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快速排序: HrS-o=
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package org.rut.util.algorithm.support; #\l#f8(l
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import org.rut.util.algorithm.SortUtil; C1w6[f1+
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/** U_C[9Z'P
* @author treeroot O[j$n
* @since 2006-2-2 H.]p\UY9
* @version 1.0 CsX@u#
*/ E|"QYsi.Ck
public class QuickSort implements SortUtil.Sort{ 9 Eqv^0u
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/* (non-Javadoc) qE*h UzA
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Txa
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*/ 1deK}5'
public void sort(int[] data) { UXPF"}S2
quickSort(data,0,data.length-1); OIY
} gHox>r6.A
private void quickSort(int[] data,int i,int j){ R
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int pivotIndex=(i+j)/2; ,X)/ T!ff
//swap E^C [G)7n
SortUtil.swap(data,pivotIndex,j); `1i\8s&O6@
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int k=partition(data,i-1,j,data[j]); Q6$^lRNOpk
SortUtil.swap(data,k,j); y3Ul}mVhA
if((k-i)>1) quickSort(data,i,k-1); wJg&OQc9
if((j-k)>1) quickSort(data,k+1,j); C
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} X3j|J/
/** [!j;jlh7},
* @param data =l4F/?u]f@
* @param i Z5`U+ (
* @param j S;}/ql y
* @return @@5JuI-!
*/ {`+:!X
private int partition(int[] data, int l, int r,int pivot) { jL*s(Yq
do{ ;]VLA9dC
while(data[++l] while((r!=0)&&data[--r]>pivot); bC,SE*F\
SortUtil.swap(data,l,r); +HF*X~},i
} Eyh(257
while(l SortUtil.swap(data,l,r); I|tn7|*-A[
return l; S #C;"se
} 50^CILKo7
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} SN5Z@kK
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改进后的快速排序: RPZ
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package org.rut.util.algorithm.support; :MILOwF
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import org.rut.util.algorithm.SortUtil; ch)#NHZ9F
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/** ',s{N9
* @author treeroot 6)1xjE#
* @since 2006-2-2 LDbo=w
* @version 1.0 -c
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*/ oR}'I
public class ImprovedQuickSort implements SortUtil.Sort { vFK!LeF%
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private static int MAX_STACK_SIZE=4096; oRHWb_$"
private static int THRESHOLD=10; [(iJj3s!
/* (non-Javadoc) jTN!\RH9NF
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +K61-Div
*/ /'L/O;H20
public void sort(int[] data) { X({R+
int[] stack=new int[MAX_STACK_SIZE]; /H$/s=YU\U
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int top=-1; gx=2]~O1(
int pivot; NBO&VYs|
int pivotIndex,l,r; eXCH*vZY
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stack[++top]=0; @\Yu?_a
stack[++top]=data.length-1; XB+Juk&d
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while(top>0){ ^fhkWx 4i
int j=stack[top--]; .]BJM?9
int i=stack[top--]; LLJsBHi-
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pivotIndex=(i+j)/2; =~ ="#
pivot=data[pivotIndex]; aZL
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SortUtil.swap(data,pivotIndex,j); G;;iGN
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//partition 29k\}m7l<*
l=i-1; JDm7iJxc_
r=j; UP@-@syGw
do{ g({dD;
while(data[++l] while((r!=0)&&(data[--r]>pivot)); *!u
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SortUtil.swap(data,l,r); ?q hme
} 8p.O rdp
while(l SortUtil.swap(data,l,r); ek]CTUl*
SortUtil.swap(data,l,j); d1/uI^8>
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if((l-i)>THRESHOLD){ /Avl&Rd
stack[++top]=i; E{E%nXR)
stack[++top]=l-1; K*oWcsu
} &+7G|4!y
if((j-l)>THRESHOLD){ J@Qw6J
stack[++top]=l+1; psAdYEGk!
stack[++top]=j; :a
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} oWdvpvO
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} ZH=oQV)6
//new InsertSort().sort(data); 28d=-s=[
insertSort(data); aDE)Nf}
} `"<