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快速排序: ,.ivdg(/
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package org.rut.util.algorithm.support; "y"oV[`
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import org.rut.util.algorithm.SortUtil; (c)/&~aE
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/** oX:&;KA
* @author treeroot ZYWGP:Y
* @since 2006-2-2 &v((tZ
* @version 1.0 i*:QbMb
*/ rbdrs
public class QuickSort implements SortUtil.Sort{ @H#Fzoo.
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/* (non-Javadoc) oH0g>E;
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) "*<vE7
*/ "}xIt)n%;
public void sort(int[] data) { +u$JMp
quickSort(data,0,data.length-1); Pv2uZH(
} RN)XIf$@_
private void quickSort(int[] data,int i,int j){ r&a}U6k(y
int pivotIndex=(i+j)/2; Wfd`v
//swap @, fvWNI
SortUtil.swap(data,pivotIndex,j); 80lhhqRC
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int k=partition(data,i-1,j,data[j]); Yz0fOX
SortUtil.swap(data,k,j); !J;Bm,Xn6
if((k-i)>1) quickSort(data,i,k-1); ck0%H#BYY
if((j-k)>1) quickSort(data,k+1,j); D1-/#QN$1
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} J i@q7qkC
/** ?:`sE"
* @param data ps2j ]g
* @param i bR"4:b>K
* @param j G?Gf,{#K
* @return +8Q @R)3
*/ CtN\-E-
private int partition(int[] data, int l, int r,int pivot) { *cWHl@4
do{ 7Ji'7$
while(data[++l] while((r!=0)&&data[--r]>pivot); )C?H m^#
SortUtil.swap(data,l,r); ^"|q~2
} Ey:?!
while(l SortUtil.swap(data,l,r); "Y:>^F;
return l; &Wa3/mWK
} ;
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} Ix_w.f=8
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改进后的快速排序: Bq)dqLwk
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package org.rut.util.algorithm.support; In?+
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import org.rut.util.algorithm.SortUtil; wX2U
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/** Ewkx4,`Ff
* @author treeroot "AjC2P],
* @since 2006-2-2 h@O\j&#
* @version 1.0 ",aNYJR>*!
*/ `]l`t"x
public class ImprovedQuickSort implements SortUtil.Sort { B<BS^waU
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private static int MAX_STACK_SIZE=4096; Ng;?hT w
private static int THRESHOLD=10; 6X A(<1P
/* (non-Javadoc) =gSc{ i|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) C=oeRc'r1W
*/ AlDp+"|
public void sort(int[] data) { L"9Z{o7
int[] stack=new int[MAX_STACK_SIZE]; 8vq-|p
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int top=-1; 0U%tjYk(
int pivot; &8i$`6wY
int pivotIndex,l,r; `~d7l@6F
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stack[++top]=0; DRRQ]eK0
stack[++top]=data.length-1; 7{M&9| aK
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while(top>0){ Jf=V<
int j=stack[top--]; u8JH~b
int i=stack[top--]; _y6iR&&x
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pivotIndex=(i+j)/2; \41/84BA
pivot=data[pivotIndex]; .9ZK@xM&?
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SortUtil.swap(data,pivotIndex,j); ygja{W.
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//partition -`Z!p
l=i-1; 1mtYap4
r=j; +@fEw
do{ :](#W@r
while(data[++l] while((r!=0)&&(data[--r]>pivot)); h`9 & :zr
SortUtil.swap(data,l,r); :+\sKEzL
} jcJ@A0]
while(l SortUtil.swap(data,l,r); V /\Y(Mxc
SortUtil.swap(data,l,j); g?xXX
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if((l-i)>THRESHOLD){ DFZ0~+rh
stack[++top]=i; 9xJtDdy-O
stack[++top]=l-1; uHacu<$=
} J?#vL\8
if((j-l)>THRESHOLD){ 7wW x 8
stack[++top]=l+1; ^zT=qBl
stack[++top]=j; |95K
} a,4GE'
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} Yg5o!A
//new InsertSort().sort(data); o`QH8
insertSort(data); I*f@^(
} >3b<
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/** z"|jCdZGM
* @param data ~kV>nx2
*/ ;TDvk]:
private void insertSort(int[] data) { Jo[&y,
int temp; !jB}}&Ii
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); B+Qo{-
} a"Iu!$&N
} oVP,ar0G
} T[e+iv<8j
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} g2?W@/pa
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