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快速排序: [J|)DUjt
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package org.rut.util.algorithm.support; kMHupROj
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import org.rut.util.algorithm.SortUtil; ;_lEu" -
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/** t4H@ZvAH0
* @author treeroot |QvG;{!
* @since 2006-2-2 {zc<:^r^
* @version 1.0 e:Zc-
*/ 0pS|t/h0
public class QuickSort implements SortUtil.Sort{ ]r{-K63P{!
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/* (non-Javadoc) btK| U
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ;y7V-sf
*/ _Z|s!~wdz
public void sort(int[] data) { PL#8~e;'
quickSort(data,0,data.length-1); \1[I(u
} Xp=Y<`dX
private void quickSort(int[] data,int i,int j){ :A,V<Es}I"
int pivotIndex=(i+j)/2; (c<Krc
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//swap 2@
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SortUtil.swap(data,pivotIndex,j); T7AFL=
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int k=partition(data,i-1,j,data[j]); *@q+A1P7@
SortUtil.swap(data,k,j); QM1-w^
if((k-i)>1) quickSort(data,i,k-1); |yi3y `f
if((j-k)>1) quickSort(data,k+1,j); Ok+zUA[Wu
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} q9RCXo>Y+1
/** d]OoJK9&&
* @param data bc"E=z
* @param i }TZ5/zn.Dw
* @param j _,i]ra{%
* @return oVsj
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*/ FKd5]am
private int partition(int[] data, int l, int r,int pivot) { L)'JkX J
do{ u:pdY'`"#
while(data[++l] while((r!=0)&&data[--r]>pivot); " -4V48ci
SortUtil.swap(data,l,r); 66?!"w
} mAFqA
while(l SortUtil.swap(data,l,r); ,uD F#xjl,
return l; 0KyujU?sF
} A/N$
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} /(w:XTO<
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改进后的快速排序: ,P ?TYk
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package org.rut.util.algorithm.support; \`#;J?Y|`F
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import org.rut.util.algorithm.SortUtil; {}?s0U$5
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/** FDaHsiI:
* @author treeroot C+Wb_
* @since 2006-2-2 \^kyC1
* @version 1.0 ^lT$D8
*/ aW7{T6.,
public class ImprovedQuickSort implements SortUtil.Sort { (}fbs/8\p
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private static int MAX_STACK_SIZE=4096; #D3e\(
private static int THRESHOLD=10; owTW_V
/* (non-Javadoc) :b;2iBVB
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _=jc%@]1y
*/ kL^;^!Nt
public void sort(int[] data) { )#MKOsOct
int[] stack=new int[MAX_STACK_SIZE]; |2XEt\P
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int top=-1; UM7Ft"
int pivot; ics
int pivotIndex,l,r; YWeEvo(,=
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stack[++top]=0; p8BA an3
stack[++top]=data.length-1; g# :|Mjgh
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while(top>0){ ??{ (.`}R~
int j=stack[top--]; !o*BRR*
int i=stack[top--]; 6)P~3C'
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pivotIndex=(i+j)/2; 2GcQh]ohc
pivot=data[pivotIndex]; ]Ole#Lz}Q
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SortUtil.swap(data,pivotIndex,j); a=k+:=%y
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//partition a=gTGG"9
l=i-1; &Z5$
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r=j; zzuDI_,/
do{ B4R!V!Z*
while(data[++l] while((r!=0)&&(data[--r]>pivot)); <\?ySto
SortUtil.swap(data,l,r); Wt"@?#L
} aZ2liR\QE
while(l SortUtil.swap(data,l,r); JiP]FJ;
SortUtil.swap(data,l,j); X#5dd.RR
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if((l-i)>THRESHOLD){ #O^H?3Q3
stack[++top]=i; [X)+(-J
stack[++top]=l-1; A,MRK#1u
} GC H= X
if((j-l)>THRESHOLD){ .txgb
stack[++top]=l+1; j*Q/vY!T
stack[++top]=j; Gp$[u4-6M6
} nTY`1w.;
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} J$&!Y[0
//new InsertSort().sort(data); :D-d`OyjG>
insertSort(data); Ka2U@fK"
} `8\pihww
/** @fT*fv
* @param data p{!aRB%
*/ J'Yj_
private void insertSort(int[] data) { tQ'E"u1
int temp; G=!Y ~q g
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); %B3E9<9>U
} ;e()|
} 88d0`6K-9
} {8Hrb^8!
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} 1@E<5rp o
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