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快速排序: NQS@i'W=g
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package org.rut.util.algorithm.support; AD$k`Cj
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import org.rut.util.algorithm.SortUtil; A-gNfXP,D
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/** ;}),6R
* @author treeroot )%p.v P'p
* @since 2006-2-2 }5dYmny
* @version 1.0 zA[6rYXY
*/ O)C
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public class QuickSort implements SortUtil.Sort{ aH<BqD[#
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/* (non-Javadoc) 5^'PjtW6
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ?CGbnXZ4Ug
*/ ~?&;nTwHe
public void sort(int[] data) { v{4K$o
quickSort(data,0,data.length-1); "'p;Udt/Qm
} \M^L'Mkj
private void quickSort(int[] data,int i,int j){ %v=z|d5-3
int pivotIndex=(i+j)/2; krwY_$q
//swap 3XY;g{`=q
SortUtil.swap(data,pivotIndex,j); `-!t 8BH
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int k=partition(data,i-1,j,data[j]); l
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SortUtil.swap(data,k,j); KB+,}7
if((k-i)>1) quickSort(data,i,k-1); Y%!3/3T
if((j-k)>1) quickSort(data,k+1,j); *44^M{ti<
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} [su2kOX|X
/** 9?B}CCE<LR
* @param data J =o,: 3"
* @param i IT&
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* @param j INrl^P*
* @return w J
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*/ A `\2]t$z
private int partition(int[] data, int l, int r,int pivot) { -;=0dfC(
do{ bnBnE[y<'
while(data[++l] while((r!=0)&&data[--r]>pivot); F
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SortUtil.swap(data,l,r); 0-#SvTf>;:
} Q#NXJvI
while(l SortUtil.swap(data,l,r); s,>_kxuX
return l; O o9 ePw7
} i)fAm$8#G
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} Y$SZqW0!/
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改进后的快速排序: =YlsJ={h
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package org.rut.util.algorithm.support; BeZr5I"`}
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import org.rut.util.algorithm.SortUtil; oiYI$ql3L
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/** F VBuCi?W
* @author treeroot c6gRXp'ID
* @since 2006-2-2 R,[dEP
* @version 1.0 xab1`~%K
*/ E
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public class ImprovedQuickSort implements SortUtil.Sort { wi/Fx=w
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private static int MAX_STACK_SIZE=4096; 7Pspx'u
private static int THRESHOLD=10; W0%cJ8~
/* (non-Javadoc) 5X>b(`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) c?oNKqPzg
*/ M.|O+K z
public void sort(int[] data) { t-_~jZ<
int[] stack=new int[MAX_STACK_SIZE]; #DjSS.iW
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int top=-1; csP 5R3
int pivot; b*w izd
int pivotIndex,l,r; e1a8>>bcI
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stack[++top]=0; k2{*WF
stack[++top]=data.length-1; "&(.Z (
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while(top>0){ ?B>
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int j=stack[top--]; {RFpTh7f:
int i=stack[top--]; tow0/Jt
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pivotIndex=(i+j)/2; #~]S
pivot=data[pivotIndex]; LbX>@2(&
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SortUtil.swap(data,pivotIndex,j); Cx(|ZD^
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//partition Q;A1&UA2
l=i-1; Er(
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r=j; ph*9,\c8
do{ G&qO{" Js
while(data[++l] while((r!=0)&&(data[--r]>pivot)); yH}(0
SortUtil.swap(data,l,r); B->3/dp2c'
} m$b5Vqq
while(l SortUtil.swap(data,l,r); 1.p2{
SortUtil.swap(data,l,j); 9K~0:c
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if((l-i)>THRESHOLD){ kY d'6+m
stack[++top]=i; Q+L;k
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stack[++top]=l-1; !EO*xxQ
} \*] l'>x1
if((j-l)>THRESHOLD){ G i1Jl"
stack[++top]=l+1; Wp7lDx
stack[++top]=j; )F_0('=t
} VRe7Q0
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} ) -yJKmV
//new InsertSort().sort(data); \VQv
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insertSort(data); Udj!y$?
} / =]h@m-`
/** 6T*MKu
* @param data L'1!vu *Rg
*/ i_/A,5TF
private void insertSort(int[] data) { u@ MUcW
int temp; T22
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); S87E$k
} N{/):O
} 9]u=b\fzZ
} (2 nSZRB
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} \#)|6w-
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