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快速排序: khc5h^0
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package org.rut.util.algorithm.support; B~LB^
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import org.rut.util.algorithm.SortUtil; M/Bn^A8@
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/** ^Q2K0'm5
* @author treeroot ?HZ+fS,-
* @since 2006-2-2 ;)cSdA9
* @version 1.0 ~A>3k2N/e
*/ >:KPvq!0
public class QuickSort implements SortUtil.Sort{ 4'G<qJoc
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/* (non-Javadoc) |Z#)1K
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ;y4
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*/ oA_AnD?G+
public void sort(int[] data) { |F9/7 z\5+
quickSort(data,0,data.length-1); k<8:
} w}oH]jVKL6
private void quickSort(int[] data,int i,int j){ l&;#`\s!V
int pivotIndex=(i+j)/2; z}u
//swap qhL e[[>
SortUtil.swap(data,pivotIndex,j); wyvs#T
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int k=partition(data,i-1,j,data[j]); (p^q3\
SortUtil.swap(data,k,j); e,:@c3I
if((k-i)>1) quickSort(data,i,k-1); {#Mz4s`M
if((j-k)>1) quickSort(data,k+1,j); R"=G?d)
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} 1fEV^5I
/** @i6D&e=
* @param data .CwMxuW
* @param i vV8y_
* @param j 3u+~!yz
* @return {jggiMwo.v
*/ 1=W>zC
private int partition(int[] data, int l, int r,int pivot) { c_HYB/'
do{ oAv L?2
while(data[++l] while((r!=0)&&data[--r]>pivot); F-UY~i8
SortUtil.swap(data,l,r); jDy
} .VTHZvyn
while(l SortUtil.swap(data,l,r); _2U1$0xK
return l; |/YT.c%
} =GFlaGD
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} 4`!(M]u=
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改进后的快速排序: "sL#)<%
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package org.rut.util.algorithm.support; YI&^j2
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import org.rut.util.algorithm.SortUtil; AGPZd9
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/** YuLW]Q?v
* @author treeroot %UgyGQeo
* @since 2006-2-2 LxsB.jb-
* @version 1.0 Ed_A#@V
*/ TpZ)v.w~l7
public class ImprovedQuickSort implements SortUtil.Sort { Tw-gM-m;
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private static int MAX_STACK_SIZE=4096; jJ|O]v$N
private static int THRESHOLD=10; Bam7^g'*!3
/* (non-Javadoc) hbxG
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) U*[/F)!
*/ (MwB%g
public void sort(int[] data) { OG!^:OY
int[] stack=new int[MAX_STACK_SIZE]; :;)K>g,b
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int top=-1; M2vYOg`t:c
int pivot; /,GDG=ra
int pivotIndex,l,r; sh E>gTe
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stack[++top]=0; CbI[K|
stack[++top]=data.length-1; z1(rHJd
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while(top>0){ uK3,V0 yz
int j=stack[top--]; =#n|t[h-
int i=stack[top--]; A2*z
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pivotIndex=(i+j)/2; 0alm/or
pivot=data[pivotIndex]; p>65(&N,
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SortUtil.swap(data,pivotIndex,j); 0.t;i4
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//partition Ol D]*=.cO
l=i-1; G|IO~o0+
r=j; I:bi8D6
do{ vezX/x D?
while(data[++l] while((r!=0)&&(data[--r]>pivot)); VmV/~- <Z
SortUtil.swap(data,l,r); !W .ooy5(
} m~#98ZJ^
while(l SortUtil.swap(data,l,r); F.^1|+96
SortUtil.swap(data,l,j); >$?$&+e}
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if((l-i)>THRESHOLD){ q\[f$==p
stack[++top]=i; >%'|@75K
stack[++top]=l-1; /nGsl<
} yC6XO&:g
if((j-l)>THRESHOLD){ 9q;+ Al^Z
stack[++top]=l+1; ^hRos
stack[++top]=j; lUUeM\
} |4ONGU*`E
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} 7L? ~;;L$
//new InsertSort().sort(data); {b=]JPE
insertSort(data); 2c_#q1/Z/
} zF3fpEKe
/** |jO&qT]{
* @param data :a[L-lr`e
*/ :W-"UW,
private void insertSort(int[] data) { g}P.ksM
int temp; -HS(<V=a?k
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); QcIa%lf
} K"#np!Y)
} V!a\:%#^Y
} )TBBYCL3
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} e>z3\4
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