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快速排序: F~tT5?+
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package org.rut.util.algorithm.support; ]Sgc42hk
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import org.rut.util.algorithm.SortUtil; j^'op|l
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/** tW|K\NL
* @author treeroot Km9Y_`?
* @since 2006-2-2 yYM_
* @version 1.0 XF 8$D
*/ YFY$iN~B,
public class QuickSort implements SortUtil.Sort{ KM;'MlO
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/* (non-Javadoc) 7Ta",S@m
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8rx"D`{|
*/ 3>t^Xu~
public void sort(int[] data) { ME%W,B.|"s
quickSort(data,0,data.length-1); jk'.Gz
} (( D*kd"
private void quickSort(int[] data,int i,int j){ T,eP&IN
int pivotIndex=(i+j)/2; x O~t
//swap A$]&j5nh|
SortUtil.swap(data,pivotIndex,j); \$]
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int k=partition(data,i-1,j,data[j]); qFD#D_O6
SortUtil.swap(data,k,j); <_~>YJ
if((k-i)>1) quickSort(data,i,k-1); o|?bvFC
if((j-k)>1) quickSort(data,k+1,j); W{!GL
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} ni$S@0
/** 6(uK5eD(!n
* @param data UfUboxT
* @param i g-Y2U}&
* @param j Zw`vPvb!
* @return ;>duY\$<
*/ 8NRc+@f|m
private int partition(int[] data, int l, int r,int pivot) { <p74U( V
do{ !K~:crUV|S
while(data[++l] while((r!=0)&&data[--r]>pivot); tuF
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SortUtil.swap(data,l,r); lSzLR~=Au
} `Z:5 E
while(l SortUtil.swap(data,l,r); <cn{S`
return l; v9qgfdBS5
} @GpM4>:
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改进后的快速排序: ]_ WB^
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package org.rut.util.algorithm.support; sm~{fg
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import org.rut.util.algorithm.SortUtil; "5,tEP!
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/** <[eE5X(
* @author treeroot oS/cS)N20
* @since 2006-2-2 v0yaFP#kG
* @version 1.0 Uz`K#Bz
*/ N BUSr}8|
public class ImprovedQuickSort implements SortUtil.Sort { _*I@ J/
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private static int MAX_STACK_SIZE=4096; m.}Yn,
private static int THRESHOLD=10; o`8dqP
/* (non-Javadoc) Rt[zZv
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) t'@qb~sf
*/ !u0qF!/W
public void sort(int[] data) { lo%:$2*'p
int[] stack=new int[MAX_STACK_SIZE]; $]Vvu{
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int top=-1; X(Wd
int pivot; _rz*7-ks=
int pivotIndex,l,r; ]}~[2k.
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stack[++top]=0; =D2jJk?AX
stack[++top]=data.length-1; .9< i
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while(top>0){ LXIQpD,M
int j=stack[top--]; cnUYhxE+s
int i=stack[top--]; %$)[qa3
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pivotIndex=(i+j)/2; YB^[HE\#y
pivot=data[pivotIndex]; #Tjv(O[&
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SortUtil.swap(data,pivotIndex,j);
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//partition `Eijy3>h
l=i-1; Tw!]N%E
r=j; /WlpRf%
do{ !8Rsz:7^-
while(data[++l] while((r!=0)&&(data[--r]>pivot)); vT#$`M<
SortUtil.swap(data,l,r); X5| <qu
} @C]Q;>^|
while(l SortUtil.swap(data,l,r); QeK@++EVc
SortUtil.swap(data,l,j); 1q])"l"<
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if((l-i)>THRESHOLD){ Yy$GfjJtL]
stack[++top]=i; Vd-\_VP20
stack[++top]=l-1; b#:Pl`n6u
} }E\ b_.
if((j-l)>THRESHOLD){ p@H3NX
stack[++top]=l+1; vakAl;
stack[++top]=j; ! f\q0Gnl
} \M
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} f
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//new InsertSort().sort(data); "pDwN$c
insertSort(data); FZW)C'j
} FY^[?lj
/** dU7+rc2,CU
* @param data (QPfrR=J4
*/ TsPx"+>7`
private void insertSort(int[] data) { y&HfF~
int temp; f__r" N
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); .#M'
} #bqc}h9
} l Ikh4T6i
} G d".zsn
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