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快速排序: c=p=-j=.J
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package org.rut.util.algorithm.support; eb:A1f4L
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import org.rut.util.algorithm.SortUtil; LgqGVh3\s
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/** 5>0.NiXGf'
* @author treeroot %uDG75KP{
* @since 2006-2-2 )najO*n
* @version 1.0 }<m{~32M
*/ `^F: -
public class QuickSort implements SortUtil.Sort{ !XE aF]8
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/* (non-Javadoc) /Bv#) -5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) m\0cE1fir
*/ *YV
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public void sort(int[] data) { C".1+Um
quickSort(data,0,data.length-1); W:s@L#-
} }p3b#fAr
private void quickSort(int[] data,int i,int j){ %e%7oqR?
int pivotIndex=(i+j)/2; 70gg4BS
//swap J1F{v)T'?
SortUtil.swap(data,pivotIndex,j); YcM;S
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int k=partition(data,i-1,j,data[j]); [Eq<":)
SortUtil.swap(data,k,j); QJX/7RA
if((k-i)>1) quickSort(data,i,k-1); pWaPC/,g
if((j-k)>1) quickSort(data,k+1,j); E,"&-`/2v
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} aq>?vti1D
/** mV\$q@sII
* @param data D!3{gV#
* @param i 7Ua7A
* @param j f=:.BR{
* @return <e"J4gZf&
*/ +oy*Kxs7
private int partition(int[] data, int l, int r,int pivot) { MK$Jj"
do{ Jbw!:x
[
while(data[++l] while((r!=0)&&data[--r]>pivot); T 1Cs>#)
SortUtil.swap(data,l,r); :=. *I
} ! q6hC
while(l SortUtil.swap(data,l,r); mUXk9X%n
return l; 9C}qVoNu
} )2j:z#'>
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} ^X?D#\
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改进后的快速排序: /&s}<BMHU
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package org.rut.util.algorithm.support; >{&A%b4JF
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import org.rut.util.algorithm.SortUtil; {*xBm#
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/** 2P}I'4C-
* @author treeroot _Z#eS/,O@
* @since 2006-2-2 esq<xuZM4
* @version 1.0 O%$O(l
*/ L#j/0IHD
public class ImprovedQuickSort implements SortUtil.Sort { g9V.13k
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private static int MAX_STACK_SIZE=4096; x:-`o_Q*i
private static int THRESHOLD=10; Yn<)k_kp
/* (non-Javadoc) mK\aI
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) e- 6(F4
*/ eV;me>,
public void sort(int[] data) { >>V&yJ_
int[] stack=new int[MAX_STACK_SIZE]; i^/54
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int top=-1; *{[d%B<lp
int pivot; U$J5r+>
int pivotIndex,l,r; rm|7
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stack[++top]=0; el*9 Ih
stack[++top]=data.length-1; BjZ>hhs!*
]
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while(top>0){ -Enbcz(B
int j=stack[top--]; VkXn8J
int i=stack[top--]; !;WbOnLP
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pivotIndex=(i+j)/2; !sK#zAR2
pivot=data[pivotIndex]; Xw(3j)xQ
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SortUtil.swap(data,pivotIndex,j); ;&mxqY8`'
3^ ~Zj95M
//partition 6Ct0hk4
l=i-1; ZKQo#!}
r=j; %!wq:~B1
do{ ha>SZnKD{
while(data[++l] while((r!=0)&&(data[--r]>pivot)); FO^24p
SortUtil.swap(data,l,r); LUul7y'"
} MBO,\t.
while(l SortUtil.swap(data,l,r); `,-STIh)
SortUtil.swap(data,l,j); jkCHi@
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if((l-i)>THRESHOLD){ ZbyG*5iq
stack[++top]=i; Sj1r s#@1
stack[++top]=l-1; gvr]]}h:O
} k+txb?
if((j-l)>THRESHOLD){ D(@SnI+
stack[++top]=l+1; 6vWii)O.D
stack[++top]=j; /&6Q)
} Ou!)1UFI
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} `axQd%:AC
//new InsertSort().sort(data); 40+fGRyOL
insertSort(data); `\e'K56W6
} ]:!8 s\#
/** pLo;#e8'f
* @param data ChVY
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*/ <G}m #
private void insertSort(int[] data) { (xQI($Wq*M
int temp; o{g@Nk'f
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); T7s+9CE
} ~=Fk/
} Ks51:M
} <L%HG
x' ?.~
} /rOnm=P+Q
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