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快速排序: 2?t(%uf]
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package org.rut.util.algorithm.support; ORQGay
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import org.rut.util.algorithm.SortUtil; ;YZw{|gsh
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/** n!Y.?mU6
* @author treeroot ("/*k
* @since 2006-2-2 $O}gl Q
* @version 1.0 1\YX|
*/ Ccz:NpK+
public class QuickSort implements SortUtil.Sort{ qjR;c&
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/* (non-Javadoc) 8g>jz
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ~$r^Ur!E\
*/ W<!q>8Xn?
public void sort(int[] data) { BCUw"R#
quickSort(data,0,data.length-1); H'gPGOd
} lG#&Pv>-
private void quickSort(int[] data,int i,int j){ K'?ab 0
int pivotIndex=(i+j)/2; |Q9S$l]
//swap 6FEtq,;0w
SortUtil.swap(data,pivotIndex,j); A!^K:S:@
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int k=partition(data,i-1,j,data[j]); fS#/-wugOB
SortUtil.swap(data,k,j); b@YSrjJ
if((k-i)>1) quickSort(data,i,k-1); rA=F:N
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if((j-k)>1) quickSort(data,k+1,j); jv2l_
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} ]?``*{Zqy
/** ;k
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* @param data ls*^3^O
* @param i @TgCI`E
* @param j e}[$ =
* @return 4]
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*/ yE"hgdL
private int partition(int[] data, int l, int r,int pivot) { )W 57n)]
do{ d1y(Jt
while(data[++l] while((r!=0)&&data[--r]>pivot); -HoPECe
SortUtil.swap(data,l,r); PtgUo,P
} :Hd?0eZ|
while(l SortUtil.swap(data,l,r); CWBsiL
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return l; ,}{E+e5jh7
} =Rb, `%
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} )_j.0a
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改进后的快速排序: D<xP x
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package org.rut.util.algorithm.support; )%^ oR5W
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import org.rut.util.algorithm.SortUtil; ~-M7
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/** gEi"m5po
* @author treeroot q,:\i+>K*
* @since 2006-2-2 9,y&?GLP
* @version 1.0 ?R,^prW{
*/ fd+kr#
public class ImprovedQuickSort implements SortUtil.Sort { {ReAl_Cm
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private static int MAX_STACK_SIZE=4096; )3)L
private static int THRESHOLD=10; mnil1*-c0
/* (non-Javadoc) W;KHLHp-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) $wN'mY
*/ :eIBK
public void sort(int[] data) { "sg$[)I3n
int[] stack=new int[MAX_STACK_SIZE]; i}wu+<Mk
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int top=-1; sgCIY:8
int pivot; PI{sO |
int pivotIndex,l,r; }1_gemlf
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stack[++top]=0; >Y2Rr9
stack[++top]=data.length-1; /AMtT%91
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while(top>0){ iicrRGp3
int j=stack[top--]; 9 l,Gd
int i=stack[top--]; ~!:F'}bj
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pivotIndex=(i+j)/2; (b{
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pivot=data[pivotIndex]; {.!:T+'Xi\
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SortUtil.swap(data,pivotIndex,j); " jeJV,%
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//partition 8tdUnh%/
l=i-1; "%.#/!RG
r=j; w:umr#
do{ *:&fw'vd,
while(data[++l] while((r!=0)&&(data[--r]>pivot)); -9aht}Z
SortUtil.swap(data,l,r); 'm2,7]
} 5T
while(l SortUtil.swap(data,l,r); G %#us3x
SortUtil.swap(data,l,j); $iP#8La:Y
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if((l-i)>THRESHOLD){ DG:=E/ @
stack[++top]=i; :\bttPw5
stack[++top]=l-1; @8CD@SDv
} LZoth+:
if((j-l)>THRESHOLD){ x%(!+
stack[++top]=l+1; ikxSWO_Y=
stack[++top]=j; ho(Y?'^t3
} |Pj _L`G
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}
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//new InsertSort().sort(data); J@Orrz2q#
insertSort(data); H/L3w|2+
} Z2$-},i
/** +pFz&)?
* @param data N7;E 2 X
*/ \\/X+4|o'
private void insertSort(int[] data) { -_314j=`/
int temp; +QHhAA$
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); >K
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} '.dW>7
} #Kh`ATme
} ar^`r!ABEh
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} f
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