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快速排序: {Jv m *
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package org.rut.util.algorithm.support; Cf-R?gn]
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import org.rut.util.algorithm.SortUtil; qOyg&]7
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/** =Q % F~
* @author treeroot *c\:ogd
* @since 2006-2-2 L*2YAIG
* @version 1.0 cx]&ae *
*/ jQAK
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public class QuickSort implements SortUtil.Sort{ __}j
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/* (non-Javadoc) >680}\S
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) S7tc
*/ VEolyPcsg&
public void sort(int[] data) { B(x$
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quickSort(data,0,data.length-1); l;4},N
} PD@]2lY(
private void quickSort(int[] data,int i,int j){ ,W"[q ~
int pivotIndex=(i+j)/2; (T1)7%Xs
//swap '\I.P
SortUtil.swap(data,pivotIndex,j); p'lL2n$E
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int k=partition(data,i-1,j,data[j]); , _K /e
SortUtil.swap(data,k,j); d"
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if((k-i)>1) quickSort(data,i,k-1); lyBae?%&
if((j-k)>1) quickSort(data,k+1,j); Y lI/~J
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} O|t@p=]
/** j@jaFsX|
* @param data S>W_p~@
* @param i Z.a`S~U
* @param j A}(&At%n4
* @return !/+'O}@-E
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private int partition(int[] data, int l, int r,int pivot) { _f9XY
do{ ZK =`Y@
while(data[++l] while((r!=0)&&data[--r]>pivot);
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SortUtil.swap(data,l,r); efj[7K.h
} aCu 8
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while(l SortUtil.swap(data,l,r); \2q!2XWgK
return l; ^Ge3"^x1
} -)biSU,
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改进后的快速排序: ;T!w$({V0z
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package org.rut.util.algorithm.support; f(Vr &X
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import org.rut.util.algorithm.SortUtil; dQD YN_
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/** w+QXSa_D
* @author treeroot *]<M%q!<6
* @since 2006-2-2 muMb pF
* @version 1.0 ZWZRG-:&H
*/ 5Jo><P a
public class ImprovedQuickSort implements SortUtil.Sort { /U
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private static int MAX_STACK_SIZE=4096; I9xQ1WJc`
private static int THRESHOLD=10; 'CE3
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/* (non-Javadoc) ~>h_#sIBC
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) {q=(x]C
*/ B@P +b*%
public void sort(int[] data) { aRPpDSR?l
int[] stack=new int[MAX_STACK_SIZE]; gi26Dtk(h
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int top=-1; n<
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int pivot; I[mlQmwsL.
int pivotIndex,l,r; }m!L2iK4qk
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