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快速排序: eRV4XB :
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package org.rut.util.algorithm.support; ^Yu<fFn
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import org.rut.util.algorithm.SortUtil; oUXi4lsSc
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/** +-8S,Rg@
* @author treeroot T_T@0`7
* @since 2006-2-2 !{hC99q6
* @version 1.0 |/Q7 o1i
*/ ~CTe5PX c
public class QuickSort implements SortUtil.Sort{ ?;{d
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/* (non-Javadoc) Pr|:nJs
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) oaxCcB=\
*/ CJ'pZ]\G
public void sort(int[] data) { 53vnON#{*
quickSort(data,0,data.length-1); 6;|6@j
} Id_?
private void quickSort(int[] data,int i,int j){ yWsJa)e3*@
int pivotIndex=(i+j)/2; uU+R,P0
//swap bU3e*Er
SortUtil.swap(data,pivotIndex,j); (~}P.?C8
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int k=partition(data,i-1,j,data[j]); os<YfMM<:/
SortUtil.swap(data,k,j); /E(319u_
if((k-i)>1) quickSort(data,i,k-1); mPhrMcL
if((j-k)>1) quickSort(data,k+1,j); Ab|
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} q#}#A@Rg
/** {\HEUIa]w
* @param data x d9+P
* @param i -1~-uE.~4d
* @param j eN]AJ%Ig
* @return 8 K7.; t1
*/ km%c0:
private int partition(int[] data, int l, int r,int pivot) { 2;!,:bFb
do{ k`#OXLR
while(data[++l] while((r!=0)&&data[--r]>pivot); k)'y;{IN
SortUtil.swap(data,l,r); G{wIY" ~4
} d<x7* OW)
while(l SortUtil.swap(data,l,r); n+ot. -
return l; rt5FecX\
} ape\zZCV
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改进后的快速排序: ~Bw)rf,
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package org.rut.util.algorithm.support; %Y0,ww2
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import org.rut.util.algorithm.SortUtil; 0[/GEY@
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/** T4
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* @author treeroot )9oF?l^q
* @since 2006-2-2 tBJCfM
* @version 1.0 H8$l }pOz
*/ U-b(
public class ImprovedQuickSort implements SortUtil.Sort { PTt#Ixn,
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private static int MAX_STACK_SIZE=4096; .mr&zq
private static int THRESHOLD=10;
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/* (non-Javadoc) 7yUtG^'b
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) U,;a+z4\
*/ 8ClOd<I
public void sort(int[] data) { z' oK
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int[] stack=new int[MAX_STACK_SIZE]; !06
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int top=-1; r)4GH%+?fv
int pivot; TnuNoMD.
int pivotIndex,l,r; !+<OED=qe
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stack[++top]=0; E:_m6
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stack[++top]=data.length-1; D'Fj"&LK
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while(top>0){ \3WF-!xe
int j=stack[top--]; .el&\Jt
int i=stack[top--]; :NHP,"
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pivotIndex=(i+j)/2; Wqy\yS [
pivot=data[pivotIndex]; 5c8tH=
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SortUtil.swap(data,pivotIndex,j); QsXy(w#F
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//partition *VP-fyJp
l=i-1; [Dzd39aKr
r=j; t\\oGH
do{ ZqONK^
while(data[++l] while((r!=0)&&(data[--r]>pivot)); PU& v{gn
SortUtil.swap(data,l,r); -@I+IKz
} 2aDjt{7P
while(l SortUtil.swap(data,l,r); ` FJ2
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SortUtil.swap(data,l,j); u0o}rA
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if((l-i)>THRESHOLD){ $u ae8h
stack[++top]=i; `rWT^E@p5m
stack[++top]=l-1; 5.IX
} pW
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if((j-l)>THRESHOLD){ tz6N,4J?
stack[++top]=l+1; tPQjjoh
stack[++top]=j; ?o>JX.Nl&7
} B'AU~#d
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} t.s;dlx[@
//new InsertSort().sort(data); +o ;}*
insertSort(data); pHftz-RS!
} QEC4!$L^
/** S;I>W&U
* @param data ]Yw/}GKB
*/ p;x3gc;0
private void insertSort(int[] data) { "sD[P3
int temp; _aaQ1A`p
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); KUE}^/%z
} G/)]aGr
} lihV! 1
} fPpFAO
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} pXE'5IIN
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