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快速排序: FCOSgEU
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package org.rut.util.algorithm.support; WM9QC59
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import org.rut.util.algorithm.SortUtil; i 1
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/** U|iSJ%K
* @author treeroot ]2tX'=X
* @since 2006-2-2 /SZsXaC '
* @version 1.0 j#o0y5S
*/ qA&N6`
public class QuickSort implements SortUtil.Sort{ '%)7%O,2
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/* (non-Javadoc) c6Wy1d^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) N=-hXgX^
*/ :0V <
public void sort(int[] data) { M]eH
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quickSort(data,0,data.length-1); *p +%&z_<
} skr^m%W
private void quickSort(int[] data,int i,int j){ ba|~B8rII[
int pivotIndex=(i+j)/2; _G[5S-0 [
//swap ck-wMd
SortUtil.swap(data,pivotIndex,j); O'o`
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int k=partition(data,i-1,j,data[j]); ;clF\K>
SortUtil.swap(data,k,j); ]yA|
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if((k-i)>1) quickSort(data,i,k-1); (l9U7^S"{K
if((j-k)>1) quickSort(data,k+1,j); ]"aC
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} oE)tK1>;H
/** YI&7s_%
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* @param data fXO"Mr1
* @param i irpO(>LK
* @param j fokOjTE
* @return 6?z&G6
*/ QD q2<
private int partition(int[] data, int l, int r,int pivot) { G+=&\+{#4
do{ 8la.N*
while(data[++l] while((r!=0)&&data[--r]>pivot); uB0/H=<H
SortUtil.swap(data,l,r); y~''r%]
} Lab{?!E>U
while(l SortUtil.swap(data,l,r); ~%(r47n
return l; 61b,+'-
}
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改进后的快速排序: V_(lZDjh*
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package org.rut.util.algorithm.support; 8Q?)L4.]
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import org.rut.util.algorithm.SortUtil; (\>_{"*=
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/** 0g~WM
* @author treeroot 74xI#`E
* @since 2006-2-2 E.t9F3
* @version 1.0 { SJ=|L6
*/ AZxOq !B
public class ImprovedQuickSort implements SortUtil.Sort { {PWz:\oaD
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private static int MAX_STACK_SIZE=4096; !JJCG
private static int THRESHOLD=10; _ i.CvYe
/* (non-Javadoc) JaiYVx(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) XLI'f$w&
*/ n-}.Yc
public void sort(int[] data) { a|
int[] stack=new int[MAX_STACK_SIZE]; )
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int top=-1; V! a|rTU6
int pivot; `%"zq"1`0
int pivotIndex,l,r; C.FGi`rrm
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stack[++top]=0; _)ZAf%f?
stack[++top]=data.length-1; +);o{wfW
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while(top>0){
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int j=stack[top--]; 3@\vU~=P:
int i=stack[top--]; [AfV+$
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pivotIndex=(i+j)/2; GL9R
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pivot=data[pivotIndex]; (+q?xwl!N
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SortUtil.swap(data,pivotIndex,j); VEd\*
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//partition *.~hn5Y|?
l=i-1; )j]S;Mr
r=j; Lb{~a_c
do{ !s9<%bp3
while(data[++l] while((r!=0)&&(data[--r]>pivot)); `9kjYSd#E
SortUtil.swap(data,l,r); 7a->"W
} >/ECLP
while(l SortUtil.swap(data,l,r); 'h([Y8p{
SortUtil.swap(data,l,j); f@Hp,-
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if((l-i)>THRESHOLD){ rX{QgyY&
stack[++top]=i; tlA4oVII
stack[++top]=l-1; N|WnUlf]:
} BAx)R6kS;
if((j-l)>THRESHOLD){ Bz }Kdyur
stack[++top]=l+1; JU1U=Lu."
stack[++top]=j; jgVra*
} Xa Yx avq
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} 4;7<)&#h
//new InsertSort().sort(data); 7E%ehM6Y
insertSort(data); ec)G~?FH
} +d2+w1o^V
/** 3Yp_k
* @param data O HR9u
*/ V89!C?.[]1
private void insertSort(int[] data) { 7Q/v#_e(
int temp; ZL+{?1&-
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); Wu2#r\
} T=A7f6`
} m Wsegq4
} 1x V~EX
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} :2
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