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快速排序: zmd,uhNc:
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package org.rut.util.algorithm.support; .XDY1~w0
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import org.rut.util.algorithm.SortUtil; D#Qfa!=g
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/** Bu|Uz0Y
* @author treeroot eD5:0;X2
* @since 2006-2-2 ,p2BB"^_i
* @version 1.0 zY_xJ"/9
*/ "c5C0 pK0
public class QuickSort implements SortUtil.Sort{ ZI.;7G@|
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/* (non-Javadoc) ETU.v*HT]
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *FhD%><
*/ /]7FX"
public void sort(int[] data) { CR8a)X4j#
quickSort(data,0,data.length-1); JHQc)@E}
} '](4g/%
private void quickSort(int[] data,int i,int j){ +/
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int pivotIndex=(i+j)/2; qYpuo
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//swap M]9oSi
SortUtil.swap(data,pivotIndex,j); h1O^~"x
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int k=partition(data,i-1,j,data[j]); 5'iJN$7
SortUtil.swap(data,k,j); m BWE^
if((k-i)>1) quickSort(data,i,k-1); 70pt5O3]
if((j-k)>1) quickSort(data,k+1,j); eyq\a'tyB
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} >!u@>
/** 1K(a=o[Ce
* @param data S}fU2Wi
* @param i QY14N{]T\p
* @param j }{FKs!(4
* @return P$l-p'U-
*/ yLv jfP1
private int partition(int[] data, int l, int r,int pivot) { "mT95x\NA\
do{ "s[Y$!#
while(data[++l] while((r!=0)&&data[--r]>pivot); zx)^!dEMM
SortUtil.swap(data,l,r); [t)omPy<c
} W5'07N^
while(l SortUtil.swap(data,l,r); b _Q:v&
return l; C\.mv |aW~
} n =SY66
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} bOIVe
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改进后的快速排序: z3F ^OU
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package org.rut.util.algorithm.support; }mGOEG|F2
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import org.rut.util.algorithm.SortUtil; \Xy]z
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/** ZHPsGHA
* @author treeroot &!)F0PN:u
* @since 2006-2-2 mX@Un9k
* @version 1.0 $^&SEz
*/ Znl&.,c)
public class ImprovedQuickSort implements SortUtil.Sort { XD1x*#
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private static int MAX_STACK_SIZE=4096; 6yIl)5/=
private static int THRESHOLD=10; &5*)r@+
/* (non-Javadoc) F[aow$",+}
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) i?7%z`
*/ 8mjP2
public void sort(int[] data) { ]U :1NC"
int[] stack=new int[MAX_STACK_SIZE]; 84PD`A
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int top=-1; #
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int pivot; $Cu/!GA4.>
int pivotIndex,l,r; 6~ g:"}
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stack[++top]=0; S 6sSdo'
stack[++top]=data.length-1; )p.+39]{2
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while(top>0){ X^3 0a*sj
int j=stack[top--]; )g4oUZDF
int i=stack[top--]; V/j]UK0$
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pivotIndex=(i+j)/2; DdI7%?hK
pivot=data[pivotIndex]; gbc^Lb
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SortUtil.swap(data,pivotIndex,j); T7;)HFGeW
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//partition N0s)Nao4
l=i-1; _/[n/"gn
r=j; ~A8%[.({5
do{ fgxsC7P$
while(data[++l] while((r!=0)&&(data[--r]>pivot)); .js4)$W^
SortUtil.swap(data,l,r); lY}mrb
} 7YRDQjg
while(l SortUtil.swap(data,l,r); @4:cn
SortUtil.swap(data,l,j); $,k SR}
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if((l-i)>THRESHOLD){ 5iola}6
stack[++top]=i; #( nheL
stack[++top]=l-1; X$JO<@x
} K{VF_S:
if((j-l)>THRESHOLD){ *D1fSu!
stack[++top]=l+1; z(<
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stack[++top]=j; f{e*R#+&
} 7YbI|~
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} rL URP2~
//new InsertSort().sort(data); ;U<)$5
insertSort(data); f5a%/1?
} /x_C
/** @];#4O
* @param data MW9B
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*/ tYfhKJzGC
private void insertSort(int[] data) { k?Jzy
int temp; \3q{E",\>@
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); m@JU).NKCS
} !W:QLOe6F
} Rn{q/h
} v >3ctP{
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