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快速排序: ?HBc7$nW
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package org.rut.util.algorithm.support; hio{: (
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import org.rut.util.algorithm.SortUtil; cy? EX~s4
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/** b0
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* @author treeroot \?}ZXKuJj
* @since 2006-2-2 !e%#Zb
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* @version 1.0 k3e
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*/ w1.KRe{M
public class QuickSort implements SortUtil.Sort{ ~Ipl'cE
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/* (non-Javadoc) jd$lu^>I
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) J
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*/ v/(< fI^
public void sort(int[] data) { +p_SKk!%+
quickSort(data,0,data.length-1); WSh+5](:
} 1[^2f70n
private void quickSort(int[] data,int i,int j){ Gm_Cq2PD(
int pivotIndex=(i+j)/2; ;Cv x48
//swap (h2bxfV~+
SortUtil.swap(data,pivotIndex,j); F|Ou5WD
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int k=partition(data,i-1,j,data[j]); 0;]tC\D1
SortUtil.swap(data,k,j); qQ^]z8g6P
if((k-i)>1) quickSort(data,i,k-1); 5B"j\TwQ
if((j-k)>1) quickSort(data,k+1,j); 6o
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}
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/** tEZ@v(D
* @param data s,lrw~17
* @param i m~%IHWO'
* @param j _g
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* @return }oloMtp$
*/ \z0"
private int partition(int[] data, int l, int r,int pivot) { 29}(l#S}m
do{ +Z/Pj_.o
while(data[++l] while((r!=0)&&data[--r]>pivot); IhY[c/|i
SortUtil.swap(data,l,r); 5%uLs}{\q
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while(l SortUtil.swap(data,l,r); = gOq
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return l; ub7|'+5
} ':6`M
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改进后的快速排序: o[&*vc)
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package org.rut.util.algorithm.support; ]?-8[v~{C
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import org.rut.util.algorithm.SortUtil; <$qe2FtUq
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/** LJ\uRfs
* @author treeroot ko2 ?q
* @since 2006-2-2 1-.6psE
* @version 1.0 bXmX@A$#Io
*/ *QH@c3vUe\
public class ImprovedQuickSort implements SortUtil.Sort { O3x9S,1i
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private static int MAX_STACK_SIZE=4096; nc4KeEl
private static int THRESHOLD=10; PFq1Zai}n|
/* (non-Javadoc) o9*}>J<+RQ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) r01Z
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*/ ?d&l_Pa0e
public void sort(int[] data) { Dc-v`jZ@)
int[] stack=new int[MAX_STACK_SIZE]; "MM)AY*b
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int top=-1; .z0NMmz0z
int pivot; R2,Z`I
int pivotIndex,l,r; $ S(<7[Z
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stack[++top]=0; s3<gq x-&r
stack[++top]=data.length-1; =[5F~--Tf
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while(top>0){ EC;R^)
int j=stack[top--]; X/Sp!W-H
int i=stack[top--]; ^`iqa-1
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pivotIndex=(i+j)/2; S,0h
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pivot=data[pivotIndex]; V) xwl vX
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SortUtil.swap(data,pivotIndex,j); t9l]ie{"o.
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//partition S(2_s,J^
l=i-1; "
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r=j; uE &/:+
do{ `@3{}
while(data[++l] while((r!=0)&&(data[--r]>pivot)); W79Sz}):
SortUtil.swap(data,l,r); K]SsEsd
} Wr+/9
while(l SortUtil.swap(data,l,r); ^tFlA)
SortUtil.swap(data,l,j); z&wJ"[nOC
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if((l-i)>THRESHOLD){ S\M+*:7
stack[++top]=i; #W9{3JGUY
stack[++top]=l-1; j82x$I*
} e+~@"^|
if((j-l)>THRESHOLD){ h~pQ
stack[++top]=l+1; <s=i5t
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stack[++top]=j;
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} `T,^os#6
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} )vD:
//new InsertSort().sort(data); U!
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insertSort(data); V}h
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} 1lYQR`Uh
/** M 4E|^p=5
* @param data %bp'`B=
*/ HDi_|{2^
private void insertSort(int[] data) { 1\aV4T
int temp; bjBXs;zr@\
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); )i"52!
} \E1CQP-
} LFAefl\
} r ?<?0j
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} 1RauI0d*
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