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快速排序: E!BPE>
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package org.rut.util.algorithm.support; Pg9hW
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import org.rut.util.algorithm.SortUtil; fkSO( C)
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/** ^D^4
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* @author treeroot ]<(]u#g_d
* @since 2006-2-2 \!IMaB]
* @version 1.0 :@W.K5
*/ G22NQ~w8
public class QuickSort implements SortUtil.Sort{ Pq*s{
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/* (non-Javadoc) Zwcy4>8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >Vy>O&r
*/ 21s4MagC
public void sort(int[] data) { dzK{
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quickSort(data,0,data.length-1); `l2O?U -@
} ?
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private void quickSort(int[] data,int i,int j){ )"f
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int pivotIndex=(i+j)/2; 4'$g(+z
//swap ?D,=37
SortUtil.swap(data,pivotIndex,j); Mb3}7 @/[
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int k=partition(data,i-1,j,data[j]); .=m,hu~
SortUtil.swap(data,k,j); x!\ONF5$
if((k-i)>1) quickSort(data,i,k-1); oH0X<'
if((j-k)>1) quickSort(data,k+1,j); 43?^7_l-
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} 08X_}97#WF
/** j!7`]
* @param data y4h=Lki@
* @param i EbeI{-'aF
* @param j y\N|<+G+
* @return XwV'Ha
*/ x^Yl*iq
private int partition(int[] data, int l, int r,int pivot) { %Qg+R26U
do{ hcVJBK
while(data[++l] while((r!=0)&&data[--r]>pivot); eh1Q7~
SortUtil.swap(data,l,r); y/e2l
} Rqwzh@}
while(l SortUtil.swap(data,l,r); ,q(&)L$S
return l; =@TQ>Qw%b
} o=FE5"t
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} #%J5\+ua
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改进后的快速排序: $$:ZX
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package org.rut.util.algorithm.support; y_xnai
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import org.rut.util.algorithm.SortUtil; 0]D0{6x8
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/** n wI!O
* @author treeroot BpX6aAx
* @since 2006-2-2 BBcV9CGU
* @version 1.0 LZMYr
*/ Z3[S]jC
public class ImprovedQuickSort implements SortUtil.Sort { ,=?{("+
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private static int MAX_STACK_SIZE=4096; ngj,x7t
private static int THRESHOLD=10; L4uFNM]
/* (non-Javadoc) OL_{_K(w
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Bgmn2-
*/ iC
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public void sort(int[] data) { 5[j`6l
int[] stack=new int[MAX_STACK_SIZE]; P0`Mdk371
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int top=-1; AoA!q>
int pivot; WyP W*
int pivotIndex,l,r; 099sN"kf
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stack[++top]=0; >
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stack[++top]=data.length-1; ]*7Y~dO
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while(top>0){ oK{ V7
int j=stack[top--]; FI"`DMb}
int i=stack[top--]; s1?[7yC
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pivotIndex=(i+j)/2; vkLC-Mzm<
pivot=data[pivotIndex]; lO2[JP
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SortUtil.swap(data,pivotIndex,j); qRbf2;
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//partition ;gC|
l=i-1; fwzb!"!.@
r=j; V.wqZ {G
do{ 64:fs?H
while(data[++l] while((r!=0)&&(data[--r]>pivot)); h*ZC*eV>
SortUtil.swap(data,l,r); #07g d#j4
} :!zl^J;
while(l SortUtil.swap(data,l,r); &@ JvnO:
SortUtil.swap(data,l,j); DWdW, xG
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if((l-i)>THRESHOLD){ !x'/9^i~v
stack[++top]=i; Z,iHy3`
stack[++top]=l-1; 9W5onn
} u4Em%:Xj
if((j-l)>THRESHOLD){ b,8{ X<
stack[++top]=l+1; qC'{;ko
stack[++top]=j; _HhbIU
} ,^icPQSwc
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} @3kKJ
//new InsertSort().sort(data); V`@>MOw^d
insertSort(data); O{ /q-~_
} <T[E=#
/** F[ewn/]n
* @param data NWxUn.Gy9
*/ OT&k.!=
private void insertSort(int[] data) { Y2'cs~~$Ce
int temp; ]~Y<o
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); y!]CJigpZ
} ExRe:^yU\
} ?k(\ApVHj
} ws^4?O
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} @?"h
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