org.rut.util.algorithm.SortUtil; qd%5[A
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/** ~BaU2S@y
* @author treeroot gPd:>$
* @since 2006-2-2 |bVNlL"xN
* @version 1.0 d]}
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*/ f)vD2_E
public class QuickSort implements SortUtil.Sort{ >8#(GXnSt
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/* (non-Javadoc) I,l%6oPa
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6Bo~7gnc
*/ jgs kK
public void sort(int[] data) { 7Q/v#_e(
quickSort(data,0,data.length-1); s@'};E^]@r
} T=A7f6`
private void quickSort(int[] data,int i,int j){ 0v,DQJ?w8
int pivotIndex=(i+j)/2; /e!/
//swap [64K?l0&
SortUtil.swap(data,pivotIndex,j); KQNSYI7a
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int k=partition(data,i-1,j,data[j]); yaa+j8s]
SortUtil.swap(data,k,j); mRW(]OFIai
if((k-i)>1) quickSort(data,i,k-1); fp:j~a>E
if((j-k)>1) quickSort(data,k+1,j); lF 8B+
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} Ni(D[?mZ
/** Iu[^"
* @param data M#=woj&[
* @param i Fu^^Jex
* @param j s<sqO,!
* @return VCX})sp
*/ _ _-rP
private int partition(int[] data, int l, int r,int pivot) { "Y7RvL!U
do{ =3a`NO5!
while(data[++l] while((r!=0)&&data[--r]>pivot); |2
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SortUtil.swap(data,l,r); c5mv4 MC
} @>ONp|}@qI
while(l SortUtil.swap(data,l,r); "sUe:F;
return l; b0rC\^x
} }zlvs
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} .Uh-Wi[
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改进后的快速排序: kD >|e<}\
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package org.rut.util.algorithm.support; rw
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import org.rut.util.algorithm.SortUtil; {S~2m2up0L
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/** nC_<pq^tr
* @author treeroot HqcXP2
* @since 2006-2-2 S]K^wj[
* @version 1.0 w^A8ZT0^7
*/ v\n!Li H
public class ImprovedQuickSort implements SortUtil.Sort {
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private static int MAX_STACK_SIZE=4096;
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private static int THRESHOLD=10; wAF>C[ <\
/* (non-Javadoc) !D7\$
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) i._d^lR\t
*/ m&Ms[X
public void sort(int[] data) { HTQ.kV
int[] stack=new int[MAX_STACK_SIZE]; zp% MK+x
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int top=-1; '?_I-="Mr
int pivot; dm8veKW'l
int pivotIndex,l,r; 1YAy\F~`.
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stack[++top]=0; rnmWw#
stack[++top]=data.length-1; d0MX4bhZ
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while(top>0){ Y0&w;P
int j=stack[top--]; 4JU#3
int i=stack[top--]; i*.Z~$
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pivotIndex=(i+j)/2; ,(OA5%A9zK
pivot=data[pivotIndex]; Sn7.KYS
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SortUtil.swap(data,pivotIndex,j); rH8?GR0<
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//partition N^%[
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l=i-1; 0t/ S_Q
r=j; SY>N-fW\H:
do{ ds5<4SLj
while(data[++l] while((r!=0)&&(data[--r]>pivot)); w?oIKj
SortUtil.swap(data,l,r); h,TDNR<1L
}
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while(l SortUtil.swap(data,l,r); ndF
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SortUtil.swap(data,l,j); pC_2_,6$
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if((l-i)>THRESHOLD){ OFQsfW3O
stack[++top]=i; "N7C7`izc
stack[++top]=l-1; H{p+gj^J
} rf1-E5 7#
if((j-l)>THRESHOLD){ _Xsn1
stack[++top]=l+1; 0Zk A.p
stack[++top]=j; |\~cjPX(
} "84.qgYaG
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} 34s:|w6y
//new InsertSort().sort(data); {P1W{|
insertSort(data); _wZ(%(^I
} pf] sL/g
/** JfKl=vg
* @param data dXrv
*/ 4;w_o9o
private void insertSort(int[] data) { xCoQ>.4p
int temp; -bZ^A~<O,
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); `S$BBF;
} R4@C>\c%m
} Ddt(*z
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} K'1rS[^>R
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} UL"JwqD
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