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快速排序: #(3w6l2
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package org.rut.util.algorithm.support; rb%P30qc4
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import org.rut.util.algorithm.SortUtil; X>OO4SV
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/** x<60=f[O2R
* @author treeroot e:{v.C0ez
* @since 2006-2-2 .$)'7
* @version 1.0 #C,M8~Q7
*/ =]E(iR_&
public class QuickSort implements SortUtil.Sort{ I=l() ET=
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/* (non-Javadoc) {55{YDqx
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) )c5M;/s
*/ 6XUcJ0
public void sort(int[] data) { RL |.y~
quickSort(data,0,data.length-1); 9Q-/Yh
} 3 D,PbAd
private void quickSort(int[] data,int i,int j){ J]i=SX+ 9
int pivotIndex=(i+j)/2; cv;&ff2%?
//swap 4]nU%`Z1w
SortUtil.swap(data,pivotIndex,j); <.(IJ
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int k=partition(data,i-1,j,data[j]); OQaM4 7"
SortUtil.swap(data,k,j); c#nFm&}dm
if((k-i)>1) quickSort(data,i,k-1); kCxmC<34
if((j-k)>1) quickSort(data,k+1,j); 'p-jMD}O
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} s `xp6\$
/** E-_)w
* @param data VaQ>g*(I
* @param i ;%2/
* @param j m8$6FN
* @return 7CYu"+Ea
*/ &0SGAJlec
private int partition(int[] data, int l, int r,int pivot) { UTKS<.q
do{ ,e( |,u
while(data[++l] while((r!=0)&&data[--r]>pivot); S6,AY(V
SortUtil.swap(data,l,r); ;YNN)P%"
} \c>9f"jS_
while(l SortUtil.swap(data,l,r); eS fT+UL
return l; C$oY,A,
} l_iucN
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} YQ X+lE
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改进后的快速排序: [&t3xC,
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package org.rut.util.algorithm.support; CCfuz &
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import org.rut.util.algorithm.SortUtil; 2\l7=9 ]\3
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/** KCJ zE>
* @author treeroot 1qbd6D|t
* @since 2006-2-2 (7`goi7M
* @version 1.0 GjE/!6b
*/ |M#b`g$JO,
public class ImprovedQuickSort implements SortUtil.Sort { K`* 8*k{
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private static int MAX_STACK_SIZE=4096; Tk$rwTCl
private static int THRESHOLD=10; !I]fNTv<
/* (non-Javadoc) W=}l=o!G.
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) p.TR1BHw
*/ [Ua4{3#
public void sort(int[] data) {
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int[] stack=new int[MAX_STACK_SIZE]; -liVYI2s
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int top=-1; 1QtT*{zm$F
int pivot; SPOg'
int pivotIndex,l,r; ~!meO;|W
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stack[++top]=0; &tw.]3
stack[++top]=data.length-1; r!V#@Md
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while(top>0){ uzG<(Q pu
int j=stack[top--]; 1c~c_Cc4
int i=stack[top--]; \2-!%i,
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pivotIndex=(i+j)/2; a1M-F3
pivot=data[pivotIndex]; yk!,{Q?<$
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SortUtil.swap(data,pivotIndex,j); ps"crV-W
cKh { s
//partition
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l=i-1; flIdL,
r=j; iHr{
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do{ QXishHk&
while(data[++l] while((r!=0)&&(data[--r]>pivot)); v3Tr6[9
SortUtil.swap(data,l,r); rmUTl
} Hq$AF
while(l SortUtil.swap(data,l,r); ;4 R1
SortUtil.swap(data,l,j); X3(:)zUL
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if((l-i)>THRESHOLD){ DF%\1C>
stack[++top]=i; * gr{{c
stack[++top]=l-1; Z/sB72K1
} P[ n`X
if((j-l)>THRESHOLD){ 3m#v|52oj
stack[++top]=l+1; Z66akr
stack[++top]=j; r1EccY
} Ge@./SGT
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} D#x D-c
//new InsertSort().sort(data); -Vn9YeH+
insertSort(data); c?CwxI_b8
} gZ
/** x%B^hH;W
* @param data ~Lhq7;=H?O
*/ ~l}rYi>g%
private void insertSort(int[] data) { yY4*/w7*j4
int temp; lDe9(5|)Q
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); tq}sXt
} dc5w_98o
} 5,I'6$J
} 'Z+w\0}@
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} IKKd
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