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快速排序: vRA',(](
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package org.rut.util.algorithm.support; qQ7w&9r.M
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import org.rut.util.algorithm.SortUtil; w:o-klKXY
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/** Je4Z(kj 0
* @author treeroot ^*R(!P^
* @since 2006-2-2 rVQX7l# YI
* @version 1.0 rOD1_X-
*/ {dPgf
public class QuickSort implements SortUtil.Sort{ oK+
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/* (non-Javadoc) 'f/Lv@]a
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) lH|LdlX
*/ )[&_scSa
public void sort(int[] data) { @\(v X ]
quickSort(data,0,data.length-1); ?IX!+>.H
} Fk^3a'/4KJ
private void quickSort(int[] data,int i,int j){ lEPAP|~uw
int pivotIndex=(i+j)/2; {OT:3SS7
//swap 3Dm8[o$Z
SortUtil.swap(data,pivotIndex,j); \'19BAm'
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int k=partition(data,i-1,j,data[j]); K:yr-#(P/
SortUtil.swap(data,k,j); pz_e =xr
if((k-i)>1) quickSort(data,i,k-1); LT+3q%W.UC
if((j-k)>1) quickSort(data,k+1,j); dMl+ko
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} SC#sax4N!=
/** oJ*1>7[ J
* @param data *! :QdWLq
* @param i -%IcYzyA
* @param j OySy6IN]q
* @return _-cK{
*/ >s*Drf X6
private int partition(int[] data, int l, int r,int pivot) { <
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do{ Mo|wME#M
while(data[++l] while((r!=0)&&data[--r]>pivot); $2z
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SortUtil.swap(data,l,r); j<tq1?? [b
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while(l SortUtil.swap(data,l,r); ARh6V&Hi-
return l; w#G2-?aj
} p4X{"Z\mn
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} 1M%S
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改进后的快速排序: ]Ql 0v"` F
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package org.rut.util.algorithm.support; J/D|4fC
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import org.rut.util.algorithm.SortUtil; /k:$l9C[
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/** 00vBpsZj2;
* @author treeroot b_$1f>
* @since 2006-2-2 qFRdg V>8
* @version 1.0 96|[}:+$&:
*/ >cOeiK
public class ImprovedQuickSort implements SortUtil.Sort { 0x)dnq\
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private static int MAX_STACK_SIZE=4096; p{;i& HNdp
private static int THRESHOLD=10;
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/* (non-Javadoc) >kY p%r6
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) G`]w?Di4
*/ aSaAC7sFk
public void sort(int[] data) { u@ N~1@RT|
int[] stack=new int[MAX_STACK_SIZE]; k1N$+h
;\
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int top=-1; gb-{2p>}
int pivot; AO0!liQ
int pivotIndex,l,r; @Gjny BJ
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stack[++top]=0; A[/I#Im7
stack[++top]=data.length-1; ):6-
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while(top>0){ )3E,D~1e%
int j=stack[top--]; cwtD@KC[B
int i=stack[top--]; g@nk.aRw
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pivotIndex=(i+j)/2; W"(u^}
pivot=data[pivotIndex]; y8s=\`~PR
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SortUtil.swap(data,pivotIndex,j); d!{7r7ob\
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//partition k
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r=j; `<vxG4=62\
do{ we]>(|
while(data[++l] while((r!=0)&&(data[--r]>pivot)); o42`z>~
SortUtil.swap(data,l,r); Pern*x9$
} {sc[RRN~C
while(l SortUtil.swap(data,l,r); a1x7~)z>zi
SortUtil.swap(data,l,j); K;kM_%9u
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if((l-i)>THRESHOLD){ -}<g-*m"q
stack[++top]=i; snMQ"ju
stack[++top]=l-1; +l\<?
} T1~)^qQ
if((j-l)>THRESHOLD){ eK_*q-
stack[++top]=l+1; ;) pl{_
stack[++top]=j; ~$aTM_4
} n9}RW;N+u
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} pC^[ [5A
//new InsertSort().sort(data); Cd~LsdKE5
insertSort(data); v}`1)BUeF
} 9m!7|(QV
/** |cTpw1%I~
* @param data '
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*/ _X%Dw
private void insertSort(int[] data) { 3V-6)V{KaE
int temp; c f*zejbw
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 9) ea.Gu
} <aVfJd/fT
} k=uZ=tUft*
} sv=^k(d3
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} ;QPy:x3
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