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快速排序: 2fp\s5%J}
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package org.rut.util.algorithm.support; F%!ZHE7
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import org.rut.util.algorithm.SortUtil; j8*fa
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/** h~rSM#7m
* @author treeroot hO3>Gl5<
* @since 2006-2-2 `N%q^f~
* @version 1.0 3zV{cm0
*/ ~,199K#'
public class QuickSort implements SortUtil.Sort{ f$\gm+&hXE
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/* (non-Javadoc) XeGtge/}T
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) !F@9xG
*/ GqYE=Q
public void sort(int[] data) { "mBX$t'gb
quickSort(data,0,data.length-1); }p2YRTH x
} ;cye
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private void quickSort(int[] data,int i,int j){ #!a}ZhIt
int pivotIndex=(i+j)/2; b+Ly%&
//swap DOk(5gR
SortUtil.swap(data,pivotIndex,j); O@$wU9D<
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int k=partition(data,i-1,j,data[j]); z?9vbx
SortUtil.swap(data,k,j); ]z^*1^u^ig
if((k-i)>1) quickSort(data,i,k-1); /hNZ7\|P
if((j-k)>1) quickSort(data,k+1,j); TB!z:n
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} 3,x|w
/** WyO7,Qr\
* @param data 7RH1,k
* @param i g~>g])
* @param j O@[jNs)].
* @return y;M}I8W[
*/ b.Yl0Y
private int partition(int[] data, int l, int r,int pivot) { )#NT* @j`
do{ O.ce"5Y^
while(data[++l] while((r!=0)&&data[--r]>pivot); BCrX>Pp}r
SortUtil.swap(data,l,r); gj\'1(Ju
} nUgZ]ag=G
while(l SortUtil.swap(data,l,r); -AJ$-y
return l; Nb[zm|.
} ;w\7p a
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} ?1DA
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改进后的快速排序: @xO?SjH
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package org.rut.util.algorithm.support; 47GL[ofY
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import org.rut.util.algorithm.SortUtil; ucVWvXCr
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/** MS_@
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* @author treeroot *@E Itj `
* @since 2006-2-2 efK3{
* @version 1.0 3!+N}[$iy
*/ AU3Ou5
public class ImprovedQuickSort implements SortUtil.Sort { GzC=xXON
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private static int MAX_STACK_SIZE=4096; 1l8kuwH
private static int THRESHOLD=10; e:h(,
/* (non-Javadoc) FN25,Q8:*I
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) oj8_e xx
*/ y .+d3
public void sort(int[] data) { VcLB0T7m\
int[] stack=new int[MAX_STACK_SIZE]; &8l4A=l$
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int top=-1; 7]i=eD8
int pivot; gypE~@
int pivotIndex,l,r; 4f}:)M$5
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stack[++top]=0; E(0(q#n
stack[++top]=data.length-1; eH*u,/
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while(top>0){ 'CrBxaA]s
int j=stack[top--]; rvdhfM!-A
int i=stack[top--]; x vi&d1
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pivotIndex=(i+j)/2; l~Em2@c
pivot=data[pivotIndex]; LX
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SortUtil.swap(data,pivotIndex,j); :HJ@/s!J
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//partition #WOb&h
l=i-1; q ;@:,^
r=j; Is87
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do{ qep<7 QO
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ,O9rL :?
SortUtil.swap(data,l,r); A[,[j?wC
} m&'z|eN
while(l SortUtil.swap(data,l,r); xJ;DkPh
SortUtil.swap(data,l,j); [n53eC
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if((l-i)>THRESHOLD){ <lx~/3<m
stack[++top]=i; 0@ -3U{Q
stack[++top]=l-1; a]-.@^:_i
} ]Z@+
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if((j-l)>THRESHOLD){ jY]hMQ/H
stack[++top]=l+1; ~[J&n-bJU
stack[++top]=j; w% Ug9
} )N) "O? W9
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} ozs
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//new InsertSort().sort(data); zH0{S.3k
insertSort(data); Lv;R8^n
} `.0QY<;
/** k)2L<Lmn
* @param data u-CC UMR
*/ 67uUeCW
private void insertSort(int[] data) { </K"\EU
int temp; -L9I;]:KY
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ODGOWw0
} 9s5PJj "u
} UTatcn
} :v_H;UU
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} 9d7$Fz#
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