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快速排序: -v]7}[
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package org.rut.util.algorithm.support; V
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import org.rut.util.algorithm.SortUtil; Ft07>E$/Q^
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/** ]`lTkh
* @author treeroot CkOd>Kn
* @since 2006-2-2 f#!Ljjf$;
* @version 1.0 8r~4iVwg
*/ rtPQ:CaA)?
public class QuickSort implements SortUtil.Sort{ wy7f7zIa
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/* (non-Javadoc) a{y;Ub
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) cc@y
*/ TG!sck4/-Q
public void sort(int[] data) { n|8fdiK#}
quickSort(data,0,data.length-1); /m%;wH|6%
} 4kIy4x'*
private void quickSort(int[] data,int i,int j){
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int pivotIndex=(i+j)/2; 1vX97n<}
//swap YM5;mPR
SortUtil.swap(data,pivotIndex,j); qLcs)&}/A
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int k=partition(data,i-1,j,data[j]); 3t8VH`!mL{
SortUtil.swap(data,k,j); 1%>/%eyn5
if((k-i)>1) quickSort(data,i,k-1); -&+[/
if((j-k)>1) quickSort(data,k+1,j); 1Ztoj}!I
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} O5E \#*<K
/** u-8,9
* @param data D&.+Dx^G
* @param i LnLuWr<;}
* @param j o_{-X 1w
* @return t)5bHVx
*/ O
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private int partition(int[] data, int l, int r,int pivot) { Qax=_[r
do{ BeBa4s
while(data[++l] while((r!=0)&&data[--r]>pivot); *S7<QyVh
SortUtil.swap(data,l,r); X'O3)Yg
} Wq]^1g_
while(l SortUtil.swap(data,l,r); M4`qi3I
return l; -_B*~M/vV`
} ,XR1N$LN8_
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} [V
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改进后的快速排序: L,BuzU[1S
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package org.rut.util.algorithm.support; PyK)ks!6
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import org.rut.util.algorithm.SortUtil; y%f'7YZ4
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/** d7A vx
* @author treeroot 67^?v)|
* @since 2006-2-2 N_wB
* @version 1.0 WS4Ja$*
*/ L2+~I<|>
public class ImprovedQuickSort implements SortUtil.Sort { }qxwNmx
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private static int MAX_STACK_SIZE=4096; Ub3^Js!b%
private static int THRESHOLD=10; IvO#tI
/* (non-Javadoc) Tw8$6KUW
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) M/T
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*/ BVU>M*k
public void sort(int[] data) { q9|'!m5K
int[] stack=new int[MAX_STACK_SIZE]; ]%pr1Ey
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int top=-1; mSr(PIH{\
int pivot; s>ilxLSX]
int pivotIndex,l,r; n2cb,b/7
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stack[++top]=0; ^i:%0"[*^i
stack[++top]=data.length-1; qi!+Ceo}
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while(top>0){ G?*)0`~W
int j=stack[top--]; lG6P+ Z/nf
int i=stack[top--]; 'a[|'
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pivotIndex=(i+j)/2; @X5F$=aqZr
pivot=data[pivotIndex]; d[=~-[
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SortUtil.swap(data,pivotIndex,j); WWZ`RY
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//partition br`cxgZ0"
l=i-1; ?NWc3 .
r=j; -Q9} gaH_
do{ ;<hLy(@
while(data[++l] while((r!=0)&&(data[--r]>pivot)); <*oTVl4fS
SortUtil.swap(data,l,r); lk;4l Z
} m7!Mstu
while(l SortUtil.swap(data,l,r); n3y`='D
SortUtil.swap(data,l,j); 6fY-DqF!
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if((l-i)>THRESHOLD){ MfNsor
stack[++top]=i; SJ8Ax_9{q
stack[++top]=l-1; ~Z-o2+xA
} "n'kv!?\
if((j-l)>THRESHOLD){ )B)ecJJ_
stack[++top]=l+1; t>Lq
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stack[++top]=j; n<3qr}ZG^
} qjDt6B^RO
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} ?h\fwF3
//new InsertSort().sort(data); mBN+c9n/
insertSort(data); =S#9\W&