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快速排序: am7~
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package org.rut.util.algorithm.support; m9-=Y{&/
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import org.rut.util.algorithm.SortUtil; {K:]dO
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/** K `A8N
* @author treeroot X/m~^
* @since 2006-2-2 ^f,%dM=i=
* @version 1.0 Blj<|\igc
*/ 1xO-tIp/
public class QuickSort implements SortUtil.Sort{ YlR9
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/* (non-Javadoc) 4[Wwm
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,pVe@ d'
*/ $H&:R&Us
public void sort(int[] data) { A!}Ps"Z
quickSort(data,0,data.length-1); i|28:FJA
} 9kbczL^Y
private void quickSort(int[] data,int i,int j){ 6fCHd10!
int pivotIndex=(i+j)/2; M 5`hMfg
//swap
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SortUtil.swap(data,pivotIndex,j); 3~Ap1_9
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int k=partition(data,i-1,j,data[j]); 0\!v{A>
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SortUtil.swap(data,k,j); )HX(-"c
if((k-i)>1) quickSort(data,i,k-1); LyL(~Jc|
if((j-k)>1) quickSort(data,k+1,j); ktp<o.f[
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} g0-rQA
/** b"B:DDw00
* @param data SzfMQ@~
* @param i BKgCuz:y
* @param j D6C h6i5$
* @return 3UUN@Tx
*/ >gz8,&
private int partition(int[] data, int l, int r,int pivot) { [X>f;;h
do{ uH[:R vC0
while(data[++l] while((r!=0)&&data[--r]>pivot); xLgZtLt9
SortUtil.swap(data,l,r); \5Y<UJKi
} $\M];S=CY
while(l SortUtil.swap(data,l,r); }02(Y!Gh
return l; P?zaut
} ?I\,RiZkz^
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} _>8Q{N\-
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改进后的快速排序: Zq5~M bldh
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package org.rut.util.algorithm.support; T8yMaC
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import org.rut.util.algorithm.SortUtil; fVdu9 l
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/** yM,Y8^
* @author treeroot D_`NCnYG
* @since 2006-2-2 su3Wk,MLP
* @version 1.0 xJA{Hws
*/ oArJ%Y>
public class ImprovedQuickSort implements SortUtil.Sort { Lu5X~6j"$
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private static int MAX_STACK_SIZE=4096; % iZM9Q&NC
private static int THRESHOLD=10; l kyK
/* (non-Javadoc) 2IUd?i3~l
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ;mPX8bT
*/ nlaW$b{=
public void sort(int[] data) { P]armg%
int[] stack=new int[MAX_STACK_SIZE]; b[:{\!I
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int top=-1; &:1q3gDm
int pivot; usC$NVdm
int pivotIndex,l,r; 7:<A_OLi
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stack[++top]=0; \1QY=}
stack[++top]=data.length-1; *kEzGgTzoS
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while(top>0){ %joL}f[
int j=stack[top--]; <Y$(
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int i=stack[top--]; )V&hS5P=S
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pivotIndex=(i+j)/2; \k^ojz J
pivot=data[pivotIndex]; 8 VhU)fY
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SortUtil.swap(data,pivotIndex,j); l,zhBnD
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//partition <1
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l=i-1; *N"CV={No
r=j; n=|% H'U
do{ C7DwA/$D
while(data[++l] while((r!=0)&&(data[--r]>pivot)); <XN=v!2;
SortUtil.swap(data,l,r); NCl@C$W9q
} n7yp6Db
while(l SortUtil.swap(data,l,r); -:OJX #j
SortUtil.swap(data,l,j); FZLx.3k4
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if((l-i)>THRESHOLD){ M>}_2G]#F
stack[++top]=i; Qkhor-f0
stack[++top]=l-1; $48Z>ij?f
} D3%2O`9
if((j-l)>THRESHOLD){ oYt 34@{?
stack[++top]=l+1; C\B4Uu6q
stack[++top]=j; j-.Y!$a%6
} `csZ*$7
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} VqxK5
//new InsertSort().sort(data); K<kl2#
insertSort(data); G=SMz+z
} 76KNgV)3
/** *[|+5LVn
* @param data 9C0#K\
*/ 1:>F{g
private void insertSort(int[] data) { +C[g>c}d
int temp; w~ON861
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); SD<a#S\o
} ?~!9\dek,
} 1X&jlD?
} e =r
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} L(sT/
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