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快速排序: e\)PGjSI
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package org.rut.util.algorithm.support; M,7v}[Tbl
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import org.rut.util.algorithm.SortUtil; B>JRta;hj
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/** Bf8 #&]O
* @author treeroot C7nLa@
* @since 2006-2-2 i5rAb<q`
* @version 1.0 g4U%(3,>D
*/ }PoB`H'K5
public class QuickSort implements SortUtil.Sort{ G"C'/
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/* (non-Javadoc) QV" |
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) p6sXftk
*/ k3u3X~u
public void sort(int[] data) { SkS
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quickSort(data,0,data.length-1); Id9hC<8$dq
} teET nz_L
private void quickSort(int[] data,int i,int j){ A?Uyj
int pivotIndex=(i+j)/2; 7=}`"7i~
//swap Y68oBUd_E
SortUtil.swap(data,pivotIndex,j); sv
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int k=partition(data,i-1,j,data[j]); Q
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SortUtil.swap(data,k,j); -cOLgrmp
if((k-i)>1) quickSort(data,i,k-1); A5z5e#
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if((j-k)>1) quickSort(data,k+1,j); N U\B
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} Z}WMpp^r
/** )$Mgp*?
* @param data Ia[e7
* @param i <AzvVSA,
* @param j eR =P
* @return ]^E<e!z={$
*/ g&X$)V4C
private int partition(int[] data, int l, int r,int pivot) { =M>pL+#
do{ F!'y47QD
while(data[++l] while((r!=0)&&data[--r]>pivot); tpU[KR[-
SortUtil.swap(data,l,r); *i&ks>4N
} K&\xbT
while(l SortUtil.swap(data,l,r); <-FAF:6$@@
return l; E]i3E[T
} `!
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} '4ftclzL
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改进后的快速排序: Qv|A^%Ub!
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package org.rut.util.algorithm.support; R8sj>.I9j
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import org.rut.util.algorithm.SortUtil; 4uwI=U UB
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/** bU7n1pzW,o
* @author treeroot ol[
* @since 2006-2-2 !T!U@e=u
* @version 1.0 xhWWl(r`5
*/ ;3'ta!.c
public class ImprovedQuickSort implements SortUtil.Sort { :H@Q`g u
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private static int MAX_STACK_SIZE=4096; GU([A@;
private static int THRESHOLD=10; zT
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/* (non-Javadoc) }CIH1q3P
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) A_i=hj2f
*/ 9rf6,hF
public void sort(int[] data) { 'H0uvvhOp
int[] stack=new int[MAX_STACK_SIZE]; il|e5TD^
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int top=-1; ~+
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int pivot; \C#XKk$OE
int pivotIndex,l,r; \QGh@AQp"
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stack[++top]=0; )[oegfnn-
stack[++top]=data.length-1; N2#Wyt8MC
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while(top>0){ Y23- Im
int j=stack[top--]; oc7&iL
int i=stack[top--]; AY<(`J{
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pivotIndex=(i+j)/2; H`d595<=i;
pivot=data[pivotIndex]; fh,kbn==r?
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SortUtil.swap(data,pivotIndex,j); B]iPixA6
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//partition *t=8^q(K[
l=i-1; LDc?/
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r=j; ~.7/o0'+
do{ )31{.c/
while(data[++l] while((r!=0)&&(data[--r]>pivot)); KPHtD4
SortUtil.swap(data,l,r); K2|2Ks_CS
} |Tv}leJF
while(l SortUtil.swap(data,l,r); lY
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SortUtil.swap(data,l,j); 3dheT}XV?p
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if((l-i)>THRESHOLD){
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stack[++top]=i; Di)%vU
stack[++top]=l-1; 3b{ 7Z 2
} wz`\RHL
if((j-l)>THRESHOLD){ amvD5
stack[++top]=l+1; Mu: y9o95
stack[++top]=j; }:+SA
} &rs
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} Jui:Ms
//new InsertSort().sort(data); }$%j} F{
insertSort(data); J'}G~rB<<
} ~?#>QN\\c
/** F \0>/
* @param data n#$sLXVy
*/ 5ir
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private void insertSort(int[] data) { L)(JaZyV5
int temp; >f$NG
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); #K#BNpG|
} 7XzhKA6
} p+7G
} 3']a1\sy^
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} W>#[a %R
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