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快速排序: W4$aX5ow$
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package org.rut.util.algorithm.support; l?$X.CwX
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import org.rut.util.algorithm.SortUtil; w>\oz
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/** :-#7j}
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* @author treeroot GApvRR+Z
* @since 2006-2-2 nTc#I~\
* @version 1.0 ovOV&Zt
*/ WMnSkO
public class QuickSort implements SortUtil.Sort{ mi$C%~]5m
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/* (non-Javadoc) @67GVPcxl
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
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public void sort(int[] data) { ?]bx]Y;
quickSort(data,0,data.length-1); O7_y QQAA
} g33Y$Xdk
private void quickSort(int[] data,int i,int j){ A(uo%QE|
int pivotIndex=(i+j)/2; =BN<)f^*s
//swap Xs|d#WbX
SortUtil.swap(data,pivotIndex,j); ^V1\boo=
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int k=partition(data,i-1,j,data[j]); TghT{h@
SortUtil.swap(data,k,j); kCEo */,
if((k-i)>1) quickSort(data,i,k-1); ~8UMwpl-
if((j-k)>1) quickSort(data,k+1,j); Nt_sV7zzb
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} hrD2-S
/** ~3Pp}eO~V
* @param data j@#RfVx
* @param i cUP1Uolvn
* @param j ]K8G}|Wy6
* @return [_`yy
*/ ^tSwA anP\
private int partition(int[] data, int l, int r,int pivot) { ]l h=ZC
do{ RTvOaZ
while(data[++l] while((r!=0)&&data[--r]>pivot); )g?jHm-p\
SortUtil.swap(data,l,r); i;/;zG^=_
} )(yaX
while(l SortUtil.swap(data,l,r); g~,iWoY
return l; _1O .{O
} oiR9NB&<
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改进后的快速排序: Ake l .&
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package org.rut.util.algorithm.support; Het>G{
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import org.rut.util.algorithm.SortUtil; K$GQc"
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/** ar
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* @author treeroot AB0}6g^O
* @since 2006-2-2 [-"ZuUG
* @version 1.0 w(Tr,BFF
*/ hT_Q_1,
public class ImprovedQuickSort implements SortUtil.Sort { 7!(/7U6rP
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private static int MAX_STACK_SIZE=4096; G#f3
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private static int THRESHOLD=10; G(shZ=fq
/* (non-Javadoc) (RrC<5"
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =d<~:!)
*/ 1#;^Z3
public void sort(int[] data) { x $[_ Hix
int[] stack=new int[MAX_STACK_SIZE]; SYQP7oG9oQ
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int top=-1; qf ]le]J
int pivot; 90Sras>F
int pivotIndex,l,r; 3}3b@: <
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stack[++top]=0; ZQir?1=
stack[++top]=data.length-1; 9m_~Zs}Z
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while(top>0){ [euR<i*I#
int j=stack[top--]; s:_j,/H0A}
int i=stack[top--]; l O*
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pivotIndex=(i+j)/2; vg@5`U`^h
pivot=data[pivotIndex]; ^
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SortUtil.swap(data,pivotIndex,j); 7F]Hq
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//partition cD!E.2[
l=i-1; _*{Lha
r=j; 8'qlg|{!~
do{ (Uu5$q(
while(data[++l] while((r!=0)&&(data[--r]>pivot)); <"3${'$k`
SortUtil.swap(data,l,r); XhWo~zh"
} qe
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while(l SortUtil.swap(data,l,r); r|
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SortUtil.swap(data,l,j); +eKLwM
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if((l-i)>THRESHOLD){ 31#jLWY'0
stack[++top]=i; 1gt 7My
stack[++top]=l-1; ySDo(EI4
} ei=u$S.
if((j-l)>THRESHOLD){ vpdPW %B
stack[++top]=l+1; 4m=0e
stack[++top]=j; |f1^&97=+
} 7PUy`H,&
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} L*4=b
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//new InsertSort().sort(data); hcYqiM@8>
insertSort(data); +7
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} dN:^RCFzS
/** oOubqx
* @param data U#w0 E G
*/ E KN<KnU%
private void insertSort(int[] data) { b
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int temp; T/%Y_.NtU
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); Nr)DU.f
} \'('HFr,
} rxJl;!7G
} CO@ kLI
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