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快速排序: ibuI/VDF
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package org.rut.util.algorithm.support; ~Op1NE
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import org.rut.util.algorithm.SortUtil; 2DC#PX)i
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/** .~U9*5d
* @author treeroot l46F3C|
* @since 2006-2-2 0/gcSW
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* @version 1.0 ;Pa(nUE@
*/ Kmnr}Lp9
public class QuickSort implements SortUtil.Sort{ K?tk&0
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/* (non-Javadoc) $KKaA{0-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) W^N"y&
*/ +i>q;=~
public void sort(int[] data) { *@&
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quickSort(data,0,data.length-1); 1wgu%$|d
} Yq^y"rw
private void quickSort(int[] data,int i,int j){ LX fiSM{o
int pivotIndex=(i+j)/2; Ww(_EW
//swap <di_2hN
SortUtil.swap(data,pivotIndex,j); ~?&ijhZ
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int k=partition(data,i-1,j,data[j]);
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SortUtil.swap(data,k,j); o/zCXZnw#
if((k-i)>1) quickSort(data,i,k-1); X2uX+}h*tA
if((j-k)>1) quickSort(data,k+1,j);
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} ;9PM?Iy[
/** vRq xZN
* @param data 0c5_L6_z
* @param i O%&@WrFq
* @param j dvD<>{U,8
* @return C#~MR+;
*/ oSl>%}
private int partition(int[] data, int l, int r,int pivot) { ZYsFd_
do{ /(V=Um^0
while(data[++l] while((r!=0)&&data[--r]>pivot); >&&xJ5
SortUtil.swap(data,l,r); U YQ$c }Z5
} =vc5,
while(l SortUtil.swap(data,l,r); '/H(,TM
return l; `"H?nf0
} Ds87#/Yfv
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} RF)B4D-W
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改进后的快速排序: * jK))|%
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package org.rut.util.algorithm.support; HUC2RM?FN
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import org.rut.util.algorithm.SortUtil; $P(nh'\
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/** vVYduvw
* @author treeroot +_eb*Z`5o
* @since 2006-2-2 pNlisS
* @version 1.0 $)3PF
*/ 5 DB>zou
public class ImprovedQuickSort implements SortUtil.Sort { WO-WoPO
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private static int MAX_STACK_SIZE=4096; ]uvbQ.l_t
private static int THRESHOLD=10; >t2b?(h/x
/* (non-Javadoc) f4S@lyYF
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) "Cc"y* P
*/ wP/9z(US
public void sort(int[] data) { C):d9OI?
int[] stack=new int[MAX_STACK_SIZE]; y^=oYL
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int top=-1; 5S]P#8
int pivot; `5-#M/J
int pivotIndex,l,r; FA9e(Ha
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stack[++top]=0; h!K2F~i{P
stack[++top]=data.length-1; ['emP1g~
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while(top>0){ Z5Ihc%J^
int j=stack[top--];
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int i=stack[top--]; p^rX.?X
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pivotIndex=(i+j)/2; :WIf$P?X
pivot=data[pivotIndex]; g
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SortUtil.swap(data,pivotIndex,j); K=x1mM+RK
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//partition oRThJ B
l=i-1; a{HgIQg_>R
r=j; 3cO[t\/up
do{ 1vs>2` DLa
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 5?L:8kHsH
SortUtil.swap(data,l,r); }8M`2HMFR
} K}`p_)(
while(l SortUtil.swap(data,l,r); b*F~%K^i$
SortUtil.swap(data,l,j); +N$7=oGC
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if((l-i)>THRESHOLD){ e'Us(]ZO
stack[++top]=i; c9TAV,/fF*
stack[++top]=l-1; WFB|lNf&
} $ t# ,'M
if((j-l)>THRESHOLD){ gpK_0?%
stack[++top]=l+1; Usf"K*A
stack[++top]=j; _K}_h\e.
} y?z _^ppj
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} <Mn7`i
//new InsertSort().sort(data); B
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insertSort(data); 5'c+313 lm
} \v3>Eo[
/** B%rr}Ro1e
* @param data 8pL>wL
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*/ ZYR,8 y
private void insertSort(int[] data) { [^d6cMEOlc
int temp; hW!@$Ph
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 7! b)'W?
} $F@L$&~
} aU.0dsq
} zNr_W[
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