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快速排序: <+I^K 7
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package org.rut.util.algorithm.support; 03$-U0.;-
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import org.rut.util.algorithm.SortUtil; 3NAU|//J
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/** __o`+ ^FS
* @author treeroot ]wFKXZeK
* @since 2006-2-2 ?@8[1$1a
* @version 1.0 |W4
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*/ hqrI%%
public class QuickSort implements SortUtil.Sort{ S81Z\=eK
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/* (non-Javadoc) 5{/CqUIl
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) mCOJ1}
*/ uTgBnv(Y*
public void sort(int[] data) { _yk}
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quickSort(data,0,data.length-1); =2!AK[KxX
} HEdOo~/~
private void quickSort(int[] data,int i,int j){ hp=TWt~
int pivotIndex=(i+j)/2; m} /L MY
//swap B w?Kb@
SortUtil.swap(data,pivotIndex,j); x}o]R
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int k=partition(data,i-1,j,data[j]); |:yQOq|
SortUtil.swap(data,k,j); k.=67L
if((k-i)>1) quickSort(data,i,k-1); Hbwjs?Vq?]
if((j-k)>1) quickSort(data,k+1,j); q ,6 y{RyS
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} 7.g)_W{7}
/** X{KWBk.1
* @param data gSLwpIK%
* @param i 5dOA^P@`,M
* @param j hpp>+=
* @return Xb +)@Y4h
*/ *%<Ku&C
private int partition(int[] data, int l, int r,int pivot) { YF/@]6j
do{ {T|sU\| Q
while(data[++l] while((r!=0)&&data[--r]>pivot); cfI5KLG~#
SortUtil.swap(data,l,r); [GKSQt{)
} Cx$C+
while(l SortUtil.swap(data,l,r); s33< }O0
return l; ]yu,YZ@7
} .Rl58]x~
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} 5"(AqXoq
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改进后的快速排序: SjgF&LD
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package org.rut.util.algorithm.support; 4
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import org.rut.util.algorithm.SortUtil; Ij;=
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/** JmN,:bI
* @author treeroot sX53(|?*
* @since 2006-2-2 hCRW0
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* @version 1.0 Yc;cf%c1
*/ K0B
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public class ImprovedQuickSort implements SortUtil.Sort { N}{CL(xi
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private static int MAX_STACK_SIZE=4096; N,v4SIC@
private static int THRESHOLD=10; * ;A I0
/* (non-Javadoc) h.0Y!'?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 5MY+O\
*/ g*$
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public void sort(int[] data) { bm1+|gssn
int[] stack=new int[MAX_STACK_SIZE]; VU,\OOp
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int top=-1; [{3WHS.
int pivot; ,Yhy7w
int pivotIndex,l,r; tV2SX7N
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stack[++top]=0; .UNh\R?r
stack[++top]=data.length-1; `K[:<p}
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while(top>0){ FI@2KM
int j=stack[top--]; ^9T6Ix{=
int i=stack[top--]; ^Q8m)0DP
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pivotIndex=(i+j)/2; E\!:MCL
pivot=data[pivotIndex]; oH~ZqX.3
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SortUtil.swap(data,pivotIndex,j); QrDrdA
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//partition L^PZ\OC
l=i-1; q|m8G
r=j; PZ69aZ*Gs
do{ t!^FWr&
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 3}O.B
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SortUtil.swap(data,l,r); 8OC5L1
} ;aYPv8s~,:
while(l SortUtil.swap(data,l,r); rN?
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SortUtil.swap(data,l,j); bu"Jb4_a>
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if((l-i)>THRESHOLD){ =DTn9}u
stack[++top]=i; r$ue1bH}|
stack[++top]=l-1; SxXh
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} X70 vDoW
if((j-l)>THRESHOLD){ ~h -G
stack[++top]=l+1; 5n;|K]UW
stack[++top]=j; Avw"[~Xd
} 6$wS7Cu
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} n`f},.NM|
//new InsertSort().sort(data); {y0*cC
insertSort(data); :K{`0U&l5
} (\FjbY9&
/** %o<&O(Y
* @param data #FF5xe
*/ /b@0HL?
private void insertSort(int[] data) { s<0yQ-=.?N
int temp; Vja' :i
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ;}IF'ANA
} ~Av]LW
} Y>!9P\Xe
} ri~d Wx
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