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快速排序: ?jy6%Y#,i
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package org.rut.util.algorithm.support; uL1$yf'
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import org.rut.util.algorithm.SortUtil; ,LpG E>s
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/** s?-J`k~q
* @author treeroot ;VlA~tv
* @since 2006-2-2 Sru}0M#M
* @version 1.0 l$mfsm|{:
*/ SIr^\iiOB
public class QuickSort implements SortUtil.Sort{ )HPe}(ypt
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/* (non-Javadoc) %"{jNC?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) [t.x cO
*/ ,- FC
public void sort(int[] data) { IN#Z(FMVC
quickSort(data,0,data.length-1); X@cO`P
} 2F-
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private void quickSort(int[] data,int i,int j){ ^9wQl!e
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int pivotIndex=(i+j)/2; 8/oO}SLF
//swap l:?w{'i$
SortUtil.swap(data,pivotIndex,j); gxf{/EjH
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int k=partition(data,i-1,j,data[j]); 4,.B#: 8
SortUtil.swap(data,k,j); i{.%4tA4
if((k-i)>1) quickSort(data,i,k-1); Qe,aIh
if((j-k)>1) quickSort(data,k+1,j); 6'YsSde".
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} Cg 4l*"_
/** hantGw|
* @param data 0Xx&Z8E
* @param i xfsf
* @param j kH9P(`;Vq
* @return 64jFbbd-/
*/ )*tV
private int partition(int[] data, int l, int r,int pivot) { WD${f#]N
do{ hNWZ1r~_
while(data[++l] while((r!=0)&&data[--r]>pivot);
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SortUtil.swap(data,l,r); =MCQNyf+
} pjVF^gv,*
while(l SortUtil.swap(data,l,r); ICxj$b
return l; XI"8d.VR
} K[/sVaPZ
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} U`w `Cr
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改进后的快速排序: `of`u B
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package org.rut.util.algorithm.support; m(6SiV=D9
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import org.rut.util.algorithm.SortUtil; /CW
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/** {@tqeu%IM
* @author treeroot @UgZZ
* @since 2006-2-2 d=~-8]%\
* @version 1.0 ?^l{t4
*/ 52H'aHO1
public class ImprovedQuickSort implements SortUtil.Sort { b IZuZF>*
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private static int MAX_STACK_SIZE=4096; n +R3
private static int THRESHOLD=10; KbP( ;
/* (non-Javadoc) Iq%f*Zm<
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) FWu[{X;
*/ y53f73Cg
public void sort(int[] data) { :e|[gEA
int[] stack=new int[MAX_STACK_SIZE]; :1/K$A)^{
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int top=-1; 40ZHDtIu<
int pivot;
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int pivotIndex,l,r; W7 iml|WV0
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stack[++top]=0; |)'6U3
stack[++top]=data.length-1; =}h8Cl{H/
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while(top>0){ hnf7Q l}
int j=stack[top--]; #x^dR-@
int i=stack[top--]; Cvk n2T
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pivotIndex=(i+j)/2; L
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pivot=data[pivotIndex]; S, g/2k*
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SortUtil.swap(data,pivotIndex,j); dd=';%?
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//partition WBIJ9e2~
l=i-1; p#fd+
r=j; miCW(mbO8
do{ )4@La&
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ;3 |Z}P
SortUtil.swap(data,l,r); "B9aJo
} l{u2W$8
while(l SortUtil.swap(data,l,r); 3\~
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SortUtil.swap(data,l,j); ud}B#{6
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if((l-i)>THRESHOLD){ ]z{f)`;I
stack[++top]=i; ImnN&[Cu
stack[++top]=l-1; IC[iCrB
} f:)%+)U<Xm
if((j-l)>THRESHOLD){ h9J%NH
stack[++top]=l+1; t^Hte^#S
stack[++top]=j; V/; / &
} nm3/-Q},
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} n@"h^-
//new InsertSort().sort(data); ?~g X7{>
insertSort(data); 'i5V6yB
} #4Z]/D2G
/** Wdp?<U
* @param data qDzd_E@aR
*/ W\W|v?r
private void insertSort(int[] data) { B)1.CHV%<
int temp; ag~4m5n*~
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); bF#1'W&
} M:* ^k
} ;K+'J0
} vxmz3ht,Q
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} 5qx,b&^w
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