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快速排序: ^nVl (^{
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package org.rut.util.algorithm.support; !G_jGc=v
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import org.rut.util.algorithm.SortUtil; r.0oxH']
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/** _~aG|mAj
* @author treeroot `B8tmW#
* @since 2006-2-2 @U -$dw'4
* @version 1.0 kcB+ _
*/ PNSMcakD
public class QuickSort implements SortUtil.Sort{ W4YE~
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/* (non-Javadoc) (bn
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) FbACTeB
*/ HI&kP+,y
public void sort(int[] data) { 7.bN99{xPM
quickSort(data,0,data.length-1); AY_Q""v
} 5+X_4lEJK(
private void quickSort(int[] data,int i,int j){ em2_pq9q
int pivotIndex=(i+j)/2; ;K:8#XuV
//swap oQ+61!5>
SortUtil.swap(data,pivotIndex,j); |Y_
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int k=partition(data,i-1,j,data[j]); ?a/n<V '
SortUtil.swap(data,k,j); bdh(WJh%
if((k-i)>1) quickSort(data,i,k-1); 6ew "fCrH!
if((j-k)>1) quickSort(data,k+1,j); h[XGC=%
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} $M"0BZQ?y!
/** Qu{cB^Ga*
* @param data e&X>F"z2
* @param i =?0QqCjK)
* @param j CBD_a#K{
* @return p*;Qz
*/ dGgP_S
private int partition(int[] data, int l, int r,int pivot) { 7el<5chZ
do{ >R,?hWT
while(data[++l] while((r!=0)&&data[--r]>pivot); ]@xL=%
SortUtil.swap(data,l,r); :X .,
} ]" x\=A
while(l SortUtil.swap(data,l,r); @Hr+/52B
return l; QV,E#(\5
} DOL%'k ?B
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} jv}=&d
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改进后的快速排序: +?N}Y {Y&
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package org.rut.util.algorithm.support; + Oobb-v
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import org.rut.util.algorithm.SortUtil; Rlc$;Z9K
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/** Sr
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* @author treeroot s'2Rs^,hN
* @since 2006-2-2 :Z2tig nL
* @version 1.0 I5pp "*u
*/ *PB/iVH%6
public class ImprovedQuickSort implements SortUtil.Sort { -l.pA(O
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private static int MAX_STACK_SIZE=4096; <%,'$^'DS
private static int THRESHOLD=10; `Wf5
/* (non-Javadoc) +Hyk'=.W
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) NV!4(_~
*/ q,,j',8kq/
public void sort(int[] data) { #Go(tS~o
int[] stack=new int[MAX_STACK_SIZE]; <:cpz* G4
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int top=-1; L[]^{ O
int pivot; )<LI%dQ:'l
int pivotIndex,l,r; rsSue_Q
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stack[++top]=0; 9A*rE.B+W
stack[++top]=data.length-1; |4xo4%BQ>
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while(top>0){ %AgA -pBp
int j=stack[top--]; :1BM=_WwI
int i=stack[top--]; 0o;~~\fq.
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pivotIndex=(i+j)/2; ,Qo}J@e(
pivot=data[pivotIndex]; r9;`
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SortUtil.swap(data,pivotIndex,j); WJcVQMs
7%op zdS#
//partition a8NVLD>7}
l=i-1; )[ w&C_>]
r=j; *zSxG[s
do{ l qXc
while(data[++l] while((r!=0)&&(data[--r]>pivot)); V@Kn24''
SortUtil.swap(data,l,r); NY 4C@@"
} :s-EG;.
while(l SortUtil.swap(data,l,r); Q(blW
SortUtil.swap(data,l,j); ?+Hp?i$1
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if((l-i)>THRESHOLD){ R%W@~o\p]
stack[++top]=i; Za9$Hh/X
stack[++top]=l-1; 'oCm.~;_
} 5R"2Wd
if((j-l)>THRESHOLD){ 86#-q7aX
stack[++top]=l+1; O*ImLR)i+s
stack[++top]=j; E{I)]h
} -3\7vpcdN
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} pIvfmIm
//new InsertSort().sort(data); Y.(v{l
insertSort(data); @$EjD3Z-
} Ia'x]#~
/** ]2LXUYB
* @param data /M]eZ~QKD
*/ d4% `e&K]'
private void insertSort(int[] data) { RP(a,D|
int temp; U @)k3^
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); jp%+n
} 8H7O/n
} .<HC[ls
} T!1SMo^
)tScc*=8
} kq>GMUl~@
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