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快速排序: X(\RA.64
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package org.rut.util.algorithm.support; \!3='~2:=o
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import org.rut.util.algorithm.SortUtil; LmE-&
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/** p:jrqjLp
* @author treeroot mfvQ]tz_+
* @since 2006-2-2 x@=7M'vr%
* @version 1.0 ~cjvo?)&e;
*/ DI\sq8J^
public class QuickSort implements SortUtil.Sort{ Fwr,e;Z
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/* (non-Javadoc) EbQ} w"{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) X)~-MY*p
*/ iu 'yB
public void sort(int[] data) { :lAR;[WFS
quickSort(data,0,data.length-1); (hoqLL\}k
} xjYFTb}!
private void quickSort(int[] data,int i,int j){ >/*\xg&J
int pivotIndex=(i+j)/2; <#UvLll
//swap `t
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SortUtil.swap(data,pivotIndex,j); 7o<RvM
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int k=partition(data,i-1,j,data[j]); z,tax`O
SortUtil.swap(data,k,j); _!CH
if((k-i)>1) quickSort(data,i,k-1); -]e@cevy
if((j-k)>1) quickSort(data,k+1,j); jv ";?*I6.
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} Sv ,_G'
/** *sTQ9 Kr
* @param data ]:;gk&P
* @param i bpzA '
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* @param j gS%J`X$
* @return @;0Ep0[
*/ -3fvO~
private int partition(int[] data, int l, int r,int pivot) { P1kd6]s
do{ [ ,dsVd
while(data[++l] while((r!=0)&&data[--r]>pivot); :MVD83?4
SortUtil.swap(data,l,r); a'Z"Yz^Eo
} OQq7|dZu
while(l SortUtil.swap(data,l,r); F2&KTK
return l; G>Q{[m$
} L`\ILJz
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} iAN#TCwLT7
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改进后的快速排序: ,oCr6 ]
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package org.rut.util.algorithm.support; _
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import org.rut.util.algorithm.SortUtil; 6Z$T&Ul{
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/** `{ /tx!
* @author treeroot y&
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* @since 2006-2-2 C8?/$1|RL
* @version 1.0 +#W5Qb}VR
*/ mUjA9[@
public class ImprovedQuickSort implements SortUtil.Sort { oDC3AK&
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private static int MAX_STACK_SIZE=4096; W `Soa&9
private static int THRESHOLD=10; ZA!vxQ?P,
/* (non-Javadoc) Q~9:}_@
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) v1}
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*/ _]\mh,}
public void sort(int[] data) { ,=mn*
int[] stack=new int[MAX_STACK_SIZE]; 43eGfp'
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int top=-1; [L 8gG.wy
int pivot; u!Z&c7kPI
int pivotIndex,l,r; 7
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stack[++top]=0; 8S0)_L#S
stack[++top]=data.length-1; w4OVfTlN
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while(top>0){ .(sT?M`\J
int j=stack[top--]; (i`DUF'#y
int i=stack[top--]; Eb.{M
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pivotIndex=(i+j)/2; O:#to
pivot=data[pivotIndex]; m,pDjf
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SortUtil.swap(data,pivotIndex,j); !v^D
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//partition os>|LPv4
l=i-1; 9TF[uC)-2
r=j; DI*xf
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do{ a`T{5*@
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 0q/g:"|j
SortUtil.swap(data,l,r); ,xGlWH wrY
} P6X 4m(t
while(l SortUtil.swap(data,l,r); NE(6`Wq`
SortUtil.swap(data,l,j); 4'{j'kuv
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if((l-i)>THRESHOLD){ t0wLj}"U
stack[++top]=i; fD!O
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stack[++top]=l-1;
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} L<E`~\C'
if((j-l)>THRESHOLD){ bNqjjg
stack[++top]=l+1; Abj`0\
stack[++top]=j; Bdq/Ohw|!
} kJ~^
}o
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} Gm*i='f!?
//new InsertSort().sort(data); hX;xbl
insertSort(data); KB-7]H
} VQX#P<
/** 6OVAsmE
* @param data 7OT}V}iP
*/ 3i7n"8\$
private void insertSort(int[] data) { Jx'p\*
int temp; =Y89X6
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); Jk`A }
} 5H<r I?
} N^)L@6
} ><$hFrR!
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} MJK L4 G
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