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快速排序: z?xd\x
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package org.rut.util.algorithm.support;
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import org.rut.util.algorithm.SortUtil; c/RG1w
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/** f&'md
* @author treeroot -5K/ cK
* @since 2006-2-2 2X`M&)"X
* @version 1.0 Yi`.zm
*/ 1Jt%I'C?
public class QuickSort implements SortUtil.Sort{ $.Ni'U
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/* (non-Javadoc) uvL|T48
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 0/$sr;
*/ S%2qB;uw
public void sort(int[] data) { UpILr\3U
quickSort(data,0,data.length-1); Eh+lLtZ
} vq}V0-
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private void quickSort(int[] data,int i,int j){ J']W7!p
int pivotIndex=(i+j)/2; _PF><ODX2
//swap V]2Q92
SortUtil.swap(data,pivotIndex,j); -84Z8?_
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int k=partition(data,i-1,j,data[j]); gE1" .qC
SortUtil.swap(data,k,j); y06 2/$*$
if((k-i)>1) quickSort(data,i,k-1); !k:j+h/
if((j-k)>1) quickSort(data,k+1,j); sp%7iNs
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} y3#\mBiw
/** 4/b#$o<I?
* @param data ~X/T6(n$
* @param i [>E0(S]
* @param j IWkBq]Y
* @return })B)-8
*/ ^:BRbp37i
private int partition(int[] data, int l, int r,int pivot) { \MU4"sXw
do{ lk80)sTZ
while(data[++l] while((r!=0)&&data[--r]>pivot); hY!G>d{J
SortUtil.swap(data,l,r); kcle|B
} +] #>6/2q
while(l SortUtil.swap(data,l,r); V4 7Fp
return l; @azS)4L
} WKG=d]5
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} deNU[
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改进后的快速排序: 2rxdRg'YLQ
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package org.rut.util.algorithm.support; (H$eXW7
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import org.rut.util.algorithm.SortUtil; 2.6,c$2tB
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/** x\*5A,w{c]
* @author treeroot O1z>A
* @since 2006-2-2 =c|Bu^(Ctw
* @version 1.0 =xgW$c/yB
*/ ;(XSw%Y
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public class ImprovedQuickSort implements SortUtil.Sort { SV.*Z|"^N
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private static int MAX_STACK_SIZE=4096; , Le_PJY)
private static int THRESHOLD=10; n}l Z
/* (non-Javadoc) HBt?cA '
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &5B+8>
*/ Z"n]y4h
public void sort(int[] data) { [-l^,,E
int[] stack=new int[MAX_STACK_SIZE]; 8)i\d`
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int top=-1; G
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int pivot; _?{2{^v
int pivotIndex,l,r; &rn,[w_F[
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stack[++top]=0; L8V'mUyD
stack[++top]=data.length-1; CTwP{[%Pk
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while(top>0){ `]%{0 Rx
int j=stack[top--]; @y,p-##e
int i=stack[top--]; '!_o`t@
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pivotIndex=(i+j)/2; Qwb@3{
pivot=data[pivotIndex]; @-hy:th#
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SortUtil.swap(data,pivotIndex,j); 4EOu)#
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//partition 69_c,(M0
l=i-1; (vQShe\
r=j; C. Sb4i*
do{ ]|-y[iu
while(data[++l] while((r!=0)&&(data[--r]>pivot)); %hXa5}JL
SortUtil.swap(data,l,r); Y$(G)Fs
} w'UP#vT5&
while(l SortUtil.swap(data,l,r); |_O1V{Q=
SortUtil.swap(data,l,j); n44j]+P
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if((l-i)>THRESHOLD){ 3,pRmdC
stack[++top]=i; I!bG7;=_
stack[++top]=l-1; m8FKr/Z-
} o}[wu:>yk
if((j-l)>THRESHOLD){ 1f}Dza9
stack[++top]=l+1; a1?Y7(alPU
stack[++top]=j; }b1P!xb!A
} +ux,cx.U"
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} 7Q^t(
//new InsertSort().sort(data); vZ*593C8
insertSort(data); -q-%)f
} k(T/ydrw
/** _mcD*V
* @param data 9;:Lf
*/ xEbcF+@
private void insertSort(int[] data) { \wTWhr0
int temp; HSTtDTo
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); V;>p@uE,P
} `LNRl'Zm
} ~x824xW
} ll6~8PN
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