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快速排序: PVP,2Yq!
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package org.rut.util.algorithm.support; F1JSf&8
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import org.rut.util.algorithm.SortUtil; #~3x^4Y
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/** 3UU]w`At
* @author treeroot |RDmY!9&
* @since 2006-2-2 T)&J}^j
* @version 1.0 f#_ XR
*/ kT@RA}
public class QuickSort implements SortUtil.Sort{ ,DK |jf
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/* (non-Javadoc) /=w9bUj5v
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9_h3<3e
*/ 5!$m3j_,]?
public void sort(int[] data) { O{ zY(`[
quickSort(data,0,data.length-1); C7[ge&
} 0#lw?sv
private void quickSort(int[] data,int i,int j){ _QbLg"O
int pivotIndex=(i+j)/2; mr6/d1af_
//swap ;>QED
SortUtil.swap(data,pivotIndex,j); Rq gH,AN
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int k=partition(data,i-1,j,data[j]); VgtWT`F.I
SortUtil.swap(data,k,j); 1@q~(1-o
if((k-i)>1) quickSort(data,i,k-1); vDZhoD=VR
if((j-k)>1) quickSort(data,k+1,j); R$'4 d
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} _I8L#4\(=
/** W7>4-gk
* @param data 5tT-[mQ*
* @param i agQzA/Xt
* @param j 0L"CM?C
* @return iwWy]V m7
*/ |-4C[5rM
private int partition(int[] data, int l, int r,int pivot) { A"x1MjuqLM
do{ gvvl3`S{
while(data[++l] while((r!=0)&&data[--r]>pivot); ^wPKqu)^
SortUtil.swap(data,l,r); lwYk`'
} oEbgyT gB
while(l SortUtil.swap(data,l,r); oJe9H <
return l; P1;T-.X~&
} g9|B-1[
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} #c@Dn.W
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改进后的快速排序: ^8$CpAK]M
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package org.rut.util.algorithm.support; Ni*f1[sI<
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import org.rut.util.algorithm.SortUtil; Y$b4Ga9j
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/** Bzn{~&i?W:
* @author treeroot `<kHNcm
* @since 2006-2-2 <8Ek-aNNt
* @version 1.0 ,oX48Wg_+
*/ 4b=hFwr[?
public class ImprovedQuickSort implements SortUtil.Sort { CZRrb 84
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private static int MAX_STACK_SIZE=4096; cE>K:3n
private static int THRESHOLD=10; {[G2{ijRz
/* (non-Javadoc) ]vJZ v"ACn
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) O&l(`*P
*/ K]' 84!l
public void sort(int[] data) { p8K4^H
int[] stack=new int[MAX_STACK_SIZE]; yaD<jc(O
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int top=-1; zIt-mU
int pivot; U^vQr%ha
int pivotIndex,l,r; s^ rO I~
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stack[++top]=0; fiOc;d8
stack[++top]=data.length-1; 8T92;.~(
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while(top>0){ ";}Lf1M9
int j=stack[top--]; Vd3'dq8/?
int i=stack[top--]; l%\3'N]
}uo5rB5D
pivotIndex=(i+j)/2; s
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pivot=data[pivotIndex]; o0$R|/>i
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SortUtil.swap(data,pivotIndex,j); 26JP<&%L
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//partition *k==2figz
l=i-1; \kcJF'JFA0
r=j; z_R^n#A~r
do{ JL $6Fw;
while(data[++l] while((r!=0)&&(data[--r]>pivot)); fpf1^TZ
SortUtil.swap(data,l,r); LSb3w/3M
} Pc>$[kT0
while(l SortUtil.swap(data,l,r); r)Ts(#Z
SortUtil.swap(data,l,j); } Uki)3(
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if((l-i)>THRESHOLD){ |0FRKD]
stack[++top]=i; t^ LXGQ
stack[++top]=l-1; _ _cJ+%e
} ~E-YXl9
if((j-l)>THRESHOLD){ ,!t1( H
stack[++top]=l+1; v{`Z
stack[++top]=j; K y~
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} 6l&m+!i
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} jUtrFl
//new InsertSort().sort(data); 16/+ O$#y
insertSort(data); <_@ K4zV
} 6}
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/** KK4>8zGR
* @param data *6 -;iT8
*/ 6la# 0U23
private void insertSort(int[] data) {
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int temp; +*'
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); J XKps#,(#
} _?>!Bz
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} (1JZuR<?c
} 3lH#+@
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} #S2LQ5U
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