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快速排序: \V~B+e
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package org.rut.util.algorithm.support; :tENn
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import org.rut.util.algorithm.SortUtil; <OiH%:G/1
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/** ]@_|A, ]
* @author treeroot hAgrs[OFj
* @since 2006-2-2 \`8$bpW[nS
* @version 1.0 &|IO+'_
*/ &OvA[<qT
public class QuickSort implements SortUtil.Sort{ W<#Kam:8e
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/* (non-Javadoc) C^?/9\
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) jz3f{~
*/ 3
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public void sort(int[] data) { pl}W|kW}
quickSort(data,0,data.length-1); Cf 202pF3y
} 0}Kyj"-3
private void quickSort(int[] data,int i,int j){ Nt
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int pivotIndex=(i+j)/2; shLMj)7!
//swap S!-t{Q+j^
SortUtil.swap(data,pivotIndex,j); O>*Vo!z\f
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int k=partition(data,i-1,j,data[j]); p*jH5h cy
SortUtil.swap(data,k,j); ,*[N_[
if((k-i)>1) quickSort(data,i,k-1); 1 )u,%
if((j-k)>1) quickSort(data,k+1,j); r"|do2s
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} U8aNL
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/** 3W[||V[r]<
* @param data \0*dKgN
* @param i _+Z;pt$C
* @param j H H3Z?g
* @return AO-~dV
*/ \"I418T K
private int partition(int[] data, int l, int r,int pivot) { 9qq6P!
do{ 0W
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while(data[++l] while((r!=0)&&data[--r]>pivot); ,-n_(U
SortUtil.swap(data,l,r); =q[+e(,3
} (Ms0pm-#t
while(l SortUtil.swap(data,l,r); cr18`xU
return l; IUWJi\,
} PE_JO(e;Xm
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改进后的快速排序: U[pR`u
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package org.rut.util.algorithm.support; Wa!C2nB
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import org.rut.util.algorithm.SortUtil; 1k%HGQM{
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/** C
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* @author treeroot 1vh[sKv9%
* @since 2006-2-2 VYK%0S9yH[
* @version 1.0 #|V)>")
*/ on7?V<
public class ImprovedQuickSort implements SortUtil.Sort { SJ,];mC0
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private static int MAX_STACK_SIZE=4096; :VR%I;g ;
private static int THRESHOLD=10; Q{
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/* (non-Javadoc) !6 kn>447Y
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ey:%Zy
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*/ ##"
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public void sort(int[] data) { bdBLfWe
int[] stack=new int[MAX_STACK_SIZE]; ;e2D}
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int top=-1; y
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int pivot; i"^ yy+
int pivotIndex,l,r; 7 $Cv=8
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stack[++top]=0; s?9`dv}P
stack[++top]=data.length-1; /.UISArH
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while(top>0){ (V}?y:)
int j=stack[top--]; )ItW}1[I
int i=stack[top--]; nx!+:P ,
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pivotIndex=(i+j)/2; GG4FS
pivot=data[pivotIndex]; Jg&f.
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SortUtil.swap(data,pivotIndex,j); $GD
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//partition 0\1g-kc!v
l=i-1; S""F58H n
r=j; bhKe"#m|S
do{ pe!"!xJE
while(data[++l] while((r!=0)&&(data[--r]>pivot)); R$2\Xl@qQF
SortUtil.swap(data,l,r); i66/2BUh.
}
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while(l SortUtil.swap(data,l,r); AgOti]`aR
SortUtil.swap(data,l,j); C)cuy7<
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if((l-i)>THRESHOLD){ +WCV"m
stack[++top]=i; L7yEgYB
stack[++top]=l-1; F~GIfJU
} AI$\wp#aw
if((j-l)>THRESHOLD){ `{ \)Wuw
stack[++top]=l+1; DU@SXb
stack[++top]=j; ~qE:Nz0@
} `nd$6i^#W
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} "Qk)EY
//new InsertSort().sort(data); .sZ"|j9m
insertSort(data); Wm!cjGK
} \5#eBJ
/** A4)TJY
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* @param data 5_rx$avm
*/ /vLW{ %
private void insertSort(int[] data) { DH])Q5
int temp; .aC/ g?U
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 7Y
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} G#. q%Up
} (Wn^~-`=+
} Xz'o<S
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} G[zVGqk
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