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快速排序: jn'8F$GU
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package org.rut.util.algorithm.support; ?.H*!u+9>
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import org.rut.util.algorithm.SortUtil; 53c6dl
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/** 0NGokaD)H
* @author treeroot s]qfLC
* @since 2006-2-2 IM+PjYJ
* @version 1.0 R!=XMV3$PH
*/ >8##~ZuF+
public class QuickSort implements SortUtil.Sort{ v3B
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/* (non-Javadoc) \[BnAgsF
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) E4Sp^,
*/ AMr 9rB d
public void sort(int[] data) { Fpb1.Iz
quickSort(data,0,data.length-1); |N*>K a;
} sYL+;(#t
private void quickSort(int[] data,int i,int j){ =J,:j[D(
int pivotIndex=(i+j)/2; z'm;H{xf
//swap 5BZ5Gl3
SortUtil.swap(data,pivotIndex,j); d@<XR~);
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int k=partition(data,i-1,j,data[j]); R*U>T$
SortUtil.swap(data,k,j); RK,~mXA
if((k-i)>1) quickSort(data,i,k-1); Z7Kc`9.0|
if((j-k)>1) quickSort(data,k+1,j); 5R4 dN=L*1
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} :JlJB
/** \,WPFV
* @param data t?s1@}G^
* @param i #KIHq2:.4
* @param j JkKI/5h
* @return hE;
*/ ("{'],>
private int partition(int[] data, int l, int r,int pivot) { ojaZC,}
do{ z)ydQw>
while(data[++l] while((r!=0)&&data[--r]>pivot); @M1U)JoQ
SortUtil.swap(data,l,r); QAR<.zXvP
} 0wx`y$~R
while(l SortUtil.swap(data,l,r); YRK4l\_`
return l; @c/~qP4
} iZ{D_uxq
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} UZyo:*yB
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改进后的快速排序: fE(rDQI
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package org.rut.util.algorithm.support; 3V-pLs|
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import org.rut.util.algorithm.SortUtil; &ha39&I
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/** /t816,i
* @author treeroot NEX\+dtE~0
* @since 2006-2-2 N(D_*% 96
* @version 1.0 us/x.qPy2
*/ 1e}wDMU(
public class ImprovedQuickSort implements SortUtil.Sort { +Ta7b)
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private static int MAX_STACK_SIZE=4096; (mv8_~F0
private static int THRESHOLD=10; X@TQD
/* (non-Javadoc) [z?<'Tj
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) f;QWlh"9
*/ ,9=a(j"
public void sort(int[] data) { Nl1&na)K}
int[] stack=new int[MAX_STACK_SIZE]; */6PkNq
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int top=-1; CYz]tv}g:
int pivot; p 5P<3(
int pivotIndex,l,r; .Zo8KwkFY
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stack[++top]=0; =YI<L8@g~
stack[++top]=data.length-1; xmbkn}@A
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while(top>0){ euQd
int j=stack[top--]; u" nyx0<
int i=stack[top--]; 9"&HxyOfX
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pivotIndex=(i+j)/2; ;|66AIwDe
pivot=data[pivotIndex]; <wa}A!fu
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SortUtil.swap(data,pivotIndex,j); ZfS-W&6Z
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//partition p^NYJV
l=i-1; Drc\$<9c@
r=j; Jgb{Tl:r
do{ F8.Fp[_tM
while(data[++l] while((r!=0)&&(data[--r]>pivot)); !DXKn\aQf
SortUtil.swap(data,l,r); a>6!?:Rj
} V9][a
while(l SortUtil.swap(data,l,r); [/6IEt3}B
SortUtil.swap(data,l,j); Sky!ZN'I
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if((l-i)>THRESHOLD){ q8`JRmt)H
stack[++top]=i; ~#N^@a
stack[++top]=l-1; weKwBw
} u<:RSg
if((j-l)>THRESHOLD){ Z#%4QIz?
stack[++top]=l+1; g#W )EXUR
stack[++top]=j; 7C
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} :k#Y|(
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} AKejWh
//new InsertSort().sort(data); {O[a+r.n
insertSort(data); N.l+9L0b
} 7&qunK'
/** KYZ/b8C
* @param data ]W]o6uo7
*/ NN>,dd3T
private void insertSort(int[] data) { twq!@C
int temp; glm29hF
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ,)[u<&
} vm_+U*%c
} .IE2d%]?
} "l"zbW WOH
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} qn5e[Vn
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