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快速排序: #y<KO`Es
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package org.rut.util.algorithm.support; yqaLqZ$
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import org.rut.util.algorithm.SortUtil; otA59 ;Z
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/** }e7os0;s
* @author treeroot o$*aAgS+
* @since 2006-2-2 q#{.8H-X'
* @version 1.0 ZA u=m
*/ RZ(*%b<C
public class QuickSort implements SortUtil.Sort{ %h}Q f&U_
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/* (non-Javadoc) WR&>AOWAD
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) F/ZB%;O9
*/ _JVFn=
public void sort(int[] data) { }?KvT$s
quickSort(data,0,data.length-1); g[oa'.*OB
} ~AVn$];{
private void quickSort(int[] data,int i,int j){ MI:
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int pivotIndex=(i+j)/2; <G9HVMiP
//swap m*Zq3j
SortUtil.swap(data,pivotIndex,j); :y/1Jf'2f
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int k=partition(data,i-1,j,data[j]); #ujry.m
SortUtil.swap(data,k,j); J`E,Xw>2
if((k-i)>1) quickSort(data,i,k-1); `D44I;e^1;
if((j-k)>1) quickSort(data,k+1,j); q*L>MV
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} >@b]t,rrK
/** 9H~2
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* @param data B]KR *
* @param i {iGy@?d)zt
* @param j aVg~/
* @return iyA=d{S;V
*/ ~XzT~WxW
private int partition(int[] data, int l, int r,int pivot) { ;PS V3Zh
do{ v qt#JdPp9
while(data[++l] while((r!=0)&&data[--r]>pivot); 'n:|D7t
SortUtil.swap(data,l,r); Vu0d\l^$
} zBQV2.@
while(l SortUtil.swap(data,l,r); wMW."gM|
return l; RP@U0o
} /C[Q?
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} *^ZJ&.
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改进后的快速排序: B(pxyv)
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package org.rut.util.algorithm.support; ,4Q1[K35B
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import org.rut.util.algorithm.SortUtil; Fy;
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/** syJLcK+e
* @author treeroot XIGz_g;#'w
* @since 2006-2-2 H*m3i;"4p\
* @version 1.0 B\73Vf
*/ -wh?9?W
public class ImprovedQuickSort implements SortUtil.Sort { h SeXxSb:
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private static int MAX_STACK_SIZE=4096; l&/V4V-
private static int THRESHOLD=10; GM~Ek]9C%
/* (non-Javadoc) z#[PTqD-_
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) |rgp(;iO
*/ 3s]aXz:
public void sort(int[] data) { <2n5|.:>
int[] stack=new int[MAX_STACK_SIZE]; ?XlPKY
%.h&W;
int top=-1; Dhe*)
int pivot; 4'+g/i1S
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int pivotIndex,l,r; u?-|sv*
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stack[++top]=0; 9\zasa
stack[++top]=data.length-1; &E]<dmR
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while(top>0){ S-f
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int j=stack[top--]; Ybk ydc
int i=stack[top--]; 6e;POW
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pivotIndex=(i+j)/2; r4isn^g
pivot=data[pivotIndex]; 'OACbYgG
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SortUtil.swap(data,pivotIndex,j); EV'i/*v}\
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//partition S4_C8
l=i-1; f7SMO-3a
r=j; e7Sp?>-d
do{ "5!T-Z+F
while(data[++l] while((r!=0)&&(data[--r]>pivot)); \{a!Z&df
SortUtil.swap(data,l,r); 6!`GUU
} n)Z u>
while(l SortUtil.swap(data,l,r); YMU2^,3
SortUtil.swap(data,l,j); %/4_|.8u
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if((l-i)>THRESHOLD){ xZ]QT3U+
stack[++top]=i; +n%d,Pz
stack[++top]=l-1; @DNwzdP
} y;if+
if((j-l)>THRESHOLD){ IAHQT<]
stack[++top]=l+1; Hl#?#A5
stack[++top]=j; T,oZaJ<
} N>H#Ew@2U
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} r j.X"
//new InsertSort().sort(data); k\TP3*fD
insertSort(data); Ygbyia|
} [[#R ry
/** B1V+CP3t
* @param data 3#0y.. F
*/ UQg_y3
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private void insertSort(int[] data) { *Fg)`M3g
int temp; 7 w<e^H?
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); i5,yrPF
} HU/2P` DGP
} '~9w<dSB!r
} `Frr?.3&-
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} x*sDp3f[*
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