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快速排序: X-duG*~
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package org.rut.util.algorithm.support; mA."*)8VNg
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import org.rut.util.algorithm.SortUtil; @<2pYIi8
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/** she`_'?5
* @author treeroot J8%|Gd0#4
* @since 2006-2-2 p"JSYF
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* @version 1.0 Q?>#sN,
*/ 8fN0"pymo
public class QuickSort implements SortUtil.Sort{ a~%ej.)l
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/* (non-Javadoc) m^=,
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) DYl^6]
*/ I45A$nV#Q
public void sort(int[] data) { j\vK`.z
quickSort(data,0,data.length-1); r:q#l~;^
} 1t0FJ@)*
private void quickSort(int[] data,int i,int j){ *HC8kD a%$
int pivotIndex=(i+j)/2; 5bw]cv$i
//swap 9t[278B6
SortUtil.swap(data,pivotIndex,j); \(CW?9)
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int k=partition(data,i-1,j,data[j]); 5B2,=?+o
SortUtil.swap(data,k,j); :+5afv}
if((k-i)>1) quickSort(data,i,k-1); Lr^xp,_ n
if((j-k)>1) quickSort(data,k+1,j); U&5zs r
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} t[maUy_A
/** o
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* @param data iF0a
* @param i 2%8Y-o?
* @param j $SXxAS1
* @return %(Ys-GeGr
*/ v;Dcq
private int partition(int[] data, int l, int r,int pivot) { ;?!rpj
do{ \,EPsQV0?
while(data[++l] while((r!=0)&&data[--r]>pivot); .g#=~{A
SortUtil.swap(data,l,r); iK]g3ew|
} L8zqLDi&
while(l SortUtil.swap(data,l,r); ##@#:B
return l; ~
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改进后的快速排序: 0%F.]+6[O4
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package org.rut.util.algorithm.support; EM*OrUe
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import org.rut.util.algorithm.SortUtil; 5Nb_K`Vp*
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/** Uxemlp%%*
* @author treeroot #eC;3Kq#-
* @since 2006-2-2 w"v'dU^
* @version 1.0 <KwK
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*/ x~;EH6$5'/
public class ImprovedQuickSort implements SortUtil.Sort { /Tj"Fl\h
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private static int MAX_STACK_SIZE=4096; u7"VeTz
private static int THRESHOLD=10; B#aH\$_U
/* (non-Javadoc) zw:C*sY
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) b#g
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*/ *kQCW#y0
public void sort(int[] data) { ZCBPO~&hO'
int[] stack=new int[MAX_STACK_SIZE]; T;4`wB8@
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int top=-1; #\;>8
int pivot; qijcS2E6S
int pivotIndex,l,r; `.'i V[fr
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stack[++top]=0; h1XMx'}B
stack[++top]=data.length-1; ?{: D,{+
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while(top>0){ ufCqvv>'
int j=stack[top--]; NGD*ce"w
int i=stack[top--]; ns#~}2"d
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pivotIndex=(i+j)/2; h/Hl?O8[
pivot=data[pivotIndex]; )_8}53C
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SortUtil.swap(data,pivotIndex,j); :,kU#eZ$-
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//partition T^$g N|
l=i-1; |rFR8srPG
r=j; sz/ *w 7
do{ f<89$/w
while(data[++l] while((r!=0)&&(data[--r]>pivot)); wn+j39y?ZY
SortUtil.swap(data,l,r); 1n'$Ji7
} j
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while(l SortUtil.swap(data,l,r); 1TNz&=e
SortUtil.swap(data,l,j); efjO8J[uk-
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if((l-i)>THRESHOLD){ *KK[(o}^J-
stack[++top]=i; [5Fd P0
stack[++top]=l-1; hCM8/Vvx6
} MBB5wj
if((j-l)>THRESHOLD){ M
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stack[++top]=l+1; 4.|-m.a
stack[++top]=j; Hz?!BV0
} /vjGjb=3U
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} $Z;B QJVH
//new InsertSort().sort(data); 2{ o0@
insertSort(data); (*,8KLV_i
} p9-0?(]
/** Q.,DZp
* @param data N = LM?(H
*/ ljPq2v ]
private void insertSort(int[] data) { r6`\d k
int temp; /_V'DJV
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); fVe@YqNa
} =m}TU)4.
} pW\z\o/2
} $$JIBf8
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} 1SW4Y
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