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快速排序: bUR;d78
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package org.rut.util.algorithm.support; yXg #<H6V
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import org.rut.util.algorithm.SortUtil; mJjd2a"vi
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/** .c#G0t<i[
* @author treeroot }bwH(OOS
* @since 2006-2-2 Bismd21F6=
* @version 1.0 e;QPn(
*/ {<\ [gm\X
public class QuickSort implements SortUtil.Sort{ -)S(eqq1
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/* (non-Javadoc) )?@X{AN&
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) /5@4}m>Z@
*/ +Usy
public void sort(int[] data) { kB41{Y -
quickSort(data,0,data.length-1); H}TzNs
} Qyn~Vu43
private void quickSort(int[] data,int i,int j){ 9NX/OctFa'
int pivotIndex=(i+j)/2; ^pAgo B
//swap Q]9g
SortUtil.swap(data,pivotIndex,j); K,pQ11J
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int k=partition(data,i-1,j,data[j]); Y!M&8;>
SortUtil.swap(data,k,j); D;~c`G
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if((k-i)>1) quickSort(data,i,k-1); (]*otVJ
if((j-k)>1) quickSort(data,k+1,j); 0~.OMG:=
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} i,77F !
/** 5 iz(R:P<
* @param data f$\gm+&hXE
* @param i Oy>V/
* @param j /wF*@ /PTH
* @return 3bMQ[G
*/ =LP,+z
private int partition(int[] data, int l, int r,int pivot) { X-xN<S q
do{ Q/JX8<7K
while(data[++l] while((r!=0)&&data[--r]>pivot); #!a}ZhIt
SortUtil.swap(data,l,r); 4T]n64Yid
} VeLuL:4I
while(l SortUtil.swap(data,l,r); 6jdNQC$#B
return l; =Zg%& J
} .{pc5eUf
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} 4[\[Ho
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改进后的快速排序: {w,g~ew
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package org.rut.util.algorithm.support; WH@CH4WM
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import org.rut.util.algorithm.SortUtil; ]VarO'
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/** s]tBd!~
* @author treeroot `V(zz
* @since 2006-2-2 `pB]_"b
* @version 1.0 R~=_,JUW
*/ p2(U'x
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public class ImprovedQuickSort implements SortUtil.Sort { !!jitFHzb
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private static int MAX_STACK_SIZE=4096; SHc<`M'+
private static int THRESHOLD=10; IW Ro$Yu
/* (non-Javadoc) )QeXA)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ~Ogtgr
*/ 3hN.`G-E
public void sort(int[] data) { Xm#E9 9
int[] stack=new int[MAX_STACK_SIZE]; 7Nw}
}
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int top=-1; tC4:cX
int pivot; C`p)S`d
int pivotIndex,l,r; m1](f[$
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stack[++top]=0; k7R8Q~4
stack[++top]=data.length-1; Nb[zm|.
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while(top>0){ 'dkKBLsx
int j=stack[top--]; 4| 6<nk_
int i=stack[top--]; (wMiXi
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pivotIndex=(i+j)/2; _kgGz@/p
pivot=data[pivotIndex]; u]D>O$_ s
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SortUtil.swap(data,pivotIndex,j); ,-4SVj8$P
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//partition u$3wdZ2&m
l=i-1; mnZS](>
r=j; _tl,-}~
do{ G>3]A5
while(data[++l] while((r!=0)&&(data[--r]>pivot)); u:6PAVW?
SortUtil.swap(data,l,r); `|Ll
} } Fw/WD
while(l SortUtil.swap(data,l,r); DE0gd
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SortUtil.swap(data,l,j); xh7[{n[;
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if((l-i)>THRESHOLD){ >.tP7=
stack[++top]=i; Ps0g
stack[++top]=l-1; FN25,Q8:*I
} P
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if((j-l)>THRESHOLD){ N33{vx
stack[++top]=l+1; iva?3.t
stack[++top]=j; rO_|_nV[
} [RZ}9`V
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} |Lq -vs?
//new InsertSort().sort(data); /~4wM#Yi8
insertSort(data); m]Sv>|
} R5y+bMZ
/** v(ATbY75
* @param data GN7\p)
*/ FMuakCic5
private void insertSort(int[] data) { 4f}:)M$5
int temp; h`_@eax
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); x[ sSM:
} Z[(V0/[]
} 4\#!Gv-
} #4?(A[]>H
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} ^kS44pr\Q
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