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快速排序: .$yw;go3
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package org.rut.util.algorithm.support; \w:u&6,0O
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import org.rut.util.algorithm.SortUtil; .
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/** `~RV
* @author treeroot 7mjj%
* @since 2006-2-2 K c<z;
* @version 1.0 ArEpH"}@
*/ 1Q%.-vs
public class QuickSort implements SortUtil.Sort{ 1^;h:,e6
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/* (non-Javadoc) E,|n'
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \XN5))
*/ |x4yPYBL
public void sort(int[] data) { !$?@;}=
quickSort(data,0,data.length-1); +wSm6*j7=
} L7g&]%
private void quickSort(int[] data,int i,int j){ @Otc$hj
int pivotIndex=(i+j)/2; vraU&ze\1
//swap g#:XN
SortUtil.swap(data,pivotIndex,j); 8.^U6xA
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int k=partition(data,i-1,j,data[j]); u
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SortUtil.swap(data,k,j); _HK&KY
if((k-i)>1) quickSort(data,i,k-1); v (h Xk]S
if((j-k)>1) quickSort(data,k+1,j); &V3oW1*W
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} `Y;gMrp
/** ,OCTm%6e
* @param data >l1Yhxd_0*
* @param i t4*A+"~j
* @param j I`TD*D
* @return \i+h P1mz
*/ lnWiE}F
private int partition(int[] data, int l, int r,int pivot) { Zsogx}i-
do{ orHD3T%&
while(data[++l] while((r!=0)&&data[--r]>pivot); 5)7mjyo%
SortUtil.swap(data,l,r); gJxVU41
} ss{= ::#
while(l SortUtil.swap(data,l,r); RG3G},Q
return l; X@&uu0JJ
} zjS:;!8em
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} -ikuj
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改进后的快速排序: J_|}Xd)~t6
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package org.rut.util.algorithm.support; }.cmiC
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import org.rut.util.algorithm.SortUtil; ^(JHRH~=h
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/** *.c9$`s
* @author treeroot B9Q.s
* @since 2006-2-2 ><MgIV
* @version 1.0 #(+HSZm
*/ T;r];Y(b*
public class ImprovedQuickSort implements SortUtil.Sort { Yb3f]4EH
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private static int MAX_STACK_SIZE=4096; #Rx"L&3Ue
private static int THRESHOLD=10; Pd "mb~
/* (non-Javadoc) 7 eQoc2X2
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *.]E+MYi*
*/ kr`BUW3
public void sort(int[] data) { HL}~W}!j
int[] stack=new int[MAX_STACK_SIZE]; eQVPxt2N
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int top=-1; ,e FQ}&^A
int pivot; W}2 &Pax
int pivotIndex,l,r; B H0#Q5
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stack[++top]=0; {/A)t1nL
stack[++top]=data.length-1; VUC <0WV
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while(top>0){ JM-ce8U
int j=stack[top--]; Ym.l@(
int i=stack[top--]; /1W7<']>xV
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pivotIndex=(i+j)/2; 7vpN6YP
pivot=data[pivotIndex]; ]]=-AuV.
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SortUtil.swap(data,pivotIndex,j); i$JG^6,O
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//partition ,M@m4bx
l=i-1; Z&]+A,
r=j; {y&\?'L'
do{ mfngbFa1
while(data[++l] while((r!=0)&&(data[--r]>pivot)); Cl9SPz
SortUtil.swap(data,l,r); [7e{=\`=
} -Y8ks7
while(l SortUtil.swap(data,l,r); <p^*Ydx
SortUtil.swap(data,l,j); 0Z
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if((l-i)>THRESHOLD){ 5]H))}9>d
stack[++top]=i; Im?= e
stack[++top]=l-1; J+@MzkpK
} f3zfRhkIk
if((j-l)>THRESHOLD){ %jZp9}h
stack[++top]=l+1; hC|5e|S
stack[++top]=j; [ZKtbPHb
} yE.495
k=T-L
} *>aZc::
//new InsertSort().sort(data); nIyROhZ
insertSort(data); ;]gsJ9FK<
} jr,&=C(
/** Ha)3i{OM
* @param data FJa[ToZ4+
*/ ?qg^WDs$
private void insertSort(int[] data) { `26V`%bPkr
int temp; 9h:jFhsA9
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); #~H%[s a
} }uF[Ra
} 1V|< A
} y+4?U
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} oLrkOn/aY
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