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快速排序: *_\_'@1|J)
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package org.rut.util.algorithm.support; Q K<"2p?
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import org.rut.util.algorithm.SortUtil; V/9!K%y
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/** ee76L&:
* @author treeroot \d`h/tHk
* @since 2006-2-2 |[b{)s?x
* @version 1.0 ,UF_`|
*/ kVLS
public class QuickSort implements SortUtil.Sort{ v_GUNRs
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/* (non-Javadoc) gT6jYQ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) s&3Vg7B
*/ )oPBa
public void sort(int[] data) { bq0zxg%
quickSort(data,0,data.length-1); Vp@?^imL
} Em~>9f
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private void quickSort(int[] data,int i,int j){ }`m/bgtFX
int pivotIndex=(i+j)/2; 3eQ&F~S
//swap YNsJZnGr8#
SortUtil.swap(data,pivotIndex,j); $kp{Eg '
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int k=partition(data,i-1,j,data[j]); NyNXP_8
SortUtil.swap(data,k,j); ' %o#q6O
if((k-i)>1) quickSort(data,i,k-1); WX3-\Y5E
if((j-k)>1) quickSort(data,k+1,j); "87:?v[[1
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} sdw(R#GE
/** =]0&i]z[.
* @param data {kR#p %E]
* @param i > /caXvS
* @param j )bscBj@
* @return ][Rh28?I{
*/ FJ)$f?=Qd
private int partition(int[] data, int l, int r,int pivot) { n,WqyNt*
do{ -m~#Bq
while(data[++l] while((r!=0)&&data[--r]>pivot); gV_}-VvP
SortUtil.swap(data,l,r); 4~Q/"hMSkO
} >}6%#CAf
while(l SortUtil.swap(data,l,r); draN0vf
return l; wNd isI
} V)N%WXG
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} \(2sW^fY
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改进后的快速排序: ,r\o}E2
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package org.rut.util.algorithm.support; P71Lqy)5}A
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import org.rut.util.algorithm.SortUtil; WNrk}LFof
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/** E+;7>ja
* @author treeroot </*6wpN
* @since 2006-2-2 ]N F[>uiW
* @version 1.0 7WZ+T"O{I
*/ ePo}y])2
public class ImprovedQuickSort implements SortUtil.Sort { {9q4)R}G
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private static int MAX_STACK_SIZE=4096; BLD gt~h#
private static int THRESHOLD=10; +@wD qc
/* (non-Javadoc) *(DV\. l`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) vUM4S26"NT
*/ P+/e2Y
public void sort(int[] data) { zIAD9mQex
int[] stack=new int[MAX_STACK_SIZE]; l2Rb\4
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int top=-1; A2Gevj?F$
int pivot; s!$7(Q86R
int pivotIndex,l,r; k;FUs[
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stack[++top]=0; ^k9I(f^c-_
stack[++top]=data.length-1; wI/iuc
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while(top>0){ =B @2#W#
int j=stack[top--]; {R6ZKB
int i=stack[top--]; $6SW;d+>n
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pivotIndex=(i+j)/2; v`
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pivot=data[pivotIndex]; _I5Y"o
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SortUtil.swap(data,pivotIndex,j); j&qub_j"xX
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//partition %1+4_g9
l=i-1; (SAs-
r=j; [d]9Oa4
do{ )+9Uoe~6
while(data[++l] while((r!=0)&&(data[--r]>pivot)); $~T4hv :
SortUtil.swap(data,l,r); <wD-qT W
}
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while(l SortUtil.swap(data,l,r); nAdf=D'P
SortUtil.swap(data,l,j); 0<@@?G
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if((l-i)>THRESHOLD){ 'TB2:W3
stack[++top]=i; _X
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stack[++top]=l-1; 13x p_j
} --BW9]FW
if((j-l)>THRESHOLD){ =@~Y12o?%
stack[++top]=l+1; '}Z<h?9
stack[++top]=j; ' S/gmn
} fe_5LC"
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} GnJt0 {
//new InsertSort().sort(data); G]&qx`TBK
insertSort(data); }Jj}%XxKs
} nAlQ7'
/** +mT_QsLEv
* @param data |+D!=
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*/ KoT%Mfu
private void insertSort(int[] data) { FfT`;j
int temp; .8JTe0
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 88$8d>-
} f]srRYSR
} c@L< Z` u
} U| R_OLWAg
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} DkDmE
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