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快速排序: yKhI&
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package org.rut.util.algorithm.support; N.mRay,
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import org.rut.util.algorithm.SortUtil; j-d&4,a:c
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/** Dtd~}-_Q
* @author treeroot UYxn?W.g
* @since 2006-2-2 dQT[pNp:
* @version 1.0 ]I)ofXu]
*/ Sm<*TH!\n_
public class QuickSort implements SortUtil.Sort{ (zFqb,P
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/* (non-Javadoc)
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -i?gYF!G
*/ S'5 )K
public void sort(int[] data) { ^?RH<z
quickSort(data,0,data.length-1); 1UK= t
} G_?U?:!AC
private void quickSort(int[] data,int i,int j){ 46]BRL2 G
int pivotIndex=(i+j)/2; ]y.V#,6e
//swap FD[*Q2fU
SortUtil.swap(data,pivotIndex,j); N&
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int k=partition(data,i-1,j,data[j]); A:Wr5`FJ
SortUtil.swap(data,k,j); E"9(CjbQ[
if((k-i)>1) quickSort(data,i,k-1); PS"rXaY
if((j-k)>1) quickSort(data,k+1,j); 4GP?t4][
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} WP*}X7IS
/** q{`1[R
* @param data cO7ii~&%!
* @param i >%;i@"
* @param j !#pc@(rE
* @return 2$Xof
*/ C jf<,x$
private int partition(int[] data, int l, int r,int pivot) { 7Tk//By7
do{ mDK*LL5]W
while(data[++l] while((r!=0)&&data[--r]>pivot); hYpxkco"4'
SortUtil.swap(data,l,r); |`
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} l6#Y}<tq
while(l SortUtil.swap(data,l,r); p/
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return l; +z nlf-
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改进后的快速排序:
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package org.rut.util.algorithm.support; lS9S7`
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import org.rut.util.algorithm.SortUtil; nEu:& 4
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/** s8&q8r7%
* @author treeroot N#Rb8&G)b
* @since 2006-2-2 !b_(|~7Lc
* @version 1.0 aC`>~uX##V
*/ VIdKe&,
public class ImprovedQuickSort implements SortUtil.Sort { i[9yu-
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private static int MAX_STACK_SIZE=4096; ;>mM9^Jaf
private static int THRESHOLD=10; >BO$tbU5b
/* (non-Javadoc) Y >w7%N
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) F$\Da)Y
*/ g
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public void sort(int[] data) { MrB#=3pT
int[] stack=new int[MAX_STACK_SIZE]; Hh Q0>
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int top=-1; vN^.MR+<
int pivot; >)<?
int pivotIndex,l,r; Ez~5ax7x
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stack[++top]=0; @U8u6JNK'
stack[++top]=data.length-1; \1G'{#Q
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while(top>0){ dscah0T
int j=stack[top--]; avq$aq(3&
int i=stack[top--]; (a#gCG\
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pivotIndex=(i+j)/2; U.,S.WP+d
pivot=data[pivotIndex]; D%]S>g5k
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SortUtil.swap(data,pivotIndex,j); pZ'q_Oux
" Bx@(
//partition fY9+m}$S$
l=i-1; 'wEQvCS
r=j; FShjUl>mV
do{ y#B=9Ri=z
while(data[++l] while((r!=0)&&(data[--r]>pivot)); `;Tf _6c
SortUtil.swap(data,l,r); 6=]Gom&S
} 9oJM?&i
while(l SortUtil.swap(data,l,r); I`{*QU
SortUtil.swap(data,l,j); :41Y
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if((l-i)>THRESHOLD){ xH\\#4/
stack[++top]=i; 0 YFXF
stack[++top]=l-1; 12U]=
} O8.xt|
if((j-l)>THRESHOLD){ %urvX$r4K
stack[++top]=l+1; }R<t=):
stack[++top]=j; Q&:)D7m\)S
} 5(ZOm|3ix
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} jKmjZz8L]%
//new InsertSort().sort(data); LH(P<k&
insertSort(data); ybiTWM
} Kj4BVs
/** J[:#(c&c!1
* @param data XiTi3vCe
*/ zN!W_2W*
private void insertSort(int[] data) { )&_bY~P
int temp; {.$7g8]I
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); UDr1t n
} 9JP:wE~y
} gZtQtFi
} @/kI;8
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} [<f2h-V$
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