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快速排序: yt:V+qdv
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package org.rut.util.algorithm.support; gi@ji-10
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import org.rut.util.algorithm.SortUtil; wJ*-K-
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/** ?^4sE-C6
* @author treeroot Y_hRL&u3W
* @since 2006-2-2 wQB{K3
* @version 1.0 ~ O=| v/]
*/ )^f
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public class QuickSort implements SortUtil.Sort{ R9G)X]
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/* (non-Javadoc) =c^=Yvc7U
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) WVK-dBU
*/ chzR4"WZFt
public void sort(int[] data) { D-:<]D:
quickSort(data,0,data.length-1); 0.+eF }'H
} pF+wHMhUe
private void quickSort(int[] data,int i,int j){ +J8/,d
int pivotIndex=(i+j)/2; 9$@ g;?}Ps
//swap ~c$ts&Cl
SortUtil.swap(data,pivotIndex,j); C?|3\@7
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int k=partition(data,i-1,j,data[j]); N@a'd0oTd
SortUtil.swap(data,k,j); |ZlT>u
if((k-i)>1) quickSort(data,i,k-1); $:
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if((j-k)>1) quickSort(data,k+1,j); y$V)^-U>fw
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} .|`=mx
/** >=:T
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* @param data C-^%g[#
* @param i Z1&GtM
* @param j 9Ru%E>el-
* @return 9|A-oS
*/ ruA+1-<f
private int partition(int[] data, int l, int r,int pivot) { 13_~)V
do{ bRz^=
while(data[++l] while((r!=0)&&data[--r]>pivot); -7z y
SortUtil.swap(data,l,r); *oX]=u&
} pQ(eF0KG
while(l SortUtil.swap(data,l,r); _Ge^
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return l; 5=h'!|iY
} 5po'(r|U
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} C!k9 JAa$Z
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改进后的快速排序: b\j&!_
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package org.rut.util.algorithm.support; VSpt&19
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import org.rut.util.algorithm.SortUtil; KSB_%OI1
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/** + >gbZ-S
* @author treeroot nf.:5I.
* @since 2006-2-2 @))}\:
* @version 1.0 qTh='~m4[
*/ ka)LK@p6
public class ImprovedQuickSort implements SortUtil.Sort { eGe[sv"k
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private static int MAX_STACK_SIZE=4096; ~73i^3yf
private static int THRESHOLD=10; <kXV1@>
/* (non-Javadoc) &Pg-|Ql
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) K&IrTA
j}
*/ jw(>@SXz
public void sort(int[] data) { 26#Jhb E+
int[] stack=new int[MAX_STACK_SIZE]; /.kna4k
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int top=-1; y(3c{y@~X
int pivot; Ma=6kX]
int pivotIndex,l,r; }vUlTH
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stack[++top]=0; `KJYm|@ i
stack[++top]=data.length-1; {[t"O u
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while(top>0){ FO(0D?PCR
int j=stack[top--]; <r +!hJ[s'
int i=stack[top--]; Cs[7% j
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pivotIndex=(i+j)/2; i
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pivot=data[pivotIndex]; =Kt9,d08x
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SortUtil.swap(data,pivotIndex,j); Ns!3- Y
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//partition H
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l=i-1; &Ky u@Tt
r=j; 0gOrW=
do{ Rw/JPC"
while(data[++l] while((r!=0)&&(data[--r]>pivot)); yLgKS8b
SortUtil.swap(data,l,r); 2}Z4a\YX
} ',H$zA?i
while(l SortUtil.swap(data,l,r); 42J';\)oP
SortUtil.swap(data,l,j); 1ntkM?
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if((l-i)>THRESHOLD){ L;--d`[
stack[++top]=i; }6CXJ+-UR
stack[++top]=l-1; N;x<| %peL
} LE<u&9I\
if((j-l)>THRESHOLD){ ~6-"i0k
stack[++top]=l+1; si^4<$Nr%j
stack[++top]=j; Z`oaaO
} G_^iR-
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} 5&?KW)6 Rz
//new InsertSort().sort(data); (3N"oE.b]
insertSort(data); [<Os~bfOv
} ia^%Wg7
/** 5qd_>UHp
* @param data XYb^Cs;
*/ KZrMf77=
private void insertSort(int[] data) { iF [?uF
int temp; 4z9#M;qT
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); c:llOHA
} =CjNtD2]
} &}nBenYp
} !]rETP_
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} f8LrDR
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