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package org.rut.util.algorithm.support; 0&mz'xra
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import org.rut.util.algorithm.SortUtil; >5 i8%r
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/** ^T<<F}@q
* @author treeroot ?VzST }
* @since 2006-2-2 .79'c%3}
* @version 1.0 `Zk?.1*2/
*/ Af
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public class QuickSort implements SortUtil.Sort{ zCco/]h
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/* (non-Javadoc) n=yFw\w'
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) W}Z|v
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*/ XS1>ti|<
public void sort(int[] data) { goxgJOiB
quickSort(data,0,data.length-1); ey Cg *
} Q p<6qM35
private void quickSort(int[] data,int i,int j){ )fC^h=Qp
int pivotIndex=(i+j)/2; 4{J%`H`Q!
//swap qvab>U`
SortUtil.swap(data,pivotIndex,j); V=
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int k=partition(data,i-1,j,data[j]);
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SortUtil.swap(data,k,j); >Vg<J~[g
if((k-i)>1) quickSort(data,i,k-1); hx:x5L>
if((j-k)>1) quickSort(data,k+1,j); EmH2 Dbw
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} OP>'<FK
/** scA&:y
* @param data Z$+0gm\Cnw
* @param i ^(a %B
* @param j $_<,bC1[
* @return 7
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*/ ymzlRs1^Ct
private int partition(int[] data, int l, int r,int pivot) { tTP"*Bb
do{ }t]CDa_n
while(data[++l] while((r!=0)&&data[--r]>pivot); v+Ooihxl
SortUtil.swap(data,l,r); QDyL0l{C
} x==%BBnO%
while(l SortUtil.swap(data,l,r); J;G+6C$:
return l; o,u-%
} &
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改进后的快速排序: e6]u5;B
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package org.rut.util.algorithm.support; Bm.%bA>
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import org.rut.util.algorithm.SortUtil; l*/I ;a$
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/** k%JwS_F
* @author treeroot CYs:P8^
* @since 2006-2-2 nKufVe
* @version 1.0 >*dqFZF
*/ )CEfG
public class ImprovedQuickSort implements SortUtil.Sort { hesL$Z [
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private static int MAX_STACK_SIZE=4096; kW5g]Q
private static int THRESHOLD=10; LbvnV~S
/* (non-Javadoc) E_7N^htv
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) !{"{(h)+@
*/ \h?C
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public void sort(int[] data) { Pf-k"7y
int[] stack=new int[MAX_STACK_SIZE]; (wnkdI{
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int top=-1; i\2~yXw\
int pivot; .[NB"\<q
int pivotIndex,l,r; Tf<1Z{9
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stack[++top]=0; X^eTf-*T
stack[++top]=data.length-1; h /@G[5E
PW~+=,
while(top>0){ DHd9yP9-
int j=stack[top--]; "i(k 8+iK
int i=stack[top--]; -:dUD1
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pivotIndex=(i+j)/2; V*2uW2\}
pivot=data[pivotIndex]; S{7A3
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SortUtil.swap(data,pivotIndex,j); nM>oG'm[n
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//partition MOKg[j
l=i-1; |^[]Oy=
r=j; Np$pz
do{ hjtkq.@
while(data[++l] while((r!=0)&&(data[--r]>pivot)); T6*naH
SortUtil.swap(data,l,r); ]<V[H
} ?4P*,c
while(l SortUtil.swap(data,l,r); ^y]CHr
SortUtil.swap(data,l,j); d<r=f"
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if((l-i)>THRESHOLD){ 3&^4%S{/
stack[++top]=i; `lX |yy"
stack[++top]=l-1; M,7A|?O
} =*
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if((j-l)>THRESHOLD){ :
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stack[++top]=l+1; !`LaX!bmp
stack[++top]=j; lTBPq?4{
}
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} !o1{. V9q
//new InsertSort().sort(data); d!mtSOh
insertSort(data); ze@NqCF
} FAkjFgUJp
/** =ZR9zL=h
* @param data >~8;H x].d
*/ sEP-jEuwG
private void insertSort(int[] data) { ^1^k<
int temp; kclClB:PS
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); l=,\ h&
} \
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} Y&!M#7/'J3
} Cgq/#2BM
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