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快速排序: .)wj{(>TJ
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package org.rut.util.algorithm.support; $B
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import org.rut.util.algorithm.SortUtil; >VAZ^kgi
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/** Z~Mq5#3F
* @author treeroot Q~'a1R
* @since 2006-2-2 z~g7O4#
* @version 1.0 ,8F?v~C
*/ >%"Q]p
public class QuickSort implements SortUtil.Sort{ vd5"phn
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/* (non-Javadoc) zn4Yo
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) t?-7Z6
*/ j=^b'dyL
public void sort(int[] data) { J6!t"eB+
quickSort(data,0,data.length-1); ;,z^!bD
} x+O}R D*G
private void quickSort(int[] data,int i,int j){ @'EP$!c
int pivotIndex=(i+j)/2; Xcq9*!%o
//swap KAg<s}gQJ
SortUtil.swap(data,pivotIndex,j); )-3!-1
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int k=partition(data,i-1,j,data[j]); by {G{M`X
SortUtil.swap(data,k,j); ,{C(<1
if((k-i)>1) quickSort(data,i,k-1); GXEOgf#i
if((j-k)>1) quickSort(data,k+1,j); /WDz;,X
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} r: _-Cj
/** cVZCBcKC?
* @param data ZS uMQ32
* @param i 3q:-98DT
* @param j ifu"e_^
* @return l|-TGjsX
*/ X7sWu{n
private int partition(int[] data, int l, int r,int pivot) { tPS.r.0#^
do{ ksxacRA7\
while(data[++l] while((r!=0)&&data[--r]>pivot); `p&ko$i2
SortUtil.swap(data,l,r); >#@1
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} -(n[^48K
while(l SortUtil.swap(data,l,r); |Hbe]2"x>
return l; cJ&e^$:Er
} Ii?"`d +JA
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} 9?*BN\E5S
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改进后的快速排序: o} #nf$v(
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package org.rut.util.algorithm.support; V*l0|,9
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import org.rut.util.algorithm.SortUtil; F}Bc +i#]
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/** tR5zlm(}
* @author treeroot TJ9,c2d+
* @since 2006-2-2 _%s _w)
* @version 1.0 B{ NKDkDH
*/ FhB^E$r%
public class ImprovedQuickSort implements SortUtil.Sort { Vgs( feGs
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private static int MAX_STACK_SIZE=4096; F9e$2J)C
private static int THRESHOLD=10; W%09.bF
/* (non-Javadoc) ]lF'o&v]
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) jlER_I]
*/ :^SpKe(7
public void sort(int[] data) { ->}K- n ),
int[] stack=new int[MAX_STACK_SIZE]; qEE3x>&T]
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int top=-1; VEd#LSh
int pivot; O0"i>}g4
int pivotIndex,l,r; 1h\: Lj
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stack[++top]=0; 0D>~uNcT}
stack[++top]=data.length-1; }H{{ @RU
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while(top>0){ 8\8uXOS
int j=stack[top--]; 9AJ!7J#v"
int i=stack[top--]; gFJ&t^yL
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pivotIndex=(i+j)/2; fHf+!
pivot=data[pivotIndex]; t4?g_$>
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SortUtil.swap(data,pivotIndex,j); i^uC4S~
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//partition )dLESk
l=i-1; i{VjSWq
r=j; ja~b5Tf9
do{ @( 9#\%=
while(data[++l] while((r!=0)&&(data[--r]>pivot)); #hd<5+$U}l
SortUtil.swap(data,l,r); JBE'B Q@
} /,5`#Gte_
while(l SortUtil.swap(data,l,r); >w9)c|
SortUtil.swap(data,l,j); q4 'x'8
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if((l-i)>THRESHOLD){ z$-/yT"M
stack[++top]=i; ,I=ClmR
stack[++top]=l-1; $X9Ban]
} (k
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if((j-l)>THRESHOLD){ Xr M[8a
stack[++top]=l+1; KLqu[{y.'
stack[++top]=j; ;sNyN#
} ue/6DwUv
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} c0<Y017sG
//new InsertSort().sort(data); Vw9^otJu
insertSort(data); *@G4i
} 5G){7]P+r"
/** #X"\:yN
* @param data [ZURs3q
*/ dWD,iO_"@
private void insertSort(int[] data) { D5T\X-+]O
int temp; ; Z61|@Y
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ]-%ZN+
} ]rn!+z
} lIzJO$8cM
} [p!C+|rro
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} ^Sy\<
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