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快速排序: H'0S;A+Y6
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package org.rut.util.algorithm.support; 00ho*p!E'
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import org.rut.util.algorithm.SortUtil; YI/vt2
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/** .*+&>m7
* @author treeroot $t^`Pt*:u
* @since 2006-2-2 '-et:Lv7
* @version 1.0 ]#;JPO#*
*/ ;)*Drk*t,
public class QuickSort implements SortUtil.Sort{ V*)gJg
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/* (non-Javadoc) _F$?Z
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) :D EZ$gi
*/ L))(g][;
public void sort(int[] data) { zc_3\N
quickSort(data,0,data.length-1); 1
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} @YRBZ6FH
private void quickSort(int[] data,int i,int j){ Yd9y8TqJ
int pivotIndex=(i+j)/2; JyV"jL
//swap 1]"b.[P>
SortUtil.swap(data,pivotIndex,j); rTcH~s
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int k=partition(data,i-1,j,data[j]); d]<tFx>CQW
SortUtil.swap(data,k,j); p ^Ruf?>
if((k-i)>1) quickSort(data,i,k-1); )Fbkt(1
if((j-k)>1) quickSort(data,k+1,j); !.!Ervi!N
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} 4GJsVA (d|
/** N?aU<-Tn
* @param data #qzozQ4
* @param i ^K8Ey#T
* @param j .- w*&Hd7b
* @return p AD@oPC
*/ %*,'&S
private int partition(int[] data, int l, int r,int pivot) { eD(#zfP/+
do{ %NKf@If)
while(data[++l] while((r!=0)&&data[--r]>pivot); d)LifsD)
SortUtil.swap(data,l,r); ~FJd{$2x`
} u(P
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while(l SortUtil.swap(data,l,r); ,JR7N_"I
return l; B<W{kEY
} 2`x[y?Tn
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} NVQIRQ.
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改进后的快速排序: ?>e-6*.
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package org.rut.util.algorithm.support; h_J'dJS
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import org.rut.util.algorithm.SortUtil; ,>)/ y
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/** r>5,U:6Q/
* @author treeroot *9G;n!t
* @since 2006-2-2 SJL?(S*
* @version 1.0 C{4[ 7
*/ WVKzh
public class ImprovedQuickSort implements SortUtil.Sort { Pr" 2d\
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private static int MAX_STACK_SIZE=4096; dx|j,1e
private static int THRESHOLD=10; kZeb^Q+,
/* (non-Javadoc) v~j21`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) A^G%8 )\
*/ zXB.)4T
public void sort(int[] data) { rZ<@MV|d
int[] stack=new int[MAX_STACK_SIZE]; rB-&'#3%
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int top=-1; wPOQy~:
int pivot;
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int pivotIndex,l,r; =MA$xz3
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stack[++top]=0; lO[[iMHl<
stack[++top]=data.length-1; >%t"VpvR
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while(top>0){ GC.
int j=stack[top--]; 2!}5shB
int i=stack[top--]; |GLa`2q|
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pivotIndex=(i+j)/2; oQAD
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pivot=data[pivotIndex]; c&ymVB?G:1
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SortUtil.swap(data,pivotIndex,j); sRqFsj}3e
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//partition ?FJU>+{">
l=i-1; K.B!-<
r=j; =5isT
do{ 3x=T&X+
while(data[++l] while((r!=0)&&(data[--r]>pivot)); !gu#
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SortUtil.swap(data,l,r); }<m9w\pA
} w\!aKeP'
while(l SortUtil.swap(data,l,r); cE'MSB
SortUtil.swap(data,l,j); pwr,rAJ}$j
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if((l-i)>THRESHOLD){ *Mk5*_
stack[++top]=i; NvY%sx,
stack[++top]=l-1; X&b)E0]pR
} um~U_&>
if((j-l)>THRESHOLD){ T|[zk.8=E
stack[++top]=l+1; h{#Hwp
stack[++top]=j; [WW3'= e^
} bejvw?)S.
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} *>I4X=
//new InsertSort().sort(data); Xf(H_&K
insertSort(data); qf-0 | w
} rZEL7{
/** Dn1aaN6
* @param data f5'Cq)Vw_
*/ < j^8L^
private void insertSort(int[] data) { {FNmYneh?6
int temp; 4-1=1)c*
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); +G)L8{FY(
} hX;JMQ915
} e'Njl?>3
} 5o- WA1
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} s|FfBG
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