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快速排序: &|{,4V0%A
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package org.rut.util.algorithm.support; .sR&9FH
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import org.rut.util.algorithm.SortUtil; S,tVOxs^
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/** s=~7m.m
* @author treeroot MJ"Mn^:/
* @since 2006-2-2 "A1yqK
* @version 1.0 "!/_h >
*/ re7\nZ<\|
public class QuickSort implements SortUtil.Sort{ iM/0Yp-v'>
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/* (non-Javadoc) >(6\ C
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) rnhf(K.{3
*/ 75}u
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public void sort(int[] data) { ?{z${ bD
quickSort(data,0,data.length-1); 0(g MR
} u[|S*(P
private void quickSort(int[] data,int i,int j){ z%dlajYm:
int pivotIndex=(i+j)/2; U?^|>cMr
//swap P_g0G#`4
SortUtil.swap(data,pivotIndex,j); T\s#-f[x
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int k=partition(data,i-1,j,data[j]); RHAr[$
SortUtil.swap(data,k,j); XXwhs-:o
if((k-i)>1) quickSort(data,i,k-1); q
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if((j-k)>1) quickSort(data,k+1,j); z+D,:!yF
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} I2lZ>3X{
/** ulSTR f
* @param data h%^kA@3F
* @param i Lpbn@y26<
* @param j RMt vEa
* @return _vLT!y
*/ WI!z92qq[
private int partition(int[] data, int l, int r,int pivot) { [k=9 +0p
do{ }Z?[Ut
while(data[++l] while((r!=0)&&data[--r]>pivot); Tc(v\|F,
SortUtil.swap(data,l,r); r=||sZs
} rtF6Lg
while(l SortUtil.swap(data,l,r); <r`Jn49
return l; >~>[}d;glw
} jTgh+j]AP
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} X$&Sw3c
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改进后的快速排序: ~+nSI-L
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package org.rut.util.algorithm.support; |#jm=rT0y
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import org.rut.util.algorithm.SortUtil; KdpJ[[Ug/
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/** *K.7Zf0
* @author treeroot CgKSK0/a
* @since 2006-2-2 ?N*@o.
* @version 1.0 Q4:r$
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*/ 0a%ui2k
public class ImprovedQuickSort implements SortUtil.Sort { 9S1V!Jp
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private static int MAX_STACK_SIZE=4096; w&cyGd D5
private static int THRESHOLD=10; uBkny;
/* (non-Javadoc) 7=*k@9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) K$GXXE`
*/ J+gsmP-_
public void sort(int[] data) { :{uUc
int[] stack=new int[MAX_STACK_SIZE]; s(.-bjR
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int top=-1; ~ A|*]0,
int pivot; /=(FM
int pivotIndex,l,r; t6e-~
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stack[++top]=0; (4{9
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stack[++top]=data.length-1; G&3<rT3Ib
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while(top>0){ r3vj o(
int j=stack[top--]; =F[,-B~
int i=stack[top--]; 2=M!lB
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pivotIndex=(i+j)/2; SZD2'UaG
pivot=data[pivotIndex]; 1AV1W_"
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SortUtil.swap(data,pivotIndex,j); r8>?-P
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//partition <Pt\)"JA
l=i-1; s9bP6N!,
r=j; )II,HT-LY
do{ *)D*iU&
while(data[++l] while((r!=0)&&(data[--r]>pivot)); kP@OIhRe
SortUtil.swap(data,l,r); OSIp
} R0d|j#vP
while(l SortUtil.swap(data,l,r); oXkhj,{y5
SortUtil.swap(data,l,j); /n7,B}
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if((l-i)>THRESHOLD){ c6)zx
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stack[++top]=i; KptLeb:Om
stack[++top]=l-1; ..TjEBp
} YDD]n*&
if((j-l)>THRESHOLD){ ADz|Y~V!
stack[++top]=l+1; +[[gU;U"v
stack[++top]=j; 3*JybMo"
} qW >J-,61/
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} &>fd:16
//new InsertSort().sort(data); e"/X*xA
insertSort(data); p<19 Jw<
} Z5-'|h$|
/** t O>qd#I
* @param data Lpf=VyqC
*/ ?EAqv]
private void insertSort(int[] data) { (Z +C
int temp; /U]5#'i
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); <);u]0
} Ec
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} )yZE>>3-
} QjU"|$
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} "iGc'?/+
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