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快速排序: =4+2y '
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package org.rut.util.algorithm.support; +(x(Ybl#
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import org.rut.util.algorithm.SortUtil; i;~.kgtq4
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/** W"s/8;
* @author treeroot 5+{oQs_
* @since 2006-2-2 5xKod0bA
* @version 1.0 KU"+i8"
*/ Il\{m?Y
public class QuickSort implements SortUtil.Sort{ |a])o
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/* (non-Javadoc) k {{eyC
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Wx#l}nD
*/
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public void sort(int[] data) { j@nK6`d+1
quickSort(data,0,data.length-1); JO]?u(m01
} LR.]&(kyd
private void quickSort(int[] data,int i,int j){ bO$KV"*!
int pivotIndex=(i+j)/2; b"o\-iUioe
//swap I3.JAoB>!
SortUtil.swap(data,pivotIndex,j); _0
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int k=partition(data,i-1,j,data[j]); <~ay4JY
SortUtil.swap(data,k,j); U43U2/^
if((k-i)>1) quickSort(data,i,k-1); `yl|NL
if((j-k)>1) quickSort(data,k+1,j); {TJ"O
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} jK\kASwG
/** SefF Ci%4
* @param data yo_zc<
* @param i J s33S)
* @param j i0\]^F
* @return #(}{*dR
*/ FDF DB
private int partition(int[] data, int l, int r,int pivot) { x/]G"?Uix
do{ {pXX%>
while(data[++l] while((r!=0)&&data[--r]>pivot); c'?EI EP
SortUtil.swap(data,l,r); 4+>~Ui_#
} pIrL7Pb0
while(l SortUtil.swap(data,l,r); Q+a&a]*KL^
return l; !+Cc^{
} TG?>;It&
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} ?^:5`
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改进后的快速排序: 7ko}X,aC
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package org.rut.util.algorithm.support; 0ZD)(ps|
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import org.rut.util.algorithm.SortUtil; `v(!IBP|
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/** m bhh
* @author treeroot 2b\h@VJt
* @since 2006-2-2 ,3GB9
* @version 1.0 " 5Pqvi
*/ dJQwb
public class ImprovedQuickSort implements SortUtil.Sort { "kc%d'c(
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private static int MAX_STACK_SIZE=4096; ,Cm1~ExJ
private static int THRESHOLD=10; {J)gS
/* (non-Javadoc) m(xyEU
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 'T|QG@q
*/ C@XnV=J
public void sort(int[] data) { F6DVq8f9
int[] stack=new int[MAX_STACK_SIZE]; d@ZXCiA},
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int top=-1; =yJc pj
int pivot; k'"R;^~xg
int pivotIndex,l,r; W>CG;x{
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stack[++top]=0; n|.>41bJ
stack[++top]=data.length-1; 9O&MsTmg$
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while(top>0){ um".Z4S
int j=stack[top--]; T.{]t6t$U
int i=stack[top--]; HD$r<bl
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pivotIndex=(i+j)/2; g_Y$5ft`
pivot=data[pivotIndex]; Q'e[(^8
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SortUtil.swap(data,pivotIndex,j); 5
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//partition CC`#2j
l=i-1; l,QO+
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r=j; sx[mbKj<
do{ ZI :wJU:f
while(data[++l] while((r!=0)&&(data[--r]>pivot)); D_z&G)
SortUtil.swap(data,l,r); Ba%b]vp
} `ST;";7!
while(l SortUtil.swap(data,l,r); dqt}:^L*0g
SortUtil.swap(data,l,j); .zW.IM}Z
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if((l-i)>THRESHOLD){ zU|'IW&
stack[++top]=i; 5NKyF
stack[++top]=l-1; ZQ\O|
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} Z2]\k|%<Fa
if((j-l)>THRESHOLD){ ZOJ7^g
stack[++top]=l+1; q+4<"b+6G
stack[++top]=j; 7bM
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} u]3VK
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} 9M[
//new InsertSort().sort(data); ` gor
insertSort(data); bHs},i6
} NU7k2`bqAk
/** gHvkr?Cg
* @param data wD pL9 q
*/ XPi5E"
private void insertSort(int[] data) { NQbgk+&wD
int temp;
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); EF6"PH+J@
} RL"hAUs_1
} srU*1jD)
} :?3y)*J!
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} 8\`otJY
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