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快速排序: Xu`c_
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package org.rut.util.algorithm.support; V%'`nJ!
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import org.rut.util.algorithm.SortUtil; 4>nY't;0
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/** W-q2|NK
* @author treeroot G$pTTT6#
* @since 2006-2-2 $,q~ q^0
* @version 1.0 Htn=h~U`z
*/ ,~8:^*0s
public class QuickSort implements SortUtil.Sort{ !/+ZKx("9
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/* (non-Javadoc) GVk&n"9kp
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) :@)UI,
*/ SA&0f&07i
public void sort(int[] data) { F>Rz}-Fy
quickSort(data,0,data.length-1); x@I*(I
} <l]P
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private void quickSort(int[] data,int i,int j){ py.lGywb_
int pivotIndex=(i+j)/2; /%9D$\
//swap K:
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SortUtil.swap(data,pivotIndex,j); Nq1la8oQ3
}#'wy
int k=partition(data,i-1,j,data[j]); Kk1 591'
SortUtil.swap(data,k,j); HQ~`ha.
if((k-i)>1) quickSort(data,i,k-1); %JM:4G|q
if((j-k)>1) quickSort(data,k+1,j); $ysemDq-a\
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} R>SS\YC'X
/** t!RR5!
* @param data C( 8i0(1
* @param i /y lO["<Q
* @param j &C<K|F!j!
* @return D7|[:``
*/ (n+2z"/
private int partition(int[] data, int l, int r,int pivot) { OJiW@Z_\
do{ RY'f%c
while(data[++l] while((r!=0)&&data[--r]>pivot); _@9[c9bO
SortUtil.swap(data,l,r); kcKcIn{
} \"Z^{Y[,;
while(l SortUtil.swap(data,l,r); AE`X4 q
return l; i2KN^"v?N
} '?dO[iQ$:
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} 2g~qVT,
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改进后的快速排序: aTS\NpK&
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package org.rut.util.algorithm.support; <WFA3
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import org.rut.util.algorithm.SortUtil; |N_tVE
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/** ST$~l7p
* @author treeroot )3# gpM
* @since 2006-2-2 Fw5|_@&k
* @version 1.0 _+PiaJ&'
*/ T<(1)N1H`
public class ImprovedQuickSort implements SortUtil.Sort { #\s*>Z
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private static int MAX_STACK_SIZE=4096; ap=m5h27
private static int THRESHOLD=10; ~_opU(;f
/* (non-Javadoc) aX`"V/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +v.uP [H
*/ {<&i4;
public void sort(int[] data) { {y)O?9q
int[] stack=new int[MAX_STACK_SIZE]; MCOiB<L6
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int top=-1; /jl{~R#1
int pivot; ]&6# {I-
int pivotIndex,l,r; HS> (y2}'
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stack[++top]=0; Py*( %
stack[++top]=data.length-1; M)S(:Il6Xx
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while(top>0){ -^sW{s0Rc
int j=stack[top--]; Zjqa n
int i=stack[top--]; vD<6BQR
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pivotIndex=(i+j)/2; },58B
pivot=data[pivotIndex]; 0K/Pth"*
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SortUtil.swap(data,pivotIndex,j); k(LZ,WSR
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//partition ,/0Q($oz
l=i-1; $A~UA
r=j; zVN/|[KP4
do{ GL;@heP
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 3ARvSz@5
SortUtil.swap(data,l,r); Gk_%WY*
} ,=sbK?&
while(l SortUtil.swap(data,l,r); pde,@0(Fa
SortUtil.swap(data,l,j); q#LB 2M
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if((l-i)>THRESHOLD){ ZK:dhwer
stack[++top]=i; W0e+yIaR
stack[++top]=l-1; g4b-~1[S
} ?LJ$:u
if((j-l)>THRESHOLD){ fP3e{dVf
stack[++top]=l+1; 2iOn\
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stack[++top]=j; 1ocd$)B|}
} TdGda'C
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} 'Cv,:Q
//new InsertSort().sort(data); 3#GZ6:rVJ
insertSort(data); aD)$aK
} !ieMhJ5r
/** oh*Hzb
* @param data n>Cl;cN=
*/ wq yw#)S
private void insertSort(int[] data) { @ig'CF%(
int temp; x_za
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 6,C2PR_+
} 3V=(P.A Tm
} aq~>$CHa
} /$NDH]a
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} 5)712b(&
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