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快速排序: _qWliw:0#
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package org.rut.util.algorithm.support; j.:h5Y^N
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import org.rut.util.algorithm.SortUtil; D\ H/
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/** AE@NOM7u
* @author treeroot "Y=+Ls(3o(
* @since 2006-2-2 >5
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* @version 1.0 5IKL#V`3a
*/ 5#E |R
public class QuickSort implements SortUtil.Sort{ wJlX4cT4YV
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/* (non-Javadoc) m~'? /!!
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) D.%B$Y;G
*/ Y[SU&LM
public void sort(int[] data) { |/ }\6L]
quickSort(data,0,data.length-1); y3<Y?M4
} 1h7+@#<:a
private void quickSort(int[] data,int i,int j){ ]/cd;u
int pivotIndex=(i+j)/2; vOgC>_x7
//swap *x>3xQq&
SortUtil.swap(data,pivotIndex,j); auWXgkwZs/
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int k=partition(data,i-1,j,data[j]); _u}4j 9T
SortUtil.swap(data,k,j); Yif*"oO
if((k-i)>1) quickSort(data,i,k-1); :h,`8 Di
if((j-k)>1) quickSort(data,k+1,j); ^JR;epVJ
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} J`*iZvW#Bx
/** Q# ?wXX47
* @param data _#_
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* @param i ~LQ[4h<J !
* @param j ;
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* @return ~np,_yI
*/ nNmsr=y5
private int partition(int[] data, int l, int r,int pivot) { =IKEb#R/
do{ oK9'
while(data[++l] while((r!=0)&&data[--r]>pivot); 3^=+gsc
SortUtil.swap(data,l,r); jKIc09H|
} 4Tct
while(l SortUtil.swap(data,l,r); V|MY!uV
return l; OJ4SbI
} Wn|&cG9
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} smQVWs>
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改进后的快速排序: {I{:GcS
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package org.rut.util.algorithm.support; {0YAzZ7
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import org.rut.util.algorithm.SortUtil; Brd,Eg
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/** VK3it3FI>3
* @author treeroot o5aLUWi-
* @since 2006-2-2 c3
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* @version 1.0 ;pRcVL_4
*/ T{vR,
public class ImprovedQuickSort implements SortUtil.Sort { iwY'4Z
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private static int MAX_STACK_SIZE=4096; y 0ckm6^
private static int THRESHOLD=10; P|jF6?C
/* (non-Javadoc) =GR'V
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Dmdy=&G
*/ 8n?kZY$,
public void sort(int[] data) { 9j|gdfb%ml
int[] stack=new int[MAX_STACK_SIZE]; %zo=
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int top=-1; G.U5)4_^
int pivot; 4-v6=gz.
int pivotIndex,l,r; 5 ZfP
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stack[++top]=0; ?PPZp6A3L=
stack[++top]=data.length-1; v@EQ^C2.&
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while(top>0){ bb=uF1
int j=stack[top--]; F#+ .>!
int i=stack[top--]; X21dX`eMN
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pivotIndex=(i+j)/2; ~y0R'oi
pivot=data[pivotIndex]; uL?vG6% ^1
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SortUtil.swap(data,pivotIndex,j); d @rs3Q1z
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//partition UU@fkk
l=i-1; 8}BB OD
r=j; PoD^`()FR{
do{ '=cKU0
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); `EMi0hm&H
SortUtil.swap(data,l,r); *i<\iMoW
} S-Ai3)t6
while(l SortUtil.swap(data,l,r); I+,SZ]n
SortUtil.swap(data,l,j); $EBb"+Y'T
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if((l-i)>THRESHOLD){ So4nJ><p
stack[++top]=i; s'_,:R\VM>
stack[++top]=l-1; m s~8QL
} )fh0&Y; R
if((j-l)>THRESHOLD){ et$uP
stack[++top]=l+1; qSiWnN8D
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stack[++top]=j; H}b\`N[nr
} N?23 m`3
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} z \?UGxu}
//new InsertSort().sort(data); t%+$"nP
insertSort(data); G?V"SU.
} QD<eQsvV
/** jQtSwVDr
* @param data :%tuNJjj
*/ F,v7ifo#f
private void insertSort(int[] data) { OV5e#AOy)
int temp; ESDB[
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); :):zNn_>`
} VO`"<
} bsO@2NP'
} 8sw,k
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} l
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