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快速排序: S!+}\*
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package org.rut.util.algorithm.support; 6_kv~`"t Z
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import org.rut.util.algorithm.SortUtil; `(o:;<&3
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/** aV`_@F-8
* @author treeroot oZ,_ G,b^
* @since 2006-2-2 'CA{>\F$F+
* @version 1.0 |!E: [UH
*/ 6g&Ev'
public class QuickSort implements SortUtil.Sort{ F;sZc,Y,^
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/* (non-Javadoc) 0Tq=nYZA
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) P:&X1MC
*/ 6,a:s:$>}R
public void sort(int[] data) {
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quickSort(data,0,data.length-1); JK'FJ}Z4
} Yh2[
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private void quickSort(int[] data,int i,int j){ ,u_ Z0S M
int pivotIndex=(i+j)/2; z1S
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//swap Zi=/w
SortUtil.swap(data,pivotIndex,j); H<Ik.]m
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int k=partition(data,i-1,j,data[j]); BnUWg ^E
SortUtil.swap(data,k,j); x7ZaI{
if((k-i)>1) quickSort(data,i,k-1); Cd2A&RB
if((j-k)>1) quickSort(data,k+1,j); \45F;f_r6
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} ,8G6q_ud
/** #gsJ
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* @param data H5>?{(m
* @param i Gy)2
* @param j "Tz'j}< 9C
* @return #ADm^UT^
*/ 1V.oR`&2E
private int partition(int[] data, int l, int r,int pivot) { @8*lqV2
do{ 6|n3e,&A2
while(data[++l] while((r!=0)&&data[--r]>pivot); 5y8VA4L/o
SortUtil.swap(data,l,r); ]Bj2; <@y
} HT
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while(l SortUtil.swap(data,l,r); sOVU>tb\'
return l; ( 4(,"
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} f~ wgMp.W0
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改进后的快速排序: Kf1NMin7
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package org.rut.util.algorithm.support; L3=5tuQ[5
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import org.rut.util.algorithm.SortUtil; ^B:;uyG]M
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/** _ee<i8_Va
* @author treeroot <*(^QOM
* @since 2006-2-2 jn(%v]
* @version 1.0 wJj:hA}
*/ |j~l%d*<w
public class ImprovedQuickSort implements SortUtil.Sort { YPW
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private static int MAX_STACK_SIZE=4096; cj9C6Y!
private static int THRESHOLD=10; TV=K3F5)M
/* (non-Javadoc) "hi03k
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +PS
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*/ B"8jEYT5
public void sort(int[] data) { !2h ZtX
int[] stack=new int[MAX_STACK_SIZE]; MU%7'J :_
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int top=-1; Ol~M
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int pivot; Yt?]0i+
int pivotIndex,l,r; 6$[7hlE
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stack[++top]=0; &d0sv5&s
stack[++top]=data.length-1; ~Up{zRD"B
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while(top>0){ hH HQmK<r
int j=stack[top--]; h aApw(.%
int i=stack[top--]; W.NZ%~|+e/
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pivotIndex=(i+j)/2; tv26eK
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pivot=data[pivotIndex]; $1g1Bn
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SortUtil.swap(data,pivotIndex,j); K_@?Q@#YhR
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//partition K|YB)y
l=i-1; 2?SbkU/3|P
r=j; k/D{&(F ~
do{ d$jwh(Ivs
while(data[++l] while((r!=0)&&(data[--r]>pivot)); iGkysU<wcp
SortUtil.swap(data,l,r); a|"Uw
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} [}]yJ+)
while(l SortUtil.swap(data,l,r); ^sB0$|DU
SortUtil.swap(data,l,j); a6-.|tt#t
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if((l-i)>THRESHOLD){ eIfQ
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stack[++top]=i; x-e6[_F
stack[++top]=l-1; 'It8h$^j
} kw@^4n+M
if((j-l)>THRESHOLD){ bi^?SH\
stack[++top]=l+1; r4fHD~#l{
stack[++top]=j; vj]>X4'i
} a5GLbanF
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} t2s/zxt
//new InsertSort().sort(data); q;")
insertSort(data); Be=rBrI>
} 7oWMjw\
/** f+Sb>$
* @param data 2Jio_Hk
*/ JD~;.3$/k
private void insertSort(int[] data) { +)iMJ]>
int temp; :#pdyJQ_
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ANy*'/f
} kB> ~Tb0
} p.SipQ.P
} #F.jf2h@
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