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快速排序: ^*`{W4e]
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package org.rut.util.algorithm.support; Z 7t 0=U
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import org.rut.util.algorithm.SortUtil; 7fLLV2
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/** >^Klq`"?g=
* @author treeroot 5znLpBX<N
* @since 2006-2-2 ({yuwH?tH
* @version 1.0 Cmm"K[>Rx
*/ LU_@8i:
public class QuickSort implements SortUtil.Sort{ ilw<Q-o4(
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/* (non-Javadoc) 8Z4d<DIJ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) [y\ZnoB
*/ X1]&j2WR
public void sort(int[] data) { W'E!5T^
quickSort(data,0,data.length-1); 8X!UtHml
} [z]@<99/
private void quickSort(int[] data,int i,int j){ p/:)Z_
int pivotIndex=(i+j)/2; 6`]R)i]
//swap v'a]SpE5
SortUtil.swap(data,pivotIndex,j); |A8Ar 7)
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int k=partition(data,i-1,j,data[j]); r42[pi]F
SortUtil.swap(data,k,j); a_^3:}i~D
if((k-i)>1) quickSort(data,i,k-1); mn{8"@Z
if((j-k)>1) quickSort(data,k+1,j); f~jx2?W
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} #^gn,^QQ
/** p>Ju)o
* @param data l,1 }1{k&
* @param i 9r
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* @param j j?jEWreq]~
* @return >MUwT$szs
*/ ::uD%a zd
private int partition(int[] data, int l, int r,int pivot) { KunK.m
do{ 'd]9u9u
while(data[++l] while((r!=0)&&data[--r]>pivot); U>(5J,G
SortUtil.swap(data,l,r); 7OS\j>hb~
} uTpKT7t
while(l SortUtil.swap(data,l,r); 79~,KFct
return l; &O#a==F!(
} yv9~
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改进后的快速排序: ^LfCLI9Z
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package org.rut.util.algorithm.support; G-G!c2o
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import org.rut.util.algorithm.SortUtil; iv?'&IUfK
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/** Y)N(uv6
* @author treeroot y rdJX
* @since 2006-2-2 ,cWO Ak
* @version 1.0 F4k<YU
*/ weT33O"!1
public class ImprovedQuickSort implements SortUtil.Sort { >f^&^28
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private static int MAX_STACK_SIZE=4096; &"._%S58V
private static int THRESHOLD=10; X;w1@4!
/* (non-Javadoc) i`gsT[JQRX
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) `-D6:- ,w
*/ ?#qA>:2,
public void sort(int[] data) { V3$!`T}g4
int[] stack=new int[MAX_STACK_SIZE]; G`R Ed-Z[
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int top=-1; $e+@9LNK
int pivot; 5w gtc~
int pivotIndex,l,r; Q# }} 1}Ja
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stack[++top]=0; %bt2^
stack[++top]=data.length-1; r4gkSwy
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while(top>0){ Vt5%A}.VQ
int j=stack[top--]; @!Il!+^3
int i=stack[top--]; teUCK(;23
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pivotIndex=(i+j)/2; H+F?)VX}oA
pivot=data[pivotIndex]; 1HN_
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SortUtil.swap(data,pivotIndex,j); }1`Rq?@J
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//partition )"&-vg<
l=i-1; ?p. dc~tZ
r=j; Q[i;IbY
do{ x&l?Cfvv=
while(data[++l] while((r!=0)&&(data[--r]>pivot)); lBR6O!sBP
SortUtil.swap(data,l,r); BXa1[7Z
} UIL5K
while(l SortUtil.swap(data,l,r); 8.o[K
SortUtil.swap(data,l,j); zf$OC}|\w
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if((l-i)>THRESHOLD){ %pc0a^iB
stack[++top]=i; ve1jLjsB
stack[++top]=l-1; 69cOdIt^D
} t}cj8DC!
if((j-l)>THRESHOLD){ BC(f1
stack[++top]=l+1; ~"gOq"y5p
stack[++top]=j; 7Hf6$2Wh
} Q&MZ/Nnf
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} lDe9EJR
//new InsertSort().sort(data); 2N5N^S
insertSort(data); D?}LKs[
} HNY{%D
/** r;y&Wa
* @param data jS5e"LMIq
*/ (+Gd)iO
private void insertSort(int[] data) { N?kXATB
int temp; c[sC 2
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); R{#-IH="
} UldK lQ8
} vW"x)~B
} n j;
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} V3yO_Iqa
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