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快速排序: ugBCBr
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package org.rut.util.algorithm.support; HVAYPerH
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import org.rut.util.algorithm.SortUtil; GA.8@3
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/** D6Wa.,r
* @author treeroot z@j8lv2j1
* @since 2006-2-2 H,NF;QPPC
* @version 1.0 rT>wg1:
*/ Alq(QDs
public class QuickSort implements SortUtil.Sort{ @}ZVtrz
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/* (non-Javadoc) "Y.y:Vv;
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) OZ&o:/*HM
*/ GN>@ZdVG}#
public void sort(int[] data) { H"F29Pu2
quickSort(data,0,data.length-1); V~ _>U}
} #LNED)Vg
private void quickSort(int[] data,int i,int j){ e#q}F>/L
int pivotIndex=(i+j)/2; }GIt!PG
//swap Yr|4Fl~U
SortUtil.swap(data,pivotIndex,j); !Z6{9sKR=]
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int k=partition(data,i-1,j,data[j]); d"Y{UE
SortUtil.swap(data,k,j); w2J<WC+_<
if((k-i)>1) quickSort(data,i,k-1); 6w7 7YTJ
if((j-k)>1) quickSort(data,k+1,j); %jM,W}2
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} @%SQFu@FJ
/** ~QVH<`sn
* @param data 6H|S;K+
* @param i z?//rXuO
* @param j jj>]9z
* @return Ir]\|t
*/ S,=|AD
private int partition(int[] data, int l, int r,int pivot) { M3Kfd
do{ b`_Q8 J
while(data[++l] while((r!=0)&&data[--r]>pivot); B7%U_F|m
SortUtil.swap(data,l,r); #LCb
} IGN1gs
while(l SortUtil.swap(data,l,r); -K$)DvV^(E
return l; wA.\i
} XfmwVjy
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} J8D,ZfPN`d
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改进后的快速排序: H)&R=s
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package org.rut.util.algorithm.support; :Qq#Z
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import org.rut.util.algorithm.SortUtil; ?fS9J
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/** NuI9iU
* @author treeroot QCJM&
* @since 2006-2-2 oXS}IL
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* @version 1.0 H[|~/0?K
*/ ?1".;foZ
public class ImprovedQuickSort implements SortUtil.Sort { Dhv3jg;lq
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private static int MAX_STACK_SIZE=4096; \[nut;
private static int THRESHOLD=10; =Runf
+}
/* (non-Javadoc) LHmZxi?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <6=c,y
*/ C.QO#b
public void sort(int[] data) { ~;] d"'
int[] stack=new int[MAX_STACK_SIZE]; mcok/,/
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int top=-1; y_9Ds>p!T
int pivot; 6zn5UW#q
int pivotIndex,l,r; 5:Uso{
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stack[++top]=0; -{_PuJ "
stack[++top]=data.length-1; =":,.Ttq41
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while(top>0){ >i
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int j=stack[top--]; h.fq,em+H
int i=stack[top--]; :i7;w%B
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pivotIndex=(i+j)/2; )_NO4`ejs/
pivot=data[pivotIndex]; Q7A MRrN
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SortUtil.swap(data,pivotIndex,j); ;=UsAB]
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//partition u-C)v*#L
l=i-1; i@CxI<1'
r=j; iyog`s c
do{ 39jG8zr=Z[
while(data[++l] while((r!=0)&&(data[--r]>pivot)); -{+}@?
SortUtil.swap(data,l,r); l@:0e]8|o
} V1JIht>Opo
while(l SortUtil.swap(data,l,r); .{KVMc
SortUtil.swap(data,l,j); Lh<).<S
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if((l-i)>THRESHOLD){ hpJ-r
stack[++top]=i; PYzvCf`?
stack[++top]=l-1; &VcV$8k
} ]+$?u&0?w
if((j-l)>THRESHOLD){ W}1
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stack[++top]=l+1; Tb-F]lg$
stack[++top]=j; .}*"Nv
} [fIg{Q
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} 3[f):
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//new InsertSort().sort(data); <^uBoKB/f
insertSort(data); bs'n+:X`
} ]0\MmAJRn
/** VD\=`r)nT
* @param data t()c=8qF|u
*/ r"R#@V\'1b
private void insertSort(int[] data) { ri.I pRe
int temp; zv"Z DRW
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); x$%!U[!3
} I`p;F!s
} as_PoCoss
} 5 u0HI
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} ;({W#Wa
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