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快速排序: _{%H*PxTn=
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package org.rut.util.algorithm.support; PMcyQ2R->
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import org.rut.util.algorithm.SortUtil; \9^@,kfP
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/** tAUMSr|?
* @author treeroot nc)`ISI
* @since 2006-2-2 H_^c K
* @version 1.0 ~O6=dR
*/ Is[0ri
public class QuickSort implements SortUtil.Sort{ ":ycyN@g
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/* (non-Javadoc) Viw3 /K
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =KLYR UW
*/ QZo l(2~Y
public void sort(int[] data) { D.?gV_
quickSort(data,0,data.length-1); '-=?lyKv
} I4'j_X
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private void quickSort(int[] data,int i,int j){ %+~0+ev7r
int pivotIndex=(i+j)/2; +L6d$+
//swap ?a@l.ZM*
SortUtil.swap(data,pivotIndex,j); *VB*/^6A
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int k=partition(data,i-1,j,data[j]); ^(R
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SortUtil.swap(data,k,j); |Oe6OCPf
if((k-i)>1) quickSort(data,i,k-1); Wt=[R 4=
if((j-k)>1) quickSort(data,k+1,j); p20Nk$.
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} &PX'=UT
/** VbjW$?
* @param data p
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* @param i ~m7+^c@,
* @param j vNIQc "\-
* @return ,U}8(D~:
*/ R#>E{[9
private int partition(int[] data, int l, int r,int pivot) { "5Mo%cUp
do{ z~qQ@u|
while(data[++l] while((r!=0)&&data[--r]>pivot); [Wc 73-
SortUtil.swap(data,l,r); Alz#zBGb
} ff0,K#-
while(l SortUtil.swap(data,l,r); &n|gPp77$
return l; *O~D lf
} G`jhzG
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} 0dW1I|jR
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改进后的快速排序: e]QkZg2?Yn
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package org.rut.util.algorithm.support; aO1cd_d6x_
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import org.rut.util.algorithm.SortUtil; ryN-d%t?
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/** PLD!BD
* @author treeroot )8;'fE[p}
* @since 2006-2-2 <OUApp H
* @version 1.0 c1i7Rc{q
*/ (c"!0v
public class ImprovedQuickSort implements SortUtil.Sort { 0Ko,S(M_
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private static int MAX_STACK_SIZE=4096; 9p XFC9
private static int THRESHOLD=10; dU,/!|.K
/* (non-Javadoc) \iFE,z
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) qF?S[Z;
*/ <qBPN{'a"
public void sort(int[] data) { dZ*o H#B
int[] stack=new int[MAX_STACK_SIZE]; LBg#KQ@
+] #>6/2q
int top=-1; V4 7Fp
int pivot; @azS)4L
int pivotIndex,l,r; jVDNThm+
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stack[++top]=0; g!$
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stack[++top]=data.length-1; a
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while(top>0){ UxW~yk
int j=stack[top--]; bWqGypq4
int i=stack[top--]; QO8/?^d
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pivotIndex=(i+j)/2; +=R:n^r^,
pivot=data[pivotIndex]; ?NL2|8
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SortUtil.swap(data,pivotIndex,j); XP'KgTF
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//partition UJb7v:^
l=i-1; *G9;d0
r=j; $hL0/T-m
do{ m2;%|QE(
while(data[++l] while((r!=0)&&(data[--r]>pivot)); |:\h3M
SortUtil.swap(data,l,r); PSRGlxdO
} JOMZ&c^
while(l SortUtil.swap(data,l,r); zVIzrz0
SortUtil.swap(data,l,j); Z5\6ca
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if((l-i)>THRESHOLD){ nJ,56}
stack[++top]=i; Ac|`5'/Tx
stack[++top]=l-1; v#~,)-D&
} '
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if((j-l)>THRESHOLD){ H Q2-20
stack[++top]=l+1; VAq:q8(K
stack[++top]=j; q+K`+& @\
} 5+U~ZW0|+
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} RKe19l_V
//new InsertSort().sort(data); E( TY%wO
insertSort(data); b`^$2RM&
} ? f%@8%px
/** (k[<>$hL*
* @param data eN/Jb;W
*/ IcA]<}0!"v
private void insertSort(int[] data) { r@_;L>
int temp; 8'zwyd3
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); c6e?)(V>
} X3nwA#If1
} U<*dDE~z
} *@O;IiSE
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} $lO\eQGxB
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