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快速排序: K0>;4E>B
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package org.rut.util.algorithm.support; 0L;,\&*u
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import org.rut.util.algorithm.SortUtil; tk0m[HN@eV
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/** IFW(nB(
* @author treeroot r@JMf)a]
* @since 2006-2-2 L1_O!EQ
* @version 1.0 aj|3(2;Kp
*/ ,b^Y8_ltoT
public class QuickSort implements SortUtil.Sort{ 5]mH.{$x$?
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/* (non-Javadoc) Qfp4}a=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^5Y<evjm
*/ wmpQF<
public void sort(int[] data) { qKSR5 #
quickSort(data,0,data.length-1); iK2f]h
} #@nPB.
private void quickSort(int[] data,int i,int j){ !" FEp
int pivotIndex=(i+j)/2; dkC_Sh{
//swap #0)TS
SortUtil.swap(data,pivotIndex,j); [`|t( E'
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int k=partition(data,i-1,j,data[j]); H M(X8iNt
SortUtil.swap(data,k,j); hxdjmc-
if((k-i)>1) quickSort(data,i,k-1); Ri"rT] '
if((j-k)>1) quickSort(data,k+1,j); ^WU[+H ;
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} 5X8 i=M;
/** ?taC
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* @param data 'h ?
* @param i /@Jg [na
* @param j ql%K+4@
* @return i=5!taxu}E
*/ krGIE}5
private int partition(int[] data, int l, int r,int pivot) { O-0 5.
do{ 'RwfW|~6
while(data[++l] while((r!=0)&&data[--r]>pivot); ^?|4<Rm
SortUtil.swap(data,l,r); BgN^].z&
} ;=2JbA+"G
while(l SortUtil.swap(data,l,r); /?BTET
return l; IUAe6
} !C4)P3k
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} l _2Xao$
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改进后的快速排序: -7oIphJ=\
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package org.rut.util.algorithm.support; Cm5L99Y
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import org.rut.util.algorithm.SortUtil; Mmgm6{
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/** @@a#DjE%/
* @author treeroot Bd*Ok]
* @since 2006-2-2 5k=04=Iyh#
* @version 1.0 G(A7=8vW
*/ d~.hp
public class ImprovedQuickSort implements SortUtil.Sort { #_Uo^Mw
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private static int MAX_STACK_SIZE=4096; <bn|ni|c"
private static int THRESHOLD=10; 7aRy])x
/* (non-Javadoc) .`*(#9(M9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) )%9:k9
*/ H [M:iV
public void sort(int[] data) { gdAd7
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int[] stack=new int[MAX_STACK_SIZE]; .R)Ho4CE
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int top=-1; WCaMPz
int pivot; U e-AF#
int pivotIndex,l,r; e Vj 8u
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stack[++top]=0; .$f0!`
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stack[++top]=data.length-1; , iEGf-!k
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while(top>0){ f&F9ImZ
int j=stack[top--]; >y}> 5kv
int i=stack[top--]; 7u1o>a%9
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pivotIndex=(i+j)/2; g}?39?o4
pivot=data[pivotIndex]; 8eCh5*_$
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SortUtil.swap(data,pivotIndex,j); H>\lE2
}If,O
//partition ,LOx!
l=i-1; 6QHUBm2
r=j; M"-53|#:w\
do{ eMOp}.zt|
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 1@-l@ P
SortUtil.swap(data,l,r); ?iaO+G&|
} rIyIZWkI
while(l SortUtil.swap(data,l,r); `^g-2~
SortUtil.swap(data,l,j); 0p,_?3nX
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if((l-i)>THRESHOLD){ t }K8{
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stack[++top]=i; pNHL &H\
stack[++top]=l-1; #VZ-gy4$\B
} .F/l$4CQ
if((j-l)>THRESHOLD){ I_c?Ky8J_|
stack[++top]=l+1; Q>z(!'dw
stack[++top]=j; (h&=Na~
} wO%617Av
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} G{+zKs}~
//new InsertSort().sort(data); gYpFF=7j<@
insertSort(data); :p1_ij]ND
} Oxi^&f||`
/** AAi4}
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* @param data j;_E0j#
*/ 1"l48NL L|
private void insertSort(int[] data) { b^~4 k; <
int temp; *TL3-S?
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); So NgDFD
} wG 5H^>6u>
} |>JRJ"CFE
} E0A[{UA
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} q)"yP\
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