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快速排序: JEto_&8,C
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package org.rut.util.algorithm.support; `zQuhD 8W
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import org.rut.util.algorithm.SortUtil; Q}AZkZ
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/** <[dcIw<7
* @author treeroot \g}]u(zg%
* @since 2006-2-2 U6.aoqb%
* @version 1.0 &4?&tGi
*/ z!}E2j_9P
public class QuickSort implements SortUtil.Sort{ 6
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/* (non-Javadoc) tguB@,O
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *'Yy@T8M
*/ R"t#dG]1t
public void sort(int[] data) { .QvD603%5
quickSort(data,0,data.length-1); m+c-"arIpA
} $)M3fZ$#
private void quickSort(int[] data,int i,int j){ )iN;1>
int pivotIndex=(i+j)/2; f}-'67*Y
//swap <i~xJi%1#
SortUtil.swap(data,pivotIndex,j); 9X*Nk~}Y
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int k=partition(data,i-1,j,data[j]); &=@{`2&
SortUtil.swap(data,k,j); im>(^{{r&
if((k-i)>1) quickSort(data,i,k-1); qb"S
if((j-k)>1) quickSort(data,k+1,j); @)Vpj\jM-C
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} 7H Har'=T
/** o}AXp@cqi
* @param data qDdO-fPev
* @param i F-,gj{s
* @param j khy'Y&\F;
* @return NW\CEJV
*/
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private int partition(int[] data, int l, int r,int pivot) { e;.,x 5+
do{ X$kLBG[o_
while(data[++l] while((r!=0)&&data[--r]>pivot); ~~>m
SortUtil.swap(data,l,r); j)J |'b|
} A]BeI
while(l SortUtil.swap(data,l,r); b31$i 5{
return l; xFu ,e
} {hS!IOM
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} N3G9o`k
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改进后的快速排序: LHY7_"u#
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package org.rut.util.algorithm.support; Z=Y29V8
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import org.rut.util.algorithm.SortUtil; Nc+0_|,
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/** ^|/mn!7wD
* @author treeroot %1#\LRA(
* @since 2006-2-2 Y:\msq1xp
* @version 1.0 mEY#QN[eq
*/ pBqf+}g4
public class ImprovedQuickSort implements SortUtil.Sort { )LP'4*
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private static int MAX_STACK_SIZE=4096; oG,>Pk
private static int THRESHOLD=10; O,%UNjx9K
/* (non-Javadoc) mE~WE+lw9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) MIJuJ]U}
*/ +<E#_)}`D6
public void sort(int[] data) { P'~`2W0sz
int[] stack=new int[MAX_STACK_SIZE]; >2#<gp3
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int top=-1; D.Ke
int pivot; ~n
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int pivotIndex,l,r; I0
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stack[++top]=0; uda++^y:
stack[++top]=data.length-1; Cd'D
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while(top>0){ kff N0(MR
int j=stack[top--]; #S7oW@
int i=stack[top--]; >LPb>t5%p
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pivotIndex=(i+j)/2; Pt"K+]Ym
pivot=data[pivotIndex]; +yL; ?+s>=
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SortUtil.swap(data,pivotIndex,j); ;+75"=[YT
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//partition S_7]_GQ9
l=i-1; 75\ZD-{T:
r=j; SQ)BS/8A
do{ ;lmg0dtJ
while(data[++l] while((r!=0)&&(data[--r]>pivot)); m=}h7&5 p
SortUtil.swap(data,l,r); <EC"E #p
} aImzK/
while(l SortUtil.swap(data,l,r); )"TVR{I%B
SortUtil.swap(data,l,j); rxp|[>O<
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if((l-i)>THRESHOLD){ Jt$YSp=!!
stack[++top]=i; YKe&Ph.
stack[++top]=l-1; -mJs0E*g
} QFnuu-82"
if((j-l)>THRESHOLD){ kF1$
stack[++top]=l+1; SS/vw%
stack[++top]=j; I[E 6N2
} b`e_}^,c
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} ~&~4{
//new InsertSort().sort(data); WsbVO|C
insertSort(data); u(zgKoF9A
} ]t<=a6<P
/** &A
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* @param data EC,,l'%a|/
*/ hk
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private void insertSort(int[] data) { ;Tbo \Wp9
int temp; ]]p\1G
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); *k(FbZ
} 4j3q69TZR
} 'bbw0aB4
} bg~CV&]M
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} 8R)K$J$Hm
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