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快速排序: L:-lqag!
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package org.rut.util.algorithm.support; ?C35
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import org.rut.util.algorithm.SortUtil; 5eA]7$ic
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/** Sj?sw]3
* @author treeroot "'Uk0>d=_I
* @since 2006-2-2 HU9y{H
* @version 1.0 4a!7|}W
*/ %<yM=1~>
public class QuickSort implements SortUtil.Sort{ u2-7vudh
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/* (non-Javadoc)
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) oE1]vX
*/ @~3c"q;i7
public void sort(int[] data) { ton`ji\^
quickSort(data,0,data.length-1); <t% A)L%
} u V7Hsg9l
private void quickSort(int[] data,int i,int j){ 0z7mre^Q
int pivotIndex=(i+j)/2; C}_:K)5q
//swap RI3{>|*
SortUtil.swap(data,pivotIndex,j); W+e*(W|d6
#%b()I_([
int k=partition(data,i-1,j,data[j]); }c ;um
SortUtil.swap(data,k,j);
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if((k-i)>1) quickSort(data,i,k-1); 5C1Rub)
if((j-k)>1) quickSort(data,k+1,j); c0q)
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} } <4[(N
/** L^1q/4${
* @param data <Cu?$
* @param i ?^ezEpW
* @param j G D{fXhgk
* @return D*'M^k|1
*/ O) %kl
private int partition(int[] data, int l, int r,int pivot) { KGmc*Jwy
do{ r5fkt>HZ
while(data[++l] while((r!=0)&&data[--r]>pivot); Ja=70ZI^6
SortUtil.swap(data,l,r); jI`To%^Y
} 0nq}SH
while(l SortUtil.swap(data,l,r); V,"iMo
return l; uf'P9MA}>
} K6*UFO4}i
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} RG
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改进后的快速排序: 7h9[-d6
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package org.rut.util.algorithm.support; a05:iFoJ
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import org.rut.util.algorithm.SortUtil; |;u%JW$4
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/** PT@e),{~o9
* @author treeroot f@Rpb}zg+C
* @since 2006-2-2 %>9+1lUhV
* @version 1.0 C:GHP$/}
*/ PBww
public class ImprovedQuickSort implements SortUtil.Sort { @23RjoK
j)tCr Py
private static int MAX_STACK_SIZE=4096; Prb_/B Dd
private static int THRESHOLD=10; fZV8o$V
/* (non-Javadoc) CpRu*w{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) a}qse5Fr
*/ |Iok(0V
public void sort(int[] data) { g3~~"`2
int[] stack=new int[MAX_STACK_SIZE]; 0I>?_?~l6
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int top=-1; nl-t<#z[
int pivot; s 9|a2/{
int pivotIndex,l,r; 3aE[F f[
&!DZW5
stack[++top]=0; 4&oXy,8LC
stack[++top]=data.length-1; 0qL
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h%1~v$W`
while(top>0){ p17|ld`
int j=stack[top--]; y@kcXlY
int i=stack[top--]; [Zt#
c C+
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pivotIndex=(i+j)/2; ZO%fS'n
pivot=data[pivotIndex]; 3Zaq#uA
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SortUtil.swap(data,pivotIndex,j); xOVA1pb,
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//partition ;h,R?mU
l=i-1; oP=T6PX~l
r=j; cVB|sYdf
do{ A{4G@k+#d
while(data[++l] while((r!=0)&&(data[--r]>pivot)); >w2Q1!
SortUtil.swap(data,l,r); 9Q C"Od9H
} D%;wVnUw
while(l SortUtil.swap(data,l,r); (0OSGG9
SortUtil.swap(data,l,j); 1!>bhH}{D
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if((l-i)>THRESHOLD){ cyGN3t9`.
stack[++top]=i; 5Cc6,
]
stack[++top]=l-1; P1 7> 6)a
} ~+pg^en
if((j-l)>THRESHOLD){ %z-dM` i
stack[++top]=l+1; -SQJH}zCT+
stack[++top]=j; ~A[YnJYA#
} wGOMUWAt
Jw:Fj{D
} X"hOHx5P
//new InsertSort().sort(data); 9Eq^B9(
insertSort(data); CF3E]dt
} ilDJwZg#
/** ;f".'9 l^
* @param data wUZQB1$F
*/ TnN^2:cU
private void insertSort(int[] data) { lnC!g
int temp; ee&nU(pK
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ]PR|d\O
} 457fT |
}
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} WdTbt
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} /{fZH,!L
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