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快速排序: {uEu>D$8
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package org.rut.util.algorithm.support; nrI"k2oA@
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import org.rut.util.algorithm.SortUtil; kHGeCJe\{
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/** G2=F8kL
* @author treeroot N/(ofy
* @since 2006-2-2 A\Lr<{Jh
* @version 1.0 W;q#ZD(;
*/ 8I<_w4fC
public class QuickSort implements SortUtil.Sort{ U.Pa7tn
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/* (non-Javadoc) Th.3j's
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) q|R+x7x
*/ }Q,(u
public void sort(int[] data) { x`Vy<h 33
quickSort(data,0,data.length-1); l#tS.+B7
} \)uy"+ Z`
private void quickSort(int[] data,int i,int j){ CM`x>J
int pivotIndex=(i+j)/2; PG\\V$}A(
//swap dko [
SortUtil.swap(data,pivotIndex,j); Z`^
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int k=partition(data,i-1,j,data[j]);
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SortUtil.swap(data,k,j); 5wT',U"+
if((k-i)>1) quickSort(data,i,k-1); C<zx'lw!
if((j-k)>1) quickSort(data,k+1,j); ] dW%g?
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} +I^+k "
/** E6,`Ld;c[
* @param data hVQ7'@
* @param i rd|@*^k
* @param j hdo+Qezu:
* @return _Jf J%YXy
*/ HR/k{"8W4Q
private int partition(int[] data, int l, int r,int pivot) { i)A`Vpn
do{ R
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while(data[++l] while((r!=0)&&data[--r]>pivot); _bN))9
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SortUtil.swap(data,l,r); Ej;Vr~Wi
} N{?Tm`""
while(l SortUtil.swap(data,l,r); *O2^{ C
return l; YR$tPe
} =YS!soO
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} ,\.YJD>z
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改进后的快速排序: S/#) :,YS
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package org.rut.util.algorithm.support; /ig^7+#
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import org.rut.util.algorithm.SortUtil; ?7rmwy\
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/** e["Z!D_H
* @author treeroot jldcvW
* @since 2006-2-2 nOA,x
* @version 1.0 ` 4s#5g
*/ fS;m+ D!j@
public class ImprovedQuickSort implements SortUtil.Sort { &4ug3
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private static int MAX_STACK_SIZE=4096; m?
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private static int THRESHOLD=10; z/c'Z#w%
/* (non-Javadoc) {[(W4NAlH
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *@b~f&Lx6
*/ g7E`;&f
public void sort(int[] data) { mI_ 6f~
int[] stack=new int[MAX_STACK_SIZE]; $g}/T_26
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int top=-1; $G^H7|PzdC
int pivot; i]hR7g<
int pivotIndex,l,r; \kua9bK
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stack[++top]=0; ijR-?nrR
stack[++top]=data.length-1; tA;ZW2$#
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while(top>0){ D9@<#2-
int j=stack[top--]; ,=XS%g}l4
int i=stack[top--]; YQfZiz}Fv
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pivotIndex=(i+j)/2; j,gM+4V^
pivot=data[pivotIndex]; l:k E^ =6
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SortUtil.swap(data,pivotIndex,j); qZyt>SAx
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//partition $yR{ZFo
l=i-1; j3V"d 3)
r=j; 52q!zx E
do{ \a~;8):q=i
while(data[++l] while((r!=0)&&(data[--r]>pivot)); Bt`r6v;\
SortUtil.swap(data,l,r); ;r2b@x:<_
} ej??j<]
while(l SortUtil.swap(data,l,r); FrE/K_L
SortUtil.swap(data,l,j); 4^jZv$l5
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if((l-i)>THRESHOLD){ * Kp ^al
stack[++top]=i; ,M9hb<:m
stack[++top]=l-1; 37<GG)
} })yb
if((j-l)>THRESHOLD){ CsQ}P)
stack[++top]=l+1; u0$5Fd&X
stack[++top]=j; N]<~NG:6b
} im^I9G
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} rnt$BB[g
//new InsertSort().sort(data); 5"Xo R)
insertSort(data); H603L|4
} 5D q{"@E
/**
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* @param data s\K-(`j}
*/ RAXJsF^5o
private void insertSort(int[] data) { E'6z7m.
int temp; :fMM-?s]
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); a6K$omu
} BRQ5
} nh_xbo5L[
} @o-evH;G
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} <i`K%+<WO
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