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快速排序: D6L+mTN
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package org.rut.util.algorithm.support; R;!,(l
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import org.rut.util.algorithm.SortUtil; BEOPZ[Q|c
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/** +cH>'OXoB
* @author treeroot iAz0 A
* @since 2006-2-2 fmixWL7.Zg
* @version 1.0 jfMkN
*/ qx ki
public class QuickSort implements SortUtil.Sort{ Cx2#
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/* (non-Javadoc) <iky~iE
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) /wLBmh1"
*/ x@OBGKV
public void sort(int[] data) { rQ.zqr
quickSort(data,0,data.length-1); o-=|}u]mz
} f8;?WSGyD2
private void quickSort(int[] data,int i,int j){ }<^mUG
int pivotIndex=(i+j)/2; OInl?_,,T#
//swap (p5q MP]L
SortUtil.swap(data,pivotIndex,j); b&P)J|Fe
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int k=partition(data,i-1,j,data[j]); ,'0#q
SortUtil.swap(data,k,j); v%:deaF
if((k-i)>1) quickSort(data,i,k-1); E<jajYj
if((j-k)>1) quickSort(data,k+1,j); Lng. X8D
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} !.'D"Me>
/** un 5r9
* @param data A`uHZCwJ5
* @param i [h'u@%N|/
* @param j ID_4M_G
* @return 9295:Y| w1
*/ zcP=+Y)YA
private int partition(int[] data, int l, int r,int pivot) { c]uieig0~
do{ tpGT~Y(
while(data[++l] while((r!=0)&&data[--r]>pivot); ye.6tlW
SortUtil.swap(data,l,r); o ks;G([
} I(*3n"
while(l SortUtil.swap(data,l,r); I,hw0e
return l; E4% -*n
} 5f7id7SI
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} 4H6Fq*W{k
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改进后的快速排序: A&M_ J
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package org.rut.util.algorithm.support; A1prYD
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import org.rut.util.algorithm.SortUtil; a>OYJe
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/** 1O`V_d)
* @author treeroot Po)U!5Tm
* @since 2006-2-2 ;0Z-
* @version 1.0 5[4wN(
)
*/ x[58C +
public class ImprovedQuickSort implements SortUtil.Sort { nz3*s#k\-
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private static int MAX_STACK_SIZE=4096; G Y%5N= u
private static int THRESHOLD=10; )9nW`d+
/* (non-Javadoc) I#2$CSJ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) qj;i03 +@
*/ =_`q;Tu=
public void sort(int[] data) { X\m\yv}}
int[] stack=new int[MAX_STACK_SIZE]; /F;2wT;
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int top=-1; ,Wd=!if
int pivot; @MOQk
int pivotIndex,l,r; *F1TZ_GS
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stack[++top]=0; ^UKAD'_#%O
stack[++top]=data.length-1; 684& H8
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while(top>0){ ycBgr,Ynu<
int j=stack[top--]; 3JGrJ!x
int i=stack[top--]; D\_nqx9O
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pivotIndex=(i+j)/2; BI?, 3
pivot=data[pivotIndex]; G[ U5R?/
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SortUtil.swap(data,pivotIndex,j); )8C`EPe
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//partition X|a{Z*y;r*
l=i-1; %e]G]B%
r=j; 7dY_b
do{ 6B8!}6Ojc
while(data[++l] while((r!=0)&&(data[--r]>pivot)); .T3N"}7[
SortUtil.swap(data,l,r); )vO"S
} cjN)3L{
while(l SortUtil.swap(data,l,r); ]jD\4\M}
SortUtil.swap(data,l,j); /O:4u_
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if((l-i)>THRESHOLD){ pL,XHR@Iv
stack[++top]=i; u9 &$`N_G
stack[++top]=l-1; t}k:wzZ@
} :6(\:
if((j-l)>THRESHOLD){ f,yl'2{
stack[++top]=l+1; dE"_gwtX
stack[++top]=j; #HgNwM
} w8X5kk
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} Md~SzrU
//new InsertSort().sort(data); aM
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insertSort(data); ')v,<{
} O4X03fUx
/** gbzBweWF
* @param data c?CD;Pk
*/ rx9*/Q0F
private void insertSort(int[] data) { jVnTpa!A
int temp; 8vuTF*{yZ
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); S%MDQTM
} HVus\s\&y%
} ZRf9 'UwS
} u~OlJ1V
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} ,;t:x|{%
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