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快速排序: HUtuU X
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package org.rut.util.algorithm.support; 1B;sSp.>
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import org.rut.util.algorithm.SortUtil; *1}'ZEaJ
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/** &41=YnC6
* @author treeroot s:UQ~p}"S
* @since 2006-2-2 V Z[[zYe
* @version 1.0 uJ4RjLM`
*/ $g55wG F
public class QuickSort implements SortUtil.Sort{ n;0bVVMV
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/* (non-Javadoc) aUN!Sd2,
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =3J&UQL
*/ 88
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public void sort(int[] data) { ;N4b~k)
quickSort(data,0,data.length-1); y8Bi5Ae,+1
} }MDu QP]
private void quickSort(int[] data,int i,int j){ ->x+ p"
int pivotIndex=(i+j)/2; is%qG?,P
//swap B1oy,'
SortUtil.swap(data,pivotIndex,j); dwKre#4F
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int k=partition(data,i-1,j,data[j]); _'k?9eN`
SortUtil.swap(data,k,j); =~% B}T
if((k-i)>1) quickSort(data,i,k-1); 7CzZHkTg
if((j-k)>1) quickSort(data,k+1,j); h5G>FPM-=
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} +! 6C^G
/** Cyxt EzPp
* @param data `5;O|qRq
* @param i #e0tT+
* @param j !6ZkLE[XJ<
* @return 3VbQDPG
*/ %Ysu613mz
private int partition(int[] data, int l, int r,int pivot) { +pJ;}+
do{ xQC.ap
while(data[++l] while((r!=0)&&data[--r]>pivot); A\Q]o#U
SortUtil.swap(data,l,r); w8*+l0
} ?w1_.m|8u
while(l SortUtil.swap(data,l,r); m&DDz+g
return l; B&_ 62`
} Ud0%O
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} '}*5ee](S
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改进后的快速排序: *Wv]DV=\
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package org.rut.util.algorithm.support; XB-pOtVm
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import org.rut.util.algorithm.SortUtil; e@s+]a8D-k
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/** :cop0;X:Wm
* @author treeroot pJx88LfR
* @since 2006-2-2 |n3PznV
* @version 1.0 Re('7m h~
*/ Xd>4n7nb$`
public class ImprovedQuickSort implements SortUtil.Sort { '8~7Ru\KyX
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private static int MAX_STACK_SIZE=4096; 3uCC_Am
private static int THRESHOLD=10; =*qu:f\y
/* (non-Javadoc) -<a~kVv
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) YMwMaU)K,
*/ eMVfv=&L<3
public void sort(int[] data) { b&A+`d
int[] stack=new int[MAX_STACK_SIZE]; L$h.VQv+
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int top=-1; |HJdpY>Uu
int pivot; q[Hxy
int pivotIndex,l,r; Nhn5 iN1*
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stack[++top]=0; Ze'AZF
stack[++top]=data.length-1; s,N%sO;
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while(top>0){ 3@?#4]D{'
int j=stack[top--]; ,)XT;iGQe
int i=stack[top--]; Y:]~~-f\~
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pivotIndex=(i+j)/2; ZPn`.Qc
pivot=data[pivotIndex]; ]v@#3,BV
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SortUtil.swap(data,pivotIndex,j); C<2vuZD
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//partition 0]{h,W3]@[
l=i-1; @"-<m|lM
r=j; %xf6U>T
do{ 4s~YqP{K
while(data[++l] while((r!=0)&&(data[--r]>pivot)); IP$^)t[
SortUtil.swap(data,l,r); ~" B0P>7
} qr$=oCqa
while(l SortUtil.swap(data,l,r); Yva^JB
SortUtil.swap(data,l,j); 3'O+
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if((l-i)>THRESHOLD){ !zwnFdp
stack[++top]=i; m;lwMrY\7>
stack[++top]=l-1; U;:>vi3p
} 07Yh
if((j-l)>THRESHOLD){ {QTfD~z^K
stack[++top]=l+1; ^Qrdh0j
stack[++top]=j; *nluK
} x
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} FD*`$.e3\
//new InsertSort().sort(data); >IC.Zt@
insertSort(data); bT*MJ7VVm
} ]]Ypi=<'
/** tXcc#!'4C
* @param data v&i M/pJU
*/ u }D.yI8
private void insertSort(int[] data) { rv1kIc5Za<
int temp; 2J^6(vk
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); U5z^R>k
} y. @7aT5
} /}-]n81m
} o8BbSZVu
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} RtGETiA\b
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