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快速排序: Chl^LEN:
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package org.rut.util.algorithm.support; 9ec?L
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import org.rut.util.algorithm.SortUtil; %VB4/~ "
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/** unFm~rcf
* @author treeroot m["e7>9G
* @since 2006-2-2 @$kzes\
* @version 1.0 a5m[
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*/ ~Fo2M wE2~
public class QuickSort implements SortUtil.Sort{ kz}Bc
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/* (non-Javadoc) s+_8U}R
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) J*K=tA
*/ qYVeFSS
public void sort(int[] data) { lmUCrs37
quickSort(data,0,data.length-1); 5`&@3
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} 4`o0?_.'
private void quickSort(int[] data,int i,int j){ /T {R\
int pivotIndex=(i+j)/2; ~C>;0a;<:
//swap `K@N\VM
SortUtil.swap(data,pivotIndex,j); ' xaPahx;
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int k=partition(data,i-1,j,data[j]); *qL'WrB1
SortUtil.swap(data,k,j); M`Wk@t6>
if((k-i)>1) quickSort(data,i,k-1); q},,[t
if((j-k)>1) quickSort(data,k+1,j); _d7;Z%
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} d14@G4#Bd
/** )@U~Li/+
* @param data HLthVc w
* @param i 90F.9rh
* @param j /Dc54Un
* @return `=V1w4J
*/ R)N^j'R~=
private int partition(int[] data, int l, int r,int pivot) { SR.xI:}4
do{ G3!O@j!7w$
while(data[++l] while((r!=0)&&data[--r]>pivot); K5bR7f:
SortUtil.swap(data,l,r); ;H8`^;
} DfGq m-c
while(l SortUtil.swap(data,l,r); oPBKPGD
return l; !]7b31$M_
} t{s>B]i^_w
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} ZvXw#0)v
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改进后的快速排序: c3rj
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package org.rut.util.algorithm.support;
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import org.rut.util.algorithm.SortUtil; m=COF$<
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/** 0S+$l
* @author treeroot }9B},
* @since 2006-2-2 fTX|vy<EMI
* @version 1.0 U4Y)Jk
*/ %< ;u
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public class ImprovedQuickSort implements SortUtil.Sort { vKPLh
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private static int MAX_STACK_SIZE=4096; n/BoK6g
private static int THRESHOLD=10; xi<}n#
/* (non-Javadoc) >}0H5Q8@
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1PWi~1q{Q
*/ 3AP=
public void sort(int[] data) { Yc)Dx3
int[] stack=new int[MAX_STACK_SIZE]; &{wRB l #
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int top=-1; Y>E` 7n
int pivot; zcOm"-E-
int pivotIndex,l,r; ^I6Vz?0Jl
c9nv=?/}f
stack[++top]=0; )FA:wsy~E
stack[++top]=data.length-1; FW3E UC)P
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while(top>0){ R;U4a2~
int j=stack[top--]; 2Z"\%ZD
int i=stack[top--]; F!?f|z,/
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pivotIndex=(i+j)/2; ox.kL
pivot=data[pivotIndex]; MR@Qn[RdM
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SortUtil.swap(data,pivotIndex,j); 9&kPcFX B
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//partition 48;b
l=i-1; XfIsf9
r=j; #{k+^7aQ
do{ cj2^wmkB
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 4}0YLwgJ
SortUtil.swap(data,l,r); ]H`pM9rC
} w!d(NA<|0]
while(l SortUtil.swap(data,l,r); !w!k0z]
SortUtil.swap(data,l,j); FSkX95
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if((l-i)>THRESHOLD){ J5f}-W@
stack[++top]=i; Kxh WZ3
stack[++top]=l-1; 6I_4{
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if((j-l)>THRESHOLD){ 0,#n_"
stack[++top]=l+1; a>Aq/=
stack[++top]=j; t!FC) iY
} DbR!s1ux
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} FKf2Q&2I
//new InsertSort().sort(data); x>4p6H{]0'
insertSort(data); 3RlNEc%)
} lF7".
/** NUh%\{
* @param data NP!LBB)=Y
*/ bVZAf
private void insertSort(int[] data) { Az?^4 1r8
int temp; VS~+W=5}
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ~Kt+j
} 66MUrNW
} PCH$)F4^
}
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} x>J(3I5_b
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