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快速排序: ~E8L,h~
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package org.rut.util.algorithm.support; eP?=tUB!S
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import org.rut.util.algorithm.SortUtil; #VvU8"u
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/** &Hi;>
* @author treeroot %W(/W9B$/F
* @since 2006-2-2 -MK9IO]i
* @version 1.0 FxFRrRRH@
*/ up@I,9C/
public class QuickSort implements SortUtil.Sort{ 8PB 8h
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/* (non-Javadoc) !RXG{1:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ;
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*/ t@;r~Sb
public void sort(int[] data) { 5r)]o'?s
quickSort(data,0,data.length-1); V JJ6q
} {f(RY j
private void quickSort(int[] data,int i,int j){ R<)^--n
int pivotIndex=(i+j)/2; 7'g{:dzS*3
//swap = pCO1<wR
SortUtil.swap(data,pivotIndex,j); Wik8V 0(
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int k=partition(data,i-1,j,data[j]); @2`$ XWD
SortUtil.swap(data,k,j); !U"?vS l
if((k-i)>1) quickSort(data,i,k-1); <k'%rz
if((j-k)>1) quickSort(data,k+1,j); 0! W$Cz[
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} W\pO`FL
/** m<e_Z~ ^G
* @param data ~PtIq.BY
* @param i @2;/-,4O
* @param j fP KFU
* @return bzWWW^kNL
*/ %B~@wcI)W
private int partition(int[] data, int l, int r,int pivot) { ~-tKMc).X
do{ lDX\"Fq
while(data[++l] while((r!=0)&&data[--r]>pivot); _/5#A+ ?
SortUtil.swap(data,l,r); '* eeup
} b6?&h:{k
while(l SortUtil.swap(data,l,r); (MGYX_rD
return l; EY^+ N>
} X-<l+WP
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} .Cz9?]jyI
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改进后的快速排序: J3z:U&%=
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package org.rut.util.algorithm.support; #/0d
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import org.rut.util.algorithm.SortUtil; pGdFeEkB/
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/** %F}i2!\<L
* @author treeroot m>9j dsqB
* @since 2006-2-2 9SQcChG~j
* @version 1.0 fZgEJsr
*/ L}\ oFjVju
public class ImprovedQuickSort implements SortUtil.Sort { EM7Z g 65
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private static int MAX_STACK_SIZE=4096; AF\gB2^
private static int THRESHOLD=10; F nc MIzp
/* (non-Javadoc) G@+R!IG
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ZZ324UuATX
*/ gZ>)
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public void sort(int[] data) { [J8;V|v
int[] stack=new int[MAX_STACK_SIZE]; 045_0+r"@
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int top=-1; sXwa`_{
int pivot; F#)@ c
int pivotIndex,l,r; E<[Y KY
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stack[++top]=0; P47x-;
stack[++top]=data.length-1; eXAJ%^iD
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while(top>0){ ;J,`v5z0:
int j=stack[top--]; 7V2xg h!W
int i=stack[top--]; O?$]/d
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pivotIndex=(i+j)/2; IAi|4,y_L
pivot=data[pivotIndex]; /@?lV!QiO
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SortUtil.swap(data,pivotIndex,j); J3XrlSc
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//partition uE,g|51H/
l=i-1; tF:AqR:(~
r=j; w_P2\B^
do{ R.KznJ
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 6E{(_i
SortUtil.swap(data,l,r); 2&zklXuo:
} (9Of,2]&E
while(l SortUtil.swap(data,l,r); X$*]$Ge>
SortUtil.swap(data,l,j); K/0Wp %
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if((l-i)>THRESHOLD){ ML.|\:r*
stack[++top]=i; Nj{;
stack[++top]=l-1; 9~{,Hj1xE
} zG)vmysJf
if((j-l)>THRESHOLD){ ZkryoIQ%=
stack[++top]=l+1; :[&QoEZW
stack[++top]=j; l?B=5*0
} joBS{]
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} vP%}XEF
//new InsertSort().sort(data); <-DQ(0xg
insertSort(data); 9p, PW A
} C@Wd Pjxj
/** o8X? 1
* @param data ?&-$Zog
*/ LSrKi$
private void insertSort(int[] data) { { u3giB
int temp; eig{~3
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); i`w)dS
} Xc$Zkfmms
} e F)my
} P9)L1l<3I
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} -TS5g1
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