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快速排序: B4 bB`r
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package org.rut.util.algorithm.support; 8P]nO+
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import org.rut.util.algorithm.SortUtil; x@X2r
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/** o0WwlmB5
* @author treeroot :@(1~Hm
* @since 2006-2-2 6TRLHL~B
* @version 1.0 7a[6@
*/ jd]L}%ax
public class QuickSort implements SortUtil.Sort{ N_G&nw
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/* (non-Javadoc) KXZG42w
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) LYAGpcG
*/ <hzHrx'o{
public void sort(int[] data) { Cuylozj$&
quickSort(data,0,data.length-1); r'ilJ("
} "d}']M?-h
private void quickSort(int[] data,int i,int j){ ,t_&tbf3
int pivotIndex=(i+j)/2; *BxU5)O
//swap ; &rxwL
SortUtil.swap(data,pivotIndex,j); .joC ZKO
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int k=partition(data,i-1,j,data[j]); HFB>0<$
SortUtil.swap(data,k,j); e'~Qe_
if((k-i)>1) quickSort(data,i,k-1); <Z[Z&^
if((j-k)>1) quickSort(data,k+1,j); SN|!FW.*:
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} }<kl3{)
/** JQLQS
* @param data P|1 D6
* @param i RrLj5 Jq
* @param j _9-;35D_
* @return _W@sFv%sj
*/ xTk6q*NvT^
private int partition(int[] data, int l, int r,int pivot) { [#wt3<d`)
do{ 3N]ushMO
while(data[++l] while((r!=0)&&data[--r]>pivot); b+Sj\3fX
SortUtil.swap(data,l,r); !pfpT\i]N:
} C!_=L?QT^
while(l SortUtil.swap(data,l,r); eG+$~\%Fub
return l; (]k Q9}8
} S#CaJ}M
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} Vuy%7H
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改进后的快速排序: /?BTET
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package org.rut.util.algorithm.support; irh Z
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import org.rut.util.algorithm.SortUtil; nUs=PD3)
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/** m5/]+xdNX
* @author treeroot [4EIy"
* @since 2006-2-2 f7zB_hVDmE
* @version 1.0 V(XU^}b#
*/ Mmgm6{
public class ImprovedQuickSort implements SortUtil.Sort {
Ce//;Op
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private static int MAX_STACK_SIZE=4096; ,nog6\
private static int THRESHOLD=10; 5k=04=Iyh#
/* (non-Javadoc) G(A7=8vW
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) d~.hp
*/ #_Uo^Mw
public void sort(int[] data) { /g0' +DP
int[] stack=new int[MAX_STACK_SIZE]; <bn|ni|c"
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int top=-1; .`*(#9(M9
int pivot; )%9:k9
int pivotIndex,l,r; H [M:iV
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stack[++top]=0; .R)Ho4CE
stack[++top]=data.length-1; jn]l!nm
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while(top>0){ U e-AF#
int j=stack[top--]; FYNUap,A
int i=stack[top--]; >;G7ty[RX7
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pivotIndex=(i+j)/2; LvGo$f/9
pivot=data[pivotIndex]; "tb KbFn9
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SortUtil.swap(data,pivotIndex,j); p]e.E`'S
* W"Pv,:
//partition xhCNiYJ|
l=i-1; qU&v50n
r=j; fyZtwl@6w#
do{ dXWG`G_
while(data[++l] while((r!=0)&&(data[--r]>pivot)); E-X02A
SortUtil.swap(data,l,r); kQ[23
} 6."|m+D
while(l SortUtil.swap(data,l,r); R4D$)D
SortUtil.swap(data,l,j); >7?Lq<H
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if((l-i)>THRESHOLD){ F&k<