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快速排序: {sl~2#,}b1
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package org.rut.util.algorithm.support; r:.6"VQu}
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import org.rut.util.algorithm.SortUtil; 4 *H(sq
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/** .@Hmg
* @author treeroot l$=Gvb
* @since 2006-2-2 !2#\| NJk
* @version 1.0 K_Z+]]$#
*/ R/Tj^lM
public class QuickSort implements SortUtil.Sort{ G I&qwA
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/* (non-Javadoc) /G{&[X<4U
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +{S Maq
*/ sC!1B6:
public void sort(int[] data) {
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quickSort(data,0,data.length-1); mn(/E/
} PIgGXNo
private void quickSort(int[] data,int i,int j){ =A$Lgk>|
int pivotIndex=(i+j)/2; 5Ws5X_?d
//swap o@Scz!"g
SortUtil.swap(data,pivotIndex,j); SgyqmYTvZw
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int k=partition(data,i-1,j,data[j]); !NILpimi
SortUtil.swap(data,k,j); }Q,(u
if((k-i)>1) quickSort(data,i,k-1); p
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if((j-k)>1) quickSort(data,k+1,j); <zfO1~^
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} RA#\x.
/** u):X>??
* @param data )lQN)!.)
* @param i .L~f Fns/
* @param j bta0?O
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* @return MP6 \r
*/ "1_{c *ck
private int partition(int[] data, int l, int r,int pivot) { T_3V/)%@
do{ >|v=Ba6R0
while(data[++l] while((r!=0)&&data[--r]>pivot); N5[_a/
SortUtil.swap(data,l,r); I[tAT[ <
} |3s.;wK
while(l SortUtil.swap(data,l,r); ac2}3$u
return l; e_YW~z=6t
} 0*37D5jH
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} _Jf J%YXy
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改进后的快速排序: +J\L4ri k
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package org.rut.util.algorithm.support; V`WI"HO+
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import org.rut.util.algorithm.SortUtil; @C!JtgO%
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/** wJ;9),fL
* @author treeroot ^G]KE8
* @since 2006-2-2 E#yCcC!wMY
* @version 1.0 S/#) :,YS
*/ 3MS3O.0]/
public class ImprovedQuickSort implements SortUtil.Sort { + TPbIRA
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private static int MAX_STACK_SIZE=4096; |NphG|
private static int THRESHOLD=10; e["Z!D_H
/* (non-Javadoc) 34&u]4=L)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Mqrt-VPh
*/ 5#9`ROT9
public void sort(int[] data) { e
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int[] stack=new int[MAX_STACK_SIZE]; )W_ Y3M,
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int top=-1; {[(W4NAlH
int pivot; @LwVmR |{
int pivotIndex,l,r; OF<[Nh\.
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stack[++top]=0; LbtlcpF*~5
stack[++top]=data.length-1; $G^H7|PzdC
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while(top>0){ A;/Xt
int j=stack[top--]; !VJT"Ds_
int i=stack[top--]; bUipp\[aV
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pivotIndex=(i+j)/2; jS5t?0
pivot=data[pivotIndex]; $w2[5|^S
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SortUtil.swap(data,pivotIndex,j); N@%xLJF=N>
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//partition h:US]ZC^Z
l=i-1; .q|xMS}4
r=j; 5jj57j"
do{ j3V"d 3)
while(data[++l] while((r!=0)&&(data[--r]>pivot)); MOH,'@&6^
SortUtil.swap(data,l,r); K7d1(.
} /ab K/8ZQ
while(l SortUtil.swap(data,l,r); *I;Mp
SortUtil.swap(data,l,j); k^vmRe<lk
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if((l-i)>THRESHOLD){ U`vt/#j
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stack[++top]=i; <T=o]M$
stack[++top]=l-1; }!J/ 9WKgU
} })yb
if((j-l)>THRESHOLD){ swe8
stack[++top]=l+1; z;@S_0M,Z
stack[++top]=j; U%SNROj
} .jG.90
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} :L+zUlsf
//new InsertSort().sort(data); ?),K=E+=U
insertSort(data); EzY
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} B+e~k?O] 1
/** K`AW?p^$Y
* @param data E'6z7m.
*/ EWvid4QEi
private void insertSort(int[] data) { ^LAS9K1.
int temp; 4 9+}OIX
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 70 DQ/b
} vA $BBXX
} kQ:>j.^e
} e1Z;\U$&.
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} 7[ VCCI
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