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快速排序: T2Z$*;,>T
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package org.rut.util.algorithm.support; 1 jB0gNe
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import org.rut.util.algorithm.SortUtil; -(TC'
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/** 4dFr~ {
* @author treeroot 79>x/jZka
* @since 2006-2-2 ?aTH<
* @version 1.0 nD/B:0'
*/ 5PeYQ-B|
public class QuickSort implements SortUtil.Sort{ Sc{&h8KMTb
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/* (non-Javadoc) ":+d7xR?o
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) I= :yfW
*/ wX)'1H):T
public void sort(int[] data) { l[[`-f8j
quickSort(data,0,data.length-1); _Kaqx"D
}
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private void quickSort(int[] data,int i,int j){ kum@cA
int pivotIndex=(i+j)/2; f3!Oc
//swap %TN$
SortUtil.swap(data,pivotIndex,j); ,YM=?No
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int k=partition(data,i-1,j,data[j]); l=XZBe*[g'
SortUtil.swap(data,k,j); ?@@$)2_*u
if((k-i)>1) quickSort(data,i,k-1); }Y!V3s1bm
if((j-k)>1) quickSort(data,k+1,j); #g$I>\O<
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} i695P}J2
/** Pq+|*Y<|&
* @param data mr}o0@5av
* @param i HqV55o5f'
* @param j PH%t#a!j3/
* @return *c4OhMU(
*/ p9i7<X2&
private int partition(int[] data, int l, int r,int pivot) { no-";{c
do{ 6
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while(data[++l] while((r!=0)&&data[--r]>pivot); [7.Num_L
SortUtil.swap(data,l,r); ek5j;%~g1
} 4`l$0m@>
while(l SortUtil.swap(data,l,r); ~\-=q^/!
return l; b~fl,(sZp
} <#BK(W~$
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} ?yAb=zI1b
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改进后的快速排序: xS@jV6E~
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package org.rut.util.algorithm.support; prS%lg>
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import org.rut.util.algorithm.SortUtil; Pn4.gabE
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/** 2* `kkS
* @author treeroot P51c Ehf
* @since 2006-2-2 r|}Pg}O
* @version 1.0 7<70\6
*/ 5,XEN$^
public class ImprovedQuickSort implements SortUtil.Sort { }!fIY7gv
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private static int MAX_STACK_SIZE=4096; p\_3g!G'
private static int THRESHOLD=10; `_LQs9J0J
/* (non-Javadoc) X n0HJ^"_
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) xp:I(
*/ |+8rYIms`
public void sort(int[] data) { V8F!o
int[] stack=new int[MAX_STACK_SIZE]; Oq<3&*
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int top=-1;
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int pivot; R $<{"b
int pivotIndex,l,r; 5D/Td#T04
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stack[++top]=0; oD2! [&
stack[++top]=data.length-1; ?XVE{N
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while(top>0){ a++gwl
int j=stack[top--]; @)Vb?|3
int i=stack[top--]; nO6UlY
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pivotIndex=(i+j)/2; p?Ux1S
pivot=data[pivotIndex]; ]{i0?c
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SortUtil.swap(data,pivotIndex,j); j#c@dze
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//partition tAjT-CXg
l=i-1; ![{/V,V]~
r=j; \l0!si
do{ Fi+DG?zu
while(data[++l] while((r!=0)&&(data[--r]>pivot)); G$*=9`
SortUtil.swap(data,l,r); jm&[8ApW
} |;V-;e*
while(l SortUtil.swap(data,l,r); ,>(X}Q
SortUtil.swap(data,l,j); zuMz6#aCC8
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if((l-i)>THRESHOLD){ -[>J"l
stack[++top]=i; sDgo G
stack[++top]=l-1; .yTo)t
} y<IHZq`C3
if((j-l)>THRESHOLD){ g; R
stack[++top]=l+1; !2B~.!&
stack[++top]=j; A][ ;v
} 'Eia=@
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} K7x;/O
//new InsertSort().sort(data); wk'(g_DP
insertSort(data); Vx[Q=raS
} Z<C39s
/** jl;N
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* @param data l8Yr]oNkz
*/ V=1yg24B<
private void insertSort(int[] data) { H,;ZFg /v8
int temp; n~>b}DY
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); H^B,b!5i
} xV`)?hEXFh
} hms Aim9i
} "{S4YA
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} &j'k9C2p
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