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快速排序: ug]2wftlQ
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package org.rut.util.algorithm.support; ;:=j{,&dl[
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import org.rut.util.algorithm.SortUtil; a>vxox) %
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/** $?F_Qsy{d
* @author treeroot IrZjlnht
* @since 2006-2-2 YA,.C4=s
* @version 1.0 O.FTToh<
*/ gba1R
public class QuickSort implements SortUtil.Sort{ h~Ir=JV
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/* (non-Javadoc) F2zo
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) oqvu8"
*/ Ei:m@}g
public void sort(int[] data) { nN&dtjoF
quickSort(data,0,data.length-1); M;XU"8
} QyA^9@iVs
private void quickSort(int[] data,int i,int j){ #Tc`W_-
int pivotIndex=(i+j)/2; yreH/$Ou8
//swap 0 @#Jz#?
SortUtil.swap(data,pivotIndex,j); oPs asa
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int k=partition(data,i-1,j,data[j]); f=91
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SortUtil.swap(data,k,j); ,$!fyi[;C
if((k-i)>1) quickSort(data,i,k-1); D% *ww'mt0
if((j-k)>1) quickSort(data,k+1,j); gA=Pz[i)p
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} h*^JFZb
/** }*J04o$oI
* @param data M+")*Opq
* @param i Wg %]
* @param j }'vQUGu8z
* @return cl`kd)"v
*/ /mJb$5=1
private int partition(int[] data, int l, int r,int pivot) { \
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do{ \#biwX
while(data[++l] while((r!=0)&&data[--r]>pivot); 8cfsl lI
SortUtil.swap(data,l,r); yE
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} I 8i|tQz
while(l SortUtil.swap(data,l,r); V #vkj
return l; /QS Nv
} <,O|fY%
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}
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改进后的快速排序: BT(eU*m-
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package org.rut.util.algorithm.support; MA{ZmPm)
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import org.rut.util.algorithm.SortUtil; DPY+{5q2
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/** IHW s<U
* @author treeroot [6K[P3UZx
* @since 2006-2-2 4NRj>y
* @version 1.0 E
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*/ Lwtp,.)pR
public class ImprovedQuickSort implements SortUtil.Sort { 0xi2VN"X
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private static int MAX_STACK_SIZE=4096; ~rrl"a>
private static int THRESHOLD=10; "$5cKbJ
/* (non-Javadoc) QX?moW6UW
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) y z3=#
*/ ^VzhjKSu
public void sort(int[] data) { 7lYf+&JZ
int[] stack=new int[MAX_STACK_SIZE]; fvta<
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int top=-1; "w 4^i!\
int pivot; 43=)akJi
int pivotIndex,l,r; YpZuAJm<2_
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stack[++top]=0; \Dr( /n
stack[++top]=data.length-1; NHU5JSlB
L8E4|F}
while(top>0){ - ]/=WAOK
int j=stack[top--]; Wt5pK[JV
int i=stack[top--]; Z1$S(p=)L
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pivotIndex=(i+j)/2; MYJMZ3qBi
pivot=data[pivotIndex]; ?W dY{;&
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SortUtil.swap(data,pivotIndex,j); 3it*l-i\
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//partition q(46v`u
l=i-1; D
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r=j; Kl ?C[
do{ WOgkv(5KN
while(data[++l] while((r!=0)&&(data[--r]>pivot)); A]%*ye"NT
SortUtil.swap(data,l,r); PXl%"O%d
} Q4Wz5n1yp7
while(l SortUtil.swap(data,l,r); ?]*"S{Cq v
SortUtil.swap(data,l,j); lt'N{LFvc
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if((l-i)>THRESHOLD){ ]w*` }
stack[++top]=i; a_VWgPVdDS
stack[++top]=l-1; butBS
} B)d 4]]4\\
if((j-l)>THRESHOLD){ "Qc4v@~)
stack[++top]=l+1; Jzp|#*~$E
stack[++top]=j; $BLd>gTzmv
} /&qE,>hd.+
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} o*~=NoR
//new InsertSort().sort(data); mq}uq9<
insertSort(data); o=zl{tZV
} wqjR-$c
/** r~|7paX!
* @param data ^\S~rW.3_
*/ H7drDw
private void insertSort(int[] data) { \,m*CYs`
int temp; [\ 0>@j}Z
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); -:!Wds
} r|z B?9Q
} 00-2u~D&
} Om;`"5
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} K4RQ{fWpm
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