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快速排序: 19i=kdH
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package org.rut.util.algorithm.support; R]l2,0:
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import org.rut.util.algorithm.SortUtil; aZmac'cz{
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/** F1/BtGvQE
* @author treeroot QwLSL<.
* @since 2006-2-2
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* @version 1.0 M
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*/ @=K*gbq5
public class QuickSort implements SortUtil.Sort{ q:mqA$n
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/* (non-Javadoc) '`&b1Rc
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \"P$*y4Le
*/ $\L=RU!c}
public void sort(int[] data) { j07b!j:"\}
quickSort(data,0,data.length-1); } a!HbH
} cHJ4[x=
private void quickSort(int[] data,int i,int j){ Y8/&1s_
int pivotIndex=(i+j)/2; u6
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//swap p+CK+m
SortUtil.swap(data,pivotIndex,j); !gi3J @
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int k=partition(data,i-1,j,data[j]); {( Ba
SortUtil.swap(data,k,j); e!w#{</8Q
if((k-i)>1) quickSort(data,i,k-1); i<!1s%i}
if((j-k)>1) quickSort(data,k+1,j); T/tC X[}
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} G4%dah 5
/** }x:}9iphF
* @param data J!H)[~2/
* @param i _xM3c&VeG
* @param j 7b(r'b@N
* @return PQ"v
*/ Wqe0m_7
private int partition(int[] data, int l, int r,int pivot) { " t,ZO
do{ ,D' bIk
while(data[++l] while((r!=0)&&data[--r]>pivot); @DlN;r?Cv
SortUtil.swap(data,l,r); rEjEz+wu
} <-HWs@8#
while(l SortUtil.swap(data,l,r); JTTI`b2l_
return l; e09QaY
} "sed{?
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} !(sL
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改进后的快速排序: .K+5k`kd
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package org.rut.util.algorithm.support; 7=HpEc
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import org.rut.util.algorithm.SortUtil; FLQ^J3A,I
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/** dZAb':
* @author treeroot W 7w*VD|
* @since 2006-2-2 _3{8Zg
* @version 1.0 r|3<UR%
*/ 33NzQb
public class ImprovedQuickSort implements SortUtil.Sort { uExYgI`<%&
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private static int MAX_STACK_SIZE=4096; =g)SZK
private static int THRESHOLD=10; jsq|K=x,
/* (non-Javadoc) lN7YU-ygz
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }sM_^&e4X
*/ >~uKkQ_p
public void sort(int[] data) { ! ~+mf^D
int[] stack=new int[MAX_STACK_SIZE]; O>IG7Ujl
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int top=-1; d V3R)
int pivot; T5aeO^x
int pivotIndex,l,r; )_K:A(V>
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stack[++top]=0; Hm_&``='
stack[++top]=data.length-1; =j8g6# 'u
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while(top>0){ p%5(Qqmlk
int j=stack[top--]; p+Fh9N<F9
int i=stack[top--]; UbP$WIrq
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pivotIndex=(i+j)/2;
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pivot=data[pivotIndex]; DK<}q1xi
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SortUtil.swap(data,pivotIndex,j); !
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//partition J:\O .F#Fi
l=i-1; aK8X,1g%)
r=j; I} \`l+
do{ cLIeo{H
while(data[++l] while((r!=0)&&(data[--r]>pivot)); _
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SortUtil.swap(data,l,r); ^NrC8,p
} F "-GhjK
while(l SortUtil.swap(data,l,r); ]gVW&3ZW
SortUtil.swap(data,l,j); i7`/"5I
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if((l-i)>THRESHOLD){ >"D0vj
stack[++top]=i; 8[IR;gZf
stack[++top]=l-1; gO bP
} 20 )8e!jP
if((j-l)>THRESHOLD){ "Wy!,RH
stack[++top]=l+1; K?=g
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stack[++top]=j; 1fV\84m^
} JgB"N/Oz
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} 3#h@,>Z;
//new InsertSort().sort(data); >x${I`2w
insertSort(data); #$JY&!M
} <KZ J
/** =@.5J'!
* @param data 2~@Cj@P]
*/ df9$k0Fx
private void insertSort(int[] data) { xUIH,Fp-9
int temp; $3(E0\#O
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); y9K'(/
} "SV/'0
} jo"zdb
} 3_Mynop
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} J_&G\b.9/
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