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快速排序: 6y%0`!
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package org.rut.util.algorithm.support; .4.b*5
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import org.rut.util.algorithm.SortUtil; sNun+xsf^
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/** &d7Z6P'`G
* @author treeroot "CiTa>x
* @since 2006-2-2 ]weoTn:
* @version 1.0 NvM*h%ChM
*/ .ROznCe}
public class QuickSort implements SortUtil.Sort{ "#mBcQ;QLV
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/* (non-Javadoc) kd"N29
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) a^ ,(v
*/ w[P4&?2:
public void sort(int[] data) { ,C3,TkA]
quickSort(data,0,data.length-1); }kg ye2[
} u!1{Vt87
private void quickSort(int[] data,int i,int j){ 4k./(f2+
int pivotIndex=(i+j)/2; RN=` -*E1
//swap R^{)D3
SortUtil.swap(data,pivotIndex,j); gGfoO[B
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int k=partition(data,i-1,j,data[j]); Spt?>sm
SortUtil.swap(data,k,j); s3Cc;#
if((k-i)>1) quickSort(data,i,k-1); = k\J<
if((j-k)>1) quickSort(data,k+1,j); H@]MXP[_
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} [w ;kkMJAy
/** ybp -$e
* @param data <w3!!+oK"
* @param i Z"unF9`"1
* @param j YBh'EL}P
* @return r'gOVi4t1*
*/ 8,dBl!G=
private int partition(int[] data, int l, int r,int pivot) { O12eH
do{ g+X}c/".
while(data[++l] while((r!=0)&&data[--r]>pivot); k4 F"'N
SortUtil.swap(data,l,r); yA47"R
} 2wF8 P)
while(l SortUtil.swap(data,l,r); vv26I
return l; SwZA6R&
} e{Z &d
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} ;#Q%j%J
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改进后的快速排序: $.]l!cmi%Q
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package org.rut.util.algorithm.support; arf8xqR-U]
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import org.rut.util.algorithm.SortUtil; ,AT[@
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/** \TU3rk&X
* @author treeroot y(K"
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* @since 2006-2-2 Z0l+1iMx
* @version 1.0 K_&4D'
*/ QY= = GfHt
public class ImprovedQuickSort implements SortUtil.Sort { V')0 Mr
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private static int MAX_STACK_SIZE=4096; Y`?-VaY
private static int THRESHOLD=10; Dc)dE2
/* (non-Javadoc) s.8{5jVG
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) :6%Z]tt
*/ X.:]=,aGW
public void sort(int[] data) { $M Jm*6h
int[] stack=new int[MAX_STACK_SIZE]; 5h; +Ky!I
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int top=-1; k1Q?'<`
int pivot; /hO1QT}xd
int pivotIndex,l,r; orb_"Qw
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stack[++top]=0; ~K@'+5Pc
stack[++top]=data.length-1; 2WG>, 4W2
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while(top>0){ ?,/U^rf^4
int j=stack[top--]; z?35=%~w
int i=stack[top--]; (y^vqMz
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pivotIndex=(i+j)/2; n?V+dC=F}
pivot=data[pivotIndex]; -lv)tHs<
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SortUtil.swap(data,pivotIndex,j); hJPlq0C
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//partition 0]4(:(B
l=i-1; bJD;>"*
r=j; ~y7jCcd`
do{ W5R\Q,x6
while(data[++l] while((r!=0)&&(data[--r]>pivot)); K<>sOWZ'S
SortUtil.swap(data,l,r); @e{^`\ l=<
} W6Y@U$P#G
while(l SortUtil.swap(data,l,r); D+>1]ij
SortUtil.swap(data,l,j); 0iJue&
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if((l-i)>THRESHOLD){ tor!Dl@Mo
stack[++top]=i; Rn@#d}
stack[++top]=l-1; A~mum+[5
} #Skv(IL
if((j-l)>THRESHOLD){ H*r>Y
stack[++top]=l+1; 4"Hye&O
stack[++top]=j; M8u<qj&<O
} ~zw]5|
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} A=
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//new InsertSort().sort(data); Si~vDQ7"
insertSort(data); )RcL/n
} ]~3U
/** N;[>,0&z
* @param data ccL~#c0P7
*/ 3'X.}>o
private void insertSort(int[] data) { (P`3 @H
int temp; +$Rt+S BD
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); )(@Hd
} 7hcNf,
} e#k<d-sf6
} dh $bfAb
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} 'g{9@PkGn
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