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快速排序: <Ks?g=K-
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package org.rut.util.algorithm.support; rJ\A)O+Mq(
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import org.rut.util.algorithm.SortUtil; h,FP,w;G
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/** 6WceDY
* @author treeroot j"94hWb
* @since 2006-2-2 1G.+)*:3
* @version 1.0 Q Aygr4\X^
*/ _9!Ru!u~
public class QuickSort implements SortUtil.Sort{ k_P`t[YZV
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/* (non-Javadoc) PO&xi9_
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
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*/ )Bb :tz+
public void sort(int[] data) { VZAdc*X
quickSort(data,0,data.length-1); "MoV*U2s,
} "5{Yn!-:
private void quickSort(int[] data,int i,int j){ gvoK
int pivotIndex=(i+j)/2; <R GRvv
//swap hXz"}X n
SortUtil.swap(data,pivotIndex,j); 9?,n+
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int k=partition(data,i-1,j,data[j]); }Lb];hww1
SortUtil.swap(data,k,j); Wv=L_E_
if((k-i)>1) quickSort(data,i,k-1); ,Yi =s;E
if((j-k)>1) quickSort(data,k+1,j); I=(O,*+PQ
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} )&_{m
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/** zE<vFP-1v
* @param data -\UzL:9>
* @param i X@~sIUXx9
* @param j {E 6W]Mno
* @return &cpRB&bf
*/ sv0kksj
private int partition(int[] data, int l, int r,int pivot) { RK rBHqh@
do{ cLR8U1k'
while(data[++l] while((r!=0)&&data[--r]>pivot); Ae ue:u>
SortUtil.swap(data,l,r); (a^F`#]
} #:s'&.6
while(l SortUtil.swap(data,l,r); f{3FoN=z
return l; TUpEhQ+*
} h(G&X9*
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} 6\::Ku4_2
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改进后的快速排序: Cs]xs9
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package org.rut.util.algorithm.support; ;H:qDBH
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import org.rut.util.algorithm.SortUtil; t:M>&r:BL
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/** fcw\`.
* @author treeroot oK(ua
* @since 2006-2-2 QQ!,W':
* @version 1.0 A)`M*(~
*/ ][?GJ"O+U
public class ImprovedQuickSort implements SortUtil.Sort { k?J}-+Bm[|
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private static int MAX_STACK_SIZE=4096; .S?,%4v%%
private static int THRESHOLD=10; |?g2k:fzB7
/* (non-Javadoc) mY`b|cS3p$
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) W]M[5p]*
*/ @&EP&
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public void sort(int[] data) { $7BD~U
int[] stack=new int[MAX_STACK_SIZE]; !2{MWj
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int top=-1; xUSIck
int pivot; Q| xPm:
int pivotIndex,l,r; YDmFR,047
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stack[++top]=0; B"Fg`s+]U
stack[++top]=data.length-1; -C8awtbC
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while(top>0){ Pc4sReo'
int j=stack[top--]; l;|1C[V
int i=stack[top--]; 0j_!)B
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pivotIndex=(i+j)/2; bjvi`jyL3k
pivot=data[pivotIndex]; wkIH<w|jb
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SortUtil.swap(data,pivotIndex,j); _FVIN;!
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//partition =3(
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l=i-1; f3596a
r=j; L1D%vu`
do{ `mWg$e,
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 9]7^/g*!
SortUtil.swap(data,l,r); A$5!]+
} -7pZRnv
while(l SortUtil.swap(data,l,r); |J6CH87>
SortUtil.swap(data,l,j); T
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if((l-i)>THRESHOLD){ dvXu?F55
stack[++top]=i; #MBYa&Tw7
stack[++top]=l-1; #[i({1`^L
} xknP
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if((j-l)>THRESHOLD){ =E,*8O]
stack[++top]=l+1; _Y~+ #Vc
stack[++top]=j; .79'c%3}
} }2h~o~
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} |5FyfDaFBX
//new InsertSort().sort(data); ^(6.M\Q
insertSort(data); ml3]CcKn
} /#Xz+#SqY
/** 9wI1/>
* @param data =XWi+')
*/ +Uk/Zg
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private void insertSort(int[] data) { e{?~m6
int temp; 5q8bM.k\7N
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); BGA.8qWR4
} \?GMtM,
} 3-Ti'xM
} 7%?A0%>6G
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} RQh4RUm
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