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快速排序: p*F&G=ZE
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package org.rut.util.algorithm.support; !>-cMI6E
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import org.rut.util.algorithm.SortUtil; `h_,I R<
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/** G!k&'{2
* @author treeroot vb)Z&V6(
* @since 2006-2-2 E~ _2Jf\U
* @version 1.0 jDIO,XuF
*/ $'dJ+@
public class QuickSort implements SortUtil.Sort{ dON4r2-yC
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/* (non-Javadoc) <",4O
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6ND,4'6
*/ Zalgg/.
public void sort(int[] data) { Ra<mdteZT
quickSort(data,0,data.length-1); 9r@r\-
} :pcKww|V
private void quickSort(int[] data,int i,int j){ /E$"\md
int pivotIndex=(i+j)/2; jFpXTy[>
//swap 6UR.,*f=
SortUtil.swap(data,pivotIndex,j); dG}fpQ3&
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int k=partition(data,i-1,j,data[j]); 1.!rq,+>1
SortUtil.swap(data,k,j); xi8RE@gm
if((k-i)>1) quickSort(data,i,k-1); _,_>B8
if((j-k)>1) quickSort(data,k+1,j); +r *f2\S
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} y 562g`"U
/** L)&?$V
* @param data "AP''XNi
* @param i ?Q;8D@
* @param j *5 ]fjh{
* @return ZdeRLX
*/ ViQxOUE
private int partition(int[] data, int l, int r,int pivot) { tKrr5SRb
do{ *,{. oO9#
while(data[++l] while((r!=0)&&data[--r]>pivot); I
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SortUtil.swap(data,l,r); +b1(sk=4z
} n?_!gqK
while(l SortUtil.swap(data,l,r); hc2[,Hju{O
return l; 9"1 0:\U
} =_I2ek
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} 'x{g P?.
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改进后的快速排序: I0P)DR
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package org.rut.util.algorithm.support; N[d*_KN.!
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import org.rut.util.algorithm.SortUtil; 2MQgTFM9
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/** `Gzukh
* @author treeroot %&5 !vK
* @since 2006-2-2 :&}(?=<R}L
* @version 1.0 XWV)
*/ UhYeyT
public class ImprovedQuickSort implements SortUtil.Sort { PN[
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private static int MAX_STACK_SIZE=4096; vpcx 1t<
private static int THRESHOLD=10; =`[08
/* (non-Javadoc) )(~4fA5j)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) T`7;Rl'Q
*/ akHcN]sa2
public void sort(int[] data) { [H)NkR;I
int[] stack=new int[MAX_STACK_SIZE]; Er^ijh,
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int top=-1; A9\m.3jo
int pivot; ."Wdpf`~
int pivotIndex,l,r; =fG c?PQ
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stack[++top]=0; |>@Gbgw^M
stack[++top]=data.length-1; 0H,1"~,w]
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while(top>0){ i71,
int j=stack[top--]; 4V9DPBh
int i=stack[top--]; Nl3x
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pivotIndex=(i+j)/2; S453oG"
pivot=data[pivotIndex]; /=I&-gxC
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SortUtil.swap(data,pivotIndex,j); OY7\*wc:
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//partition ;SoKX?up5
l=i-1; O^ZOc0<
r=j; <
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do{ FVM:%S
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); Ab`mID:
SortUtil.swap(data,l,r); s8Kf$E^?e.
} B2t.;uz(,
while(l SortUtil.swap(data,l,r); Z_Jprp{3h
SortUtil.swap(data,l,j); Ug02G
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if((l-i)>THRESHOLD){ j_S///
stack[++top]=i; B5h-JON]-
stack[++top]=l-1; Dz/I"bZLC
} Z*S
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if((j-l)>THRESHOLD){ iL(rZT&^
stack[++top]=l+1; !]1X0wo\
stack[++top]=j; ^{&Vv(~!Q
} hgMh]4wN*
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} ofbNg_K>
//new InsertSort().sort(data); a$ a+3}\
insertSort(data); vRa|lGeW
} %^s;{aN*!
/** $G/h-6+8
* @param data g+Vfd(e
*/ 92_F8y*D
private void insertSort(int[] data) { -5,QrMM<
int temp; eUlF4l<]
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); F{}mlQg
} PmOm>
} q !\Ht2$b
} *O-1zIlp
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