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快速排序: v!P b`LCqK
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package org.rut.util.algorithm.support; ^m"u3b4
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import org.rut.util.algorithm.SortUtil; *x])Y~oQ
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/** ~ !
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* @author treeroot qT"Q1xU[
* @since 2006-2-2 IOoz^/'
* @version 1.0 m&\h4$[kql
*/ }i`PGx
public class QuickSort implements SortUtil.Sort{ SWQ5fcPu
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/* (non-Javadoc) W#BM(I
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) J6%AH?Mt
*/ 079'(%
public void sort(int[] data) { xw
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quickSort(data,0,data.length-1); Eam
} &A)B~"[~
private void quickSort(int[] data,int i,int j){ '|*?*6q
int pivotIndex=(i+j)/2; 4Hn`'+b
//swap bH2MdU
SortUtil.swap(data,pivotIndex,j); @@rEs40
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int k=partition(data,i-1,j,data[j]); i|}[A
SortUtil.swap(data,k,j); *U$!I?
if((k-i)>1) quickSort(data,i,k-1); uN^=<B?B
if((j-k)>1) quickSort(data,k+1,j); .G(llA}
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} ]M[#.EX
/** A"l?:?rtw]
* @param data b0A1hb[|
* @param i *B\H-lp?
* @param j VY"9?2?/
* @return v-Fg
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*/ MXiQ1x
private int partition(int[] data, int l, int r,int pivot) { xD /9F18
do{ mVsIAC$}8
while(data[++l] while((r!=0)&&data[--r]>pivot); 6uKMCQ=h
SortUtil.swap(data,l,r); zBp{K@U[|M
} nG,U>)
while(l SortUtil.swap(data,l,r); HCJ>X;(`f?
return l; #D9e$E(J^
} A'K%WW*'U
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} st&
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改进后的快速排序: OxtOd\0$
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package org.rut.util.algorithm.support; p!V>XY'N^
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import org.rut.util.algorithm.SortUtil; )wtaKF.-
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/** gx:;&4AD
* @author treeroot \[>9UC%
* @since 2006-2-2 $1zvgep
* @version 1.0
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*/ @[?!s%*2
public class ImprovedQuickSort implements SortUtil.Sort { oM1
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private static int MAX_STACK_SIZE=4096; )Vk6;__
private static int THRESHOLD=10; iH2n.M
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/* (non-Javadoc) HygY>s+3[
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }o,z!_^PLQ
*/ ,kp\(X[J
public void sort(int[] data) { =AEz9d ciS
int[] stack=new int[MAX_STACK_SIZE]; $7Mtt.d6
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int top=-1; ZRUhAp'<qj
int pivot; a!c[!
int pivotIndex,l,r; p(m1O70C
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stack[++top]=0; ~ZlC
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stack[++top]=data.length-1; kF V7l
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while(top>0){ l??;3kh1
int j=stack[top--]; L1)@z8]
int i=stack[top--]; V5GkP1L
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pivotIndex=(i+j)/2; ;;gK@?hJ
pivot=data[pivotIndex]; dd7 =)XT+
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SortUtil.swap(data,pivotIndex,j); dj[apuiF
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//partition -#A:`/22
l=i-1; ;ggy5?>Qu
r=j; FFGqa&
do{ [H"#7t.V-~
while(data[++l] while((r!=0)&&(data[--r]>pivot)); r<L#q)]
SortUtil.swap(data,l,r); ?Zyok]s
} PG)_L.7rJ
while(l SortUtil.swap(data,l,r); D\T!4q'Q
SortUtil.swap(data,l,j); c8QnN:n
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if((l-i)>THRESHOLD){ q:HoKJv4
stack[++top]=i; "gNK><
stack[++top]=l-1; /'>;JF
} C'9 1d7E
if((j-l)>THRESHOLD){ `:-J+<`
stack[++top]=l+1;
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stack[++top]=j; Gbd?%{Xc-
} R~B0+ :6
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} K a r~I
//new InsertSort().sort(data); 1BD6l2y
insertSort(data); yCM{M
} U=o Z.\
/** o*7y ax
* @param data 135Par5v
*/ GMFc K=
private void insertSort(int[] data) { y-`I) w%
int temp; )Ul&1UYA
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 6dT|;koWbm
} 5|WOBOh>`&
} ofEqvoi@
} C/+nSe.
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} VA]ZR+m
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