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快速排序: 69[V <1
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package org.rut.util.algorithm.support; A$9q!Ui#d
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import org.rut.util.algorithm.SortUtil; 0(Y%,q
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/** )3]83:lD2
* @author treeroot @@xO+$6
* @since 2006-2-2 Fa sI'Ulk
* @version 1.0 U;';"9C2>
*/ jo,6Aog|u
public class QuickSort implements SortUtil.Sort{ xZ^ywa_
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/* (non-Javadoc) \g~ws9'~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _L*f8e8
*/ #joF{M{
public void sort(int[] data) { 2UU2Vm_6
quickSort(data,0,data.length-1); +Fk4{p
} C+/Eqq^(
private void quickSort(int[] data,int i,int j){ NniX/fk
int pivotIndex=(i+j)/2; a);O3N/*I
//swap { A:LAAf[6
SortUtil.swap(data,pivotIndex,j); #'J~Xk
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int k=partition(data,i-1,j,data[j]); ?*CRa$_I|
SortUtil.swap(data,k,j); sTd}cP
if((k-i)>1) quickSort(data,i,k-1); &q4ox7 1
if((j-k)>1) quickSort(data,k+1,j); /QrA8
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} JZ %`%rA
/** W.yV/fu
* @param data vx04h ~
* @param i &e%{k@
* @param j @
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* @return H,(F1+~d
*/ 96vj)ql
private int partition(int[] data, int l, int r,int pivot) { qAUaF;{
do{ ge^!F>whr
while(data[++l] while((r!=0)&&data[--r]>pivot); h^%GE;N
SortUtil.swap(data,l,r); =RQ )$ %
} IM[54_I
while(l SortUtil.swap(data,l,r); 8BHL
return l; /t$rX3A
} utq.r_
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} V)2"l"Kt
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改进后的快速排序: &\&'L|0F
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package org.rut.util.algorithm.support; `ifb<T
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import org.rut.util.algorithm.SortUtil; ?O!]8k`1$
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/** uPFRh~ (b
* @author treeroot G5!|y#T
* @since 2006-2-2 B`LD7]ew
* @version 1.0 53bM+
*/ CIIY|DI`l
public class ImprovedQuickSort implements SortUtil.Sort { Lqg]Fd
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private static int MAX_STACK_SIZE=4096; $=\d1%_R|
private static int THRESHOLD=10; grGhN q
/* (non-Javadoc) `f%&<,i
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) A)OdQFet(
*/ fG<Dh z@
public void sort(int[] data) { 9Kc0&?q@D
int[] stack=new int[MAX_STACK_SIZE]; !K!)S^^Po?
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int top=-1; DD2adu^
int pivot; )i&%cyZw
int pivotIndex,l,r; \'[3^/('
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stack[++top]=0; )r=9]0=
stack[++top]=data.length-1; "PMO
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while(top>0){ |drf"lX<{
int j=stack[top--]; R'Sa?6xS4
int i=stack[top--]; R_maNfS]Z
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pivotIndex=(i+j)/2; NK 8<=
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pivot=data[pivotIndex]; pzi q0
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SortUtil.swap(data,pivotIndex,j); X{`1:c'x
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//partition z{=v)F5y
l=i-1; ;I+H>$%jZ
r=j; 07FT)QTE
do{ cW; H!:&
while(data[++l] while((r!=0)&&(data[--r]>pivot)); !j0_
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SortUtil.swap(data,l,r); ,m:L2 -J@
} C s#w72N
while(l SortUtil.swap(data,l,r); bJwc1AJgH
SortUtil.swap(data,l,j); ]
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if((l-i)>THRESHOLD){ x)_r@l`$ix
stack[++top]=i; |kc@L`7s
stack[++top]=l-1;
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} Lc%xc`n8B
if((j-l)>THRESHOLD){ {yS;NU`2
stack[++top]=l+1; _4v"")Xe
stack[++top]=j; @D]lgq[
} #|?8~c;RWG
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} XhN{S]Wn
//new InsertSort().sort(data); toIYE*ocv=
insertSort(data); nA+F
} {[P!$
/
/** :BD>yOlG
* @param data bcn7,ht
*/ '%&z.{
private void insertSort(int[] data) { |z*>ixK
int temp; j8a[
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); $UC {"0
} $w/E9EJ)3A
} mX;H((
} Cfv]VQQE
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} P0 b4Hq3
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