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快速排序: NuSdN>8ll
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package org.rut.util.algorithm.support; FwlDP
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import org.rut.util.algorithm.SortUtil; Il9xNVos#
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/** \O4s0*gw
* @author treeroot {hJCn*m_
* @since 2006-2-2 <8;~4"'a
* @version 1.0 VBQAkl?(}4
*/ d,N6~?B
public class QuickSort implements SortUtil.Sort{ Sir1>YEm
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/* (non-Javadoc) xGQP*nZ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >\^oCbqF}~
*/ S6(48/
public void sort(int[] data) { }~|`h1JF
quickSort(data,0,data.length-1); Q-V8=.
} 717THci3Y
private void quickSort(int[] data,int i,int j){ S*=^I2;
int pivotIndex=(i+j)/2; OblHN*
//swap x'|9A?ez@Z
SortUtil.swap(data,pivotIndex,j); |n)4APX\Q
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int k=partition(data,i-1,j,data[j]); rP'%f 6
SortUtil.swap(data,k,j); >n3GvZ5%
if((k-i)>1) quickSort(data,i,k-1); #7Q9^rG
if((j-k)>1) quickSort(data,k+1,j); b9vudr
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} 8^+|I,
/** MymsDdQ]
* @param data [n| }>
* @param i $)"T9$>$
* @param j ~EY)c~H
* @return e-P{)L<s5
*/ gEsD7]o(=
private int partition(int[] data, int l, int r,int pivot) {
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do{ k^8;3#xG
while(data[++l] while((r!=0)&&data[--r]>pivot); 8 <;.[l
SortUtil.swap(data,l,r); { 22ey`@`h
} hG.}>(VV
while(l SortUtil.swap(data,l,r); D((/fT)eD
return l; *Vq'%b9
} (^FMm1@T
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} 53:u6bb;
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改进后的快速排序: ,"`3N2!Y}
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package org.rut.util.algorithm.support; Bf00&PE;
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import org.rut.util.algorithm.SortUtil; 5)S;R,
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/** p gLhxc:
* @author treeroot cJq{;~
* @since 2006-2-2 eWm'eO
* @version 1.0 ufR>*)_+
*/ ^0>^5l'n
public class ImprovedQuickSort implements SortUtil.Sort { ~h8k4eM
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private static int MAX_STACK_SIZE=4096; UdkNb}L
private static int THRESHOLD=10; 7mi*#X}
/* (non-Javadoc) Et*LbU
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Pfvb?Hy
*/ W3\+51P
public void sort(int[] data) { `k
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int[] stack=new int[MAX_STACK_SIZE]; teDRX13=;
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int top=-1; `{"V(YMEV
int pivot; 8cY5:plK
int pivotIndex,l,r; 7eM6 B#rI
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stack[++top]=0; E.:eO??g
stack[++top]=data.length-1; (0 t{
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while(top>0){ l@UF-n~[
int j=stack[top--]; P!9-!+F"
int i=stack[top--]; :k.>H.8+~
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pivotIndex=(i+j)/2; olo9YrHn
pivot=data[pivotIndex]; t9W* N\
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SortUtil.swap(data,pivotIndex,j); O>X!78]#K
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//partition E(S$Q^
l=i-1; 4yxf/X)
r=j; |1OF!(:
do{ dXt@x8E
while(data[++l] while((r!=0)&&(data[--r]>pivot)); t2.]v><