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快速排序: Stw%OP@?
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package org.rut.util.algorithm.support; 38I .1p9
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import org.rut.util.algorithm.SortUtil; h3}gg@Fm
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/** Q Pel n)
* @author treeroot ( !K?^si
* @since 2006-2-2 u{Z
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* @version 1.0
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*/ G4VdJ(_
public class QuickSort implements SortUtil.Sort{ :n@j"-HA
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/* (non-Javadoc) g$z9 ( i+
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) W.B;Dy,Y
*/ i4',d#
public void sort(int[] data) { {C% #r@6
quickSort(data,0,data.length-1); >EMsBX
} $]{20"
private void quickSort(int[] data,int i,int j){ &zGf`Zi6*%
int pivotIndex=(i+j)/2; Nb[zm|.
//swap R:Pw@
SortUtil.swap(data,pivotIndex,j); fR:BF47
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int k=partition(data,i-1,j,data[j]); oNkASAd
SortUtil.swap(data,k,j); |zJxR_)
if((k-i)>1) quickSort(data,i,k-1); \wyn
if((j-k)>1) quickSort(data,k+1,j); Y,?!"
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/** `cz%(Ry,
* @param data f3g#(1
* @param i uQ} 0hs
* @param j P|:*OM
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* @return sHt
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*/ XAn{xNpz
private int partition(int[] data, int l, int r,int pivot) { ucVWvXCr
do{ qIO<\Yl
while(data[++l] while((r!=0)&&data[--r]>pivot); s,tZi6Z=%E
SortUtil.swap(data,l,r); o@p(8=x
} PYOU=R%o`8
while(l SortUtil.swap(data,l,r);
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return l; r-r)'AAO
} mnZS](>
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改进后的快速排序: t *8k3"
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package org.rut.util.algorithm.support; )]\?Yyg]
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import org.rut.util.algorithm.SortUtil;
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/** ,wI$O8"!j
* @author treeroot w6B'&
* @since 2006-2-2 eHjna\ C
* @version 1.0 't3@dz_dG
*/ 0v~Eu>Rg
public class ImprovedQuickSort implements SortUtil.Sort { -T
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private static int MAX_STACK_SIZE=4096; N33{vx
private static int THRESHOLD=10; iva?3.t
/* (non-Javadoc) rO_|_nV[
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) VcLB0T7m\
*/ shjq4#9
public void sort(int[] data) { fn!(cE|`E
int[] stack=new int[MAX_STACK_SIZE]; Mp8FYPjZ
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int top=-1; r_5k$u(
int pivot; yNVmTb9mF
int pivotIndex,l,r; &_DRrp0CN
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stack[++top]=0; TAkM-iyH]
stack[++top]=data.length-1; sRM3G]nUr
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while(top>0){ Eyv|~D
int j=stack[top--]; &TpzJcd"
int i=stack[top--]; A3\%t@y
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pivotIndex=(i+j)/2; !hBzT7CO
pivot=data[pivotIndex]; __FhuP P
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SortUtil.swap(data,pivotIndex,j); !Q`vOVSUD
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//partition 3#IU^6l:1S
l=i-1; ^kS44pr\Q
r=j; R)%1GG4
do{ ]<V,5'xh
while(data[++l] while((r!=0)&&(data[--r]>pivot)); r N"P
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SortUtil.swap(data,l,r); i$Rlb5RU
} l&