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快速排序: XuA0.b%
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package org.rut.util.algorithm.support; ul}4p{ m[
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import org.rut.util.algorithm.SortUtil; tvK rc
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/** |zg=+
* @author treeroot *di&%&f
* @since 2006-2-2 I"~xDa!
* @version 1.0 EOofa6f&l
*/ HI7]%<L
public class QuickSort implements SortUtil.Sort{ 6@i|Kw(:
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/* (non-Javadoc) ?@yank|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 0LZ=`tI
*/ [Aa[&RX+9
public void sort(int[] data) { +q$xw}+PK
quickSort(data,0,data.length-1); hw7~i
} Cd$dnHVh
private void quickSort(int[] data,int i,int j){ ]gjr+GV
int pivotIndex=(i+j)/2; .$n$%|"H-
//swap w
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SortUtil.swap(data,pivotIndex,j); aViJ
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int k=partition(data,i-1,j,data[j]); <e$5~Spc
SortUtil.swap(data,k,j); HIQ]"Hl
if((k-i)>1) quickSort(data,i,k-1); Q>##hG:m
if((j-k)>1) quickSort(data,k+1,j); :Xh_$4~^Y
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} =I
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/** fpI;`s
* @param data ;*n_N!v
* @param i pE~9o 9
* @param j [BJ$|[11
* @return ,s\x]bh
*/ Qo]vpp^[#
private int partition(int[] data, int l, int r,int pivot) { ^mS.HT=X
do{ EKV+?jj$
while(data[++l] while((r!=0)&&data[--r]>pivot); ^cfkP(Y3kx
SortUtil.swap(data,l,r); n.=e)*
} o",f(v&u%
while(l SortUtil.swap(data,l,r); Tyg$`\#
return l; /h1dm,
} Fc34Y0_A
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} ]Y?{$M
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改进后的快速排序: !hwzKm=%N
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package org.rut.util.algorithm.support; 4Z<]4:o
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import org.rut.util.algorithm.SortUtil; z"
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/** V:nMo2'hb
* @author treeroot *#ob5TBq[
* @since 2006-2-2 9;>@"e21R
* @version 1.0 6M
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*/ hr)+Pk
public class ImprovedQuickSort implements SortUtil.Sort { BG(R=,
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private static int MAX_STACK_SIZE=4096; jh<TdvF2$
private static int THRESHOLD=10; #i}# jMT
/* (non-Javadoc) i*mZi4URN
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
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*/ u|]mcZ,ZW
public void sort(int[] data) { ]
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int[] stack=new int[MAX_STACK_SIZE]; J3]qg.B%z
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int top=-1; krEH`f
int pivot; Jdk3)
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int pivotIndex,l,r; bIvJs9L
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stack[++top]=0; BLl%D
stack[++top]=data.length-1; Fi,e}j=2f
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while(top>0){ v#FJ+
int j=stack[top--]; {<''OwQF~+
int i=stack[top--]; &KOG[tv
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pivotIndex=(i+j)/2; sw 3:HNG=
pivot=data[pivotIndex]; >
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SortUtil.swap(data,pivotIndex,j); doxdRYKL
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//partition P3,Z5|)
l=i-1; F]URf&U
r=j; t z
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do{ pXpLL_
while(data[++l] while((r!=0)&&(data[--r]>pivot)); XwKZv0ub
SortUtil.swap(data,l,r); kuKnJWv
} tu?Z@W/
while(l SortUtil.swap(data,l,r); -Fp!w "=T
SortUtil.swap(data,l,j); oP43 NN~
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if((l-i)>THRESHOLD){ PsF- 9&_
stack[++top]=i; @1J51< x
stack[++top]=l-1; FOlA* U4U
} yi
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if((j-l)>THRESHOLD){ -@gJqoo>
stack[++top]=l+1; qb>|n1F_
stack[++top]=j; !9e\O5PmO
} P!)7\.7
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} ( 7rz:
//new InsertSort().sort(data); `[C v-
insertSort(data); z1{E:~f
} a6#{2q
/** p ?Ij-uo"o
* @param data WcZo+r
*/ *tbpFk4/
private void insertSort(int[] data) { A/Fs?m{7U
int temp; yPzULO4
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); I9Edw]
} FJn~
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} ;QvvU[eb
} laD.or
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} %(dV|,|v
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