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快速排序: 4]nU%`Z1w
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package org.rut.util.algorithm.support; Yo;/7gG>
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import org.rut.util.algorithm.SortUtil; Z_F:H@-&
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/** wxpD{P
* @author treeroot 6~?7CK
* @since 2006-2-2 /S1EQ%_
* @version 1.0 CyO2Z
*/ 3;~1rw=$<
public class QuickSort implements SortUtil.Sort{ w/KHS#~
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/* (non-Javadoc) W%b<(T;
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <ro0}%-z>M
*/ qc~6F'?R
public void sort(int[] data) { 8#'<SB
quickSort(data,0,data.length-1); hXM8`iFW5
} -h^FSW($-R
private void quickSort(int[] data,int i,int j){ )v;>6(
int pivotIndex=(i+j)/2; ('Wo#3b$
//swap w_pEup\`
SortUtil.swap(data,pivotIndex,j); 4>>{}c!nf
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int k=partition(data,i-1,j,data[j]); K+Q81<X~
SortUtil.swap(data,k,j); D|Wekhm
if((k-i)>1) quickSort(data,i,k-1); AuHOdiJ
if((j-k)>1) quickSort(data,k+1,j); "o#"u[W,
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} lxj_(Uo
/** nH}api^0A
* @param data b>;>*'e
* @param i 0#F3@/1h
* @param j *D
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* @return A?|KA<&m#u
*/ &+6XdhX
private int partition(int[] data, int l, int r,int pivot) { \c/jp5=}
do{ k#R}^Q
while(data[++l] while((r!=0)&&data[--r]>pivot); %75|+((fC
SortUtil.swap(data,l,r); znhe]&Fw
} ma@ws,H
while(l SortUtil.swap(data,l,r); <M nzR
return l; 6#vD>@H
} m'Z233Nt"
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} xb0hJ~e
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改进后的快速排序: 6:>4}WOP
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package org.rut.util.algorithm.support; N~l(ng9'U
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import org.rut.util.algorithm.SortUtil; 4Cke(G
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/** SEXeK2v
* @author treeroot a1M-F3
* @since 2006-2-2 J)A1`(x&T
* @version 1.0 'e02rqip{
*/ HKv:)h{?
public class ImprovedQuickSort implements SortUtil.Sort { #6fp"
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private static int MAX_STACK_SIZE=4096; U4%d#
private static int THRESHOLD=10; GBu&2}
/* (non-Javadoc) LD: w
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %\\l/{`eW
*/ E}c(4RY
public void sort(int[] data) { l*HONl&j
int[] stack=new int[MAX_STACK_SIZE]; +`kfcA#pi
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int top=-1; zCL/^^#
int pivot; [%YA42_`LD
int pivotIndex,l,r; Un^QNd>
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stack[++top]=0; P[ n`X
stack[++top]=data.length-1; 3m#v|52oj
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while(top>0){ C/"fS#<
int j=stack[top--]; w4:S>6X
int i=stack[top--]; ]p(+m_F
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pivotIndex=(i+j)/2; !1C3{
pivot=data[pivotIndex]; s6OnHX\it7
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SortUtil.swap(data,pivotIndex,j); Vi23pDZ5
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//partition o; {
l=i-1; TU$/3fp*
r=j; mC
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do{ hdW",Bf'
while(data[++l] while((r!=0)&&(data[--r]>pivot)); }+#-\a2
SortUtil.swap(data,l,r); qg:R+`z
} *GbC`X)
while(l SortUtil.swap(data,l,r); &BqRyUM$F
SortUtil.swap(data,l,j); ,IA0n79
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if((l-i)>THRESHOLD){ '{\VOU
stack[++top]=i; m;WUp{'
stack[++top]=l-1; "@Bc eD
} Xlw&hKS
if((j-l)>THRESHOLD){ ,G
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stack[++top]=l+1; cn v4!c0
stack[++top]=j; gHQ[D|zu
} T.<eriv
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} Zn1+} Z@I
//new InsertSort().sort(data); kwMuL>5
insertSort(data); yTz@q>6s-
} { r`l
/** zwN;CD1
* @param data -dsB@nPiUw
*/ VmF?8Vi4
private void insertSort(int[] data) { 6b9D db*
int temp; JHwkLAuz
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); &1%W-&bc6
} 'j !!h4
} %Xh/16X${
} chQt8Ar3
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} e-,U@_B
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