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快速排序: >?jmeD3u
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package org.rut.util.algorithm.support; (@NW2
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import org.rut.util.algorithm.SortUtil; kvN<o-B
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/** +bk+0k9k5
* @author treeroot xD9ZL
* @since 2006-2-2 {8556> \~
* @version 1.0 ybv]wBpM:
*/ >@EwfM4[e
public class QuickSort implements SortUtil.Sort{ }_D{|!!!T
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/* (non-Javadoc) XO5E-Nh
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \Rw^&;\1
*/ LhSXz>AX
public void sort(int[] data) { TVVu_ib
quickSort(data,0,data.length-1); D7Y?$=0ycb
} 69 J4p=c,
private void quickSort(int[] data,int i,int j){ I:WPP'L4o
int pivotIndex=(i+j)/2; a1x].{
//swap qE.3:bQ!`
SortUtil.swap(data,pivotIndex,j); S`& yVzv
k>=wwPy
int k=partition(data,i-1,j,data[j]); >:OP+Vc
SortUtil.swap(data,k,j); zVis"g`
if((k-i)>1) quickSort(data,i,k-1); P]7s1kgaS
if((j-k)>1) quickSort(data,k+1,j); ZU`HaL$
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} 9hgIQl
/** 1[-RIN;U8
* @param data rIX 40,`
* @param i !Pu7%nV.
* @param j x[R?hS,0t
* @return X;v{,P=J
*/ 4M;S&LA
private int partition(int[] data, int l, int r,int pivot) { Pr,C)uch
do{ X7SSTcA
while(data[++l] while((r!=0)&&data[--r]>pivot); 88}0 4
SortUtil.swap(data,l,r); 2<*Yq8
} mhF@S@
while(l SortUtil.swap(data,l,r); _)~|Z~
return l; &zPM#Q
} u1|v3/Q-
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} &{8[I3#@
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改进后的快速排序: I]B9+Z?xo
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package org.rut.util.algorithm.support; iig&O(,
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import org.rut.util.algorithm.SortUtil; mo]>Um'F
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/** 9lX[rBZ
* @author treeroot 9Dyw4'W.N
* @since 2006-2-2 NM1TFs2Y*
* @version 1.0 :~p_(rE
*/ T{
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public class ImprovedQuickSort implements SortUtil.Sort { ^.M_1$-
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private static int MAX_STACK_SIZE=4096; 17VNw/Y
private static int THRESHOLD=10; 0.#%KfQ
/* (non-Javadoc) zu1gP/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Xg;q\GS/<i
*/ &WdP=E"
public void sort(int[] data) { >P6U0
int[] stack=new int[MAX_STACK_SIZE]; ! &V,+}>)
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int top=-1; 5;9.&f
int pivot; eoPoGC
int pivotIndex,l,r; mW)"~sA
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stack[++top]=0; 'YEiT#+/
stack[++top]=data.length-1; e co=ia
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while(top>0){ *gI9CVfQl
int j=stack[top--]; 5JZZvc$au
int i=stack[top--]; [ HjGdC
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pivotIndex=(i+j)/2; C,u;l~zz
pivot=data[pivotIndex]; tI2p-d9B
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SortUtil.swap(data,pivotIndex,j); *8 ]
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//partition CjA}-ee
l=i-1; w2tkJcQ3
r=j; '`p0T%w
do{ vaZ?>94
while(data[++l] while((r!=0)&&(data[--r]>pivot)); BimM)4g
SortUtil.swap(data,l,r); U3w*z6OG
} r3.v ^
while(l SortUtil.swap(data,l,r); qxD<mZ@-R0
SortUtil.swap(data,l,j); wSs78c=
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if((l-i)>THRESHOLD){ zyI4E\
stack[++top]=i; x[%% )[d
stack[++top]=l-1; =`%%*
} ,@2d4eg4
if((j-l)>THRESHOLD){ CY9`HQ1
stack[++top]=l+1; JDC,]
stack[++top]=j; J15$P8J
} .LNqU#a
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} [g*]u3s
//new InsertSort().sort(data); u"a$/
insertSort(data); bRAf!<3
} NPR{g!tK%
/** !!t@H\
* @param data 7h/{F({r=
*/ o=(>#iVM
private void insertSort(int[] data) { [ \Aor[(
int temp; fI0L\^b%
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); gClDVO
} kC[nY
} |zL .PS
} Xq%!(YD|
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} ~
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