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快速排序: +'5I8FE-
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package org.rut.util.algorithm.support; ff R%@
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import org.rut.util.algorithm.SortUtil; 573,b7Yf
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/** }Md;=_TP
* @author treeroot -@_v@]:
* @since 2006-2-2 Q 318a0
* @version 1.0 1|"BpX~D
*/ T_D] rMl
public class QuickSort implements SortUtil.Sort{ .1;UEb|T
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/* (non-Javadoc) itirh"[
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,>b>I#{
*/ *IWW,@0
public void sort(int[] data) { 8 I_
quickSort(data,0,data.length-1); "|1iz2L
} 7M7Ir\d0lp
private void quickSort(int[] data,int i,int j){ IKPGqoM
int pivotIndex=(i+j)/2; sfr+W-7kx
//swap YK6'/2!
SortUtil.swap(data,pivotIndex,j); $qYP|W
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int k=partition(data,i-1,j,data[j]); B1!xr-kC
SortUtil.swap(data,k,j); >O24#!9XW
if((k-i)>1) quickSort(data,i,k-1); MomHSv Q\
if((j-k)>1) quickSort(data,k+1,j); 7p Y :.iVO
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} h
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/** OrM1eP"I
* @param data /QyKXg6)l
* @param i f4Y)GO<R]
* @param j 4%ooJi|)
* @return xR3$sA2
*/ Ws`ndR
private int partition(int[] data, int l, int r,int pivot) { /qIl)+M
do{ rq8 d}wj
while(data[++l] while((r!=0)&&data[--r]>pivot); lcm[l
SortUtil.swap(data,l,r); Z#H<+S(
} ]"{8"+x
while(l SortUtil.swap(data,l,r); W +ER'lX
return l; jmkOu5@
} /IRXk[
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} _,T
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改进后的快速排序: / 'qoKof
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package org.rut.util.algorithm.support; lh"*$.j-
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import org.rut.util.algorithm.SortUtil; _;;Zz&c
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/** m]AT-]*f
* @author treeroot edq,:
* @since 2006-2-2 OQKeU0v
* @version 1.0 rT/r"vr
*/ "hf
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public class ImprovedQuickSort implements SortUtil.Sort { ]9y\W}j
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private static int MAX_STACK_SIZE=4096; MHK|\Z&e7
private static int THRESHOLD=10; s||" } l
/* (non-Javadoc) ,u2Qkw
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) PY^#hC5:
*/ ^HJ?k:u
public void sort(int[] data) { WrGnLE
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int[] stack=new int[MAX_STACK_SIZE]; MqAi}z%
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int top=-1; 2Ckx.m &
int pivot; HTOr
int pivotIndex,l,r; &2`p#riAS
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stack[++top]=0; /qX?ca1_4^
stack[++top]=data.length-1; 'V]&X.=zC
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while(top>0){ ?FAI@4
int j=stack[top--]; !o /=,ZIx
int i=stack[top--]; Eu`|8# [ W
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pivotIndex=(i+j)/2; w]0@V}}u$o
pivot=data[pivotIndex]; 2aM7zP[Z
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SortUtil.swap(data,pivotIndex,j); R2Fjv@Egk
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//partition =+!l8o&o,
l=i-1; 3OZPy|".ax
r=j; K] (*l"'U5
do{ 1g{Pe`G,
while(data[++l] while((r!=0)&&(data[--r]>pivot)); C}RO'_Pq
SortUtil.swap(data,l,r); 3x0t[{l
} IFp%Ta
while(l SortUtil.swap(data,l,r); {6zNCO
SortUtil.swap(data,l,j); g F*AS(9
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if((l-i)>THRESHOLD){ Kp`{-dUf
stack[++top]=i; 5.9<g>C
stack[++top]=l-1; (aa2uctTn
} e|\xFV=4
if((j-l)>THRESHOLD){ VLez<Id9(
stack[++top]=l+1; sE pI)9
stack[++top]=j; \l~^dn}
} q<dG}aj
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} nF,F#V8l
//new InsertSort().sort(data); &<PIm
insertSort(data); l;lrf3
} G#n 4g:K
/** 0X=F(,>9
* @param data <&3P\aM>
*/ 4o*i(W
private void insertSort(int[] data) { ?*fY$93O
int temp; vk92j?
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); b6N[t _,
} S(zp_
} ;Bs~E
} C`[<6>&y
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} kFn/dQ4|
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