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快速排序: 'cc8xC
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package org.rut.util.algorithm.support; hfI=9x/
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import org.rut.util.algorithm.SortUtil; 6bUP]^d
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/** PcA^ jBgGl
* @author treeroot EpG9t9S9
* @since 2006-2-2 8/j|=Q,5
* @version 1.0 ` Ny(S2
*/ ^@8XJ[C,_
public class QuickSort implements SortUtil.Sort{ `},:dDHI
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/* (non-Javadoc) ;UgwV/d
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) @k;65'"Q
*/ VD&wO'U
public void sort(int[] data) { Q e+;BE-H
quickSort(data,0,data.length-1); m%u`#67oK
} f_O|
private void quickSort(int[] data,int i,int j){ &iw,||#
int pivotIndex=(i+j)/2; HdtGyh6X0
//swap ,nL~?h-Zh
SortUtil.swap(data,pivotIndex,j); j[i*;0) |
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int k=partition(data,i-1,j,data[j]); >;Oa|G
SortUtil.swap(data,k,j); C)FO:lLr\
if((k-i)>1) quickSort(data,i,k-1); @C@9Tw2Y
if((j-k)>1) quickSort(data,k+1,j); lz>00B<Z
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} vkJyD/;=
/** N KgEs
* @param data kM4z
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* @param i e@VJ-s
* @param j X=-= z5
* @return 2~/`L=L
*/ XdDQ$'*X
private int partition(int[] data, int l, int r,int pivot) { <%3fJt-Ie
do{ CC!`fX6z>h
while(data[++l] while((r!=0)&&data[--r]>pivot); Pi=FnS
SortUtil.swap(data,l,r); aWimg6q
} 5P<1I7d
while(l SortUtil.swap(data,l,r); 0vLx={i
return l; 1J1Jp|j.
} *A!M0TK?i,
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} r6\g#}
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改进后的快速排序: @F(er
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package org.rut.util.algorithm.support; uq9mq"
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import org.rut.util.algorithm.SortUtil; !{V`N|0
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/** MHWc~@R
* @author treeroot ?MSZO]Q4+
* @since 2006-2-2 [V_mF
* @version 1.0 ha|2u(4
*/ X~m57bj
public class ImprovedQuickSort implements SortUtil.Sort { :CM-I_6
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private static int MAX_STACK_SIZE=4096; +&"W:Le:
private static int THRESHOLD=10; &u|t{C#0
/* (non-Javadoc) =.S2gO >
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %LC)sSq{H
*/ 4N=,9
public void sort(int[] data) { wT+60X'
int[] stack=new int[MAX_STACK_SIZE]; hb~d4J=S
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int top=-1; *g}==o`
int pivot; Z\C"/j<y
int pivotIndex,l,r; a9lYX*:
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stack[++top]=0; i:
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stack[++top]=data.length-1; 7ojh=imY
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while(top>0){ !-qk1+<h
int j=stack[top--]; !V #*(_+n
int i=stack[top--]; p=[dt
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pivotIndex=(i+j)/2; 6C.!+km
pivot=data[pivotIndex]; P[H`]q|
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SortUtil.swap(data,pivotIndex,j); S|u5RU8*"|
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//partition zB y%$5~Fw
l=i-1; u]B
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r=j; 0|va}m`<3G
do{ nq7)0F%e
while(data[++l] while((r!=0)&&(data[--r]>pivot)); >/.jB/q
SortUtil.swap(data,l,r); ~qb?#IY]`
} D.AiqO<z
while(l SortUtil.swap(data,l,r); wMF1HT<*
SortUtil.swap(data,l,j); 056yhB
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if((l-i)>THRESHOLD){ >Gg[J=7`
stack[++top]=i; aAoAjV NkK
stack[++top]=l-1; 1: cq\Y
} Y
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if((j-l)>THRESHOLD){ S WsD]rn
stack[++top]=l+1; 9|>y[i
stack[++top]=j; 3H"F~_H
} p(4Ek"
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} +A,cdi9z
//new InsertSort().sort(data); b2F1^]p
insertSort(data); %E,-dw
} ;ACeY
/** {Q K9pZB
* @param data k]& I(VQ"
*/ w\t
private void insertSort(int[] data) { .*FlB>1jy
int temp; 'uUa|J1mu
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); Jz;`L3m
} zSsogAx
} $3#oA.~R/
} ~U?vB((j!
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} u_WW
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