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快速排序: H,Ik&{@j
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package org.rut.util.algorithm.support; n>|7 k3
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import org.rut.util.algorithm.SortUtil; qC;1ND
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/** GI ~<clhf
* @author treeroot /xseI)y.B
* @since 2006-2-2 wAn}ic".b
* @version 1.0 ^qgOgu
*/ p(J,fus
public class QuickSort implements SortUtil.Sort{ (Z{&[h
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/* (non-Javadoc) <XAW-m9SC
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) W{6%Hhp
*/ djGzJLH
public void sort(int[] data) { +2WvGRC
quickSort(data,0,data.length-1); H/Wo~$
} I<v:xTor
private void quickSort(int[] data,int i,int j){ -kZOve|5
int pivotIndex=(i+j)/2; P*M$^p
//swap nm3/-Q},
SortUtil.swap(data,pivotIndex,j); xdqiogu e
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int k=partition(data,i-1,j,data[j]); &N^^[
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SortUtil.swap(data,k,j); C OC6H'F
if((k-i)>1) quickSort(data,i,k-1); :kMEL*
if((j-k)>1) quickSort(data,k+1,j); Wdp?<U
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} vI)-Zz[3
/** J#L"kz
* @param data Vu
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* @param i
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* @param j iCK p"(kf
* @return N Dt +m
*/ >^!qxb-
private int partition(int[] data, int l, int r,int pivot) { '=^$;3Z
do{ y66V`,e0
while(data[++l] while((r!=0)&&data[--r]>pivot); pMfP3G7V
SortUtil.swap(data,l,r); S9'8rn!_
} $cUTe
while(l SortUtil.swap(data,l,r); /N'|Vs,X
return l; l_`DQ8L`
} >#jfZ5t
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} 9*"Ae0ok1
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改进后的快速排序: T9,T'y>BD
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package org.rut.util.algorithm.support; zURob MpE#
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import org.rut.util.algorithm.SortUtil; 'W>Zr}:
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/** f T&>L
* @author treeroot RkW)B^#
* @since 2006-2-2 %#^)hX,+Q
* @version 1.0 Z6Owxqfht
*/ K:i{us`
public class ImprovedQuickSort implements SortUtil.Sort { mR OXwzL
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private static int MAX_STACK_SIZE=4096; T<\!7RnLc
private static int THRESHOLD=10; G31??L:<
/* (non-Javadoc) _ zh>q4M
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) .%iJin"
*/ ~qk5Mk4$
public void sort(int[] data) { ~sd+ch*
int[] stack=new int[MAX_STACK_SIZE]; D8b~-#
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int top=-1; |6mDooTy
int pivot; :YAxL J
int pivotIndex,l,r; KG5h$eM'
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stack[++top]=0; bkZ~O=uv$-
stack[++top]=data.length-1; )kq3q5*_
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while(top>0){ U!0 Qf7D
int j=stack[top--]; g7-=kmr|V
int i=stack[top--]; *t,J4c
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pivotIndex=(i+j)/2; K1F,M9 0]
pivot=data[pivotIndex]; &?-LL{W{
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SortUtil.swap(data,pivotIndex,j); :n4X>YL)
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//partition 3e<FlH{
l=i-1; 6"d^4L?
r=j; eTV%+
do{ Mk*&CNo3
while(data[++l] while((r!=0)&&(data[--r]>pivot)); Zv`j+b
SortUtil.swap(data,l,r); +&w=*IAKZ
} q
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while(l SortUtil.swap(data,l,r); XuQ7nlbnq
SortUtil.swap(data,l,j); KvFGwq"X
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if((l-i)>THRESHOLD){ sw(dd01a
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stack[++top]=i; :[#~,TW
stack[++top]=l-1; }P5zf$
}
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if((j-l)>THRESHOLD){ w_gPX0N}3n
stack[++top]=l+1; !_EaF`oh(
stack[++top]=j; Mbt}G|;8H7
} NbD"O8dL~E
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} y5X HJUTu
//new InsertSort().sort(data); gZ5E%']sT
insertSort(data); " iCR68e
} ]m#.MZe
/** 4)o_gm~6c4
* @param data :?Xd&u0){
*/ 5 W<\J
private void insertSort(int[] data) { x<0-'EF/S
int temp; G%a8'3d,
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); N}Ol`@@#h
} JY\8^}'9
} h48JpZ"
} :J3ZTyjb
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} n\nC.|_G@
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