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快速排序: ~vF*&^4Vh
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package org.rut.util.algorithm.support; ],c0nz^%BR
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import org.rut.util.algorithm.SortUtil; ;8H&FsR
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/** =o@}~G&HA
* @author treeroot P~(&lu/;P
* @since 2006-2-2 :$Cm]RZ
* @version 1.0 !KV!Tkx h
*/ k2Q[v
public class QuickSort implements SortUtil.Sort{ R5sEQ| E
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/* (non-Javadoc) )F9IzR-&m
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) #7fOH
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*/ j Hq+/\
public void sort(int[] data) { I85wP}c(
quickSort(data,0,data.length-1); oX6Cd:c-
} >uCO=T,|
private void quickSort(int[] data,int i,int j){ PCCE+wC6
int pivotIndex=(i+j)/2; ~Dg:siw
//swap @.e4~qz\
SortUtil.swap(data,pivotIndex,j); :/->m6C`0
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int k=partition(data,i-1,j,data[j]); ,vR>hyM
SortUtil.swap(data,k,j); }ll&EB
if((k-i)>1) quickSort(data,i,k-1); ccv
if((j-k)>1) quickSort(data,k+1,j); I>MLI=[Kg
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} ^3HSw ?a"
/** Va[&~lA)
* @param data 7gtaI3
* @param i hbXm Ist
* @param j >u%Bn\G
* @return KMT$/I{p,
*/ uJ"#j
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private int partition(int[] data, int l, int r,int pivot) { drCL7.j#L
do{ ZV Ko$q:F
while(data[++l] while((r!=0)&&data[--r]>pivot); ycN!N
SortUtil.swap(data,l,r); PR;Bxy
} w[2E:Nj
while(l SortUtil.swap(data,l,r); 1sUgjyGQ
return l; zRh)q,Dt
} V^(W)\
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} 319 4]
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改进后的快速排序: 3meZ]u
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package org.rut.util.algorithm.support; 89[/UxM)
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import org.rut.util.algorithm.SortUtil; oKRI2ni$j9
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/** xqT} 9,
* @author treeroot b#709VHm
* @since 2006-2-2 |$8N*7UD
* @version 1.0 "+Ks#
*/ Xe}I;sKrB
public class ImprovedQuickSort implements SortUtil.Sort { =
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private static int MAX_STACK_SIZE=4096; .:-*89c
private static int THRESHOLD=10; s]vsD77&
/* (non-Javadoc) &~"N/o
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) z'Bvjul
*/ p@$92> '
public void sort(int[] data) { o/U}G,|G
int[] stack=new int[MAX_STACK_SIZE]; ='#7yVVcs
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int top=-1; M7DoAS{6e
int pivot; rp]H&5.*
int pivotIndex,l,r; vSQB~Vw8t
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stack[++top]=0; D<Z\6)|%I
stack[++top]=data.length-1; Lxa<zy~b
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while(top>0){ n`Ypv{+ {%
int j=stack[top--]; T5[(vTp
int i=stack[top--]; Ornm3%p+e
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pivotIndex=(i+j)/2; *E@as
pivot=data[pivotIndex]; *eAt '
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SortUtil.swap(data,pivotIndex,j); a/d8_(0
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//partition ylmVmHmc
l=i-1; * se),CP!s
r=j; ~@^ pX*%i
do{ ]VVx2ERs
while(data[++l] while((r!=0)&&(data[--r]>pivot)); iA2TvP#
SortUtil.swap(data,l,r); ]:6IW:
} 5Shc$Awc!
while(l SortUtil.swap(data,l,r); (i)O@Jve
SortUtil.swap(data,l,j); \a:-xwUu<
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if((l-i)>THRESHOLD){ &I(3/u
stack[++top]=i; $a')i<m^g
stack[++top]=l-1; P+p:Ed80
} ;S2/n$Ju_
if((j-l)>THRESHOLD){ ovtZHq/
stack[++top]=l+1; cMUmJH
stack[++top]=j; P; =,Q$e8
} b<g9L4s
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} *=QWx[K|
//new InsertSort().sort(data); L{1PCs36c
insertSort(data); .|6Wmn-uS
} k1^&;}/f:
/** a
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* @param data ][Cg8
*/ Cp-p7g0wlg
private void insertSort(int[] data) { p-8x>dmP(
int temp; {NIE:MXX
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); v3/G.B@=
} H+5N+AKb@
} ~EhM"go
} ,|R\ Z,s
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} ue6&)7:~
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