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快速排序: #b`ke/P
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package org.rut.util.algorithm.support; P%zK;#8V
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import org.rut.util.algorithm.SortUtil; :Sma`U&
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/** f<H2-(m
* @author treeroot HV.t6@\};
* @since 2006-2-2 4z? l
* @version 1.0 nK,w]{<wG!
*/ 3u;oQ5<(v
public class QuickSort implements SortUtil.Sort{ ys~x$
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/* (non-Javadoc) putrSSL}
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
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*/ / +\9S
public void sort(int[] data) { TN.rrop`#g
quickSort(data,0,data.length-1); ] @'!lhLi
} E3i4=!Y
private void quickSort(int[] data,int i,int j){ dscgj5b1~
int pivotIndex=(i+j)/2; . ^u,.
//swap ;]iRk
SortUtil.swap(data,pivotIndex,j); yZRzIb_
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int k=partition(data,i-1,j,data[j]); RpK@?[4s
SortUtil.swap(data,k,j); G"6 !{4g
if((k-i)>1) quickSort(data,i,k-1); zTp"AuNHN
if((j-k)>1) quickSort(data,k+1,j); n ;Ei\\p!
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} <[phnU^
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/** <[v[ci
* @param data nu^436MSOa
* @param i a}d@
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* @param j _&x%^&{
* @return GeqPRah
*/ O8o3O
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private int partition(int[] data, int l, int r,int pivot) { Bwrx *J
do{ TseGXYH
while(data[++l] while((r!=0)&&data[--r]>pivot); =-T]3!
SortUtil.swap(data,l,r); j+!v}*I![
} h 0|s
while(l SortUtil.swap(data,l,r); N;R^h? '
return l; ZC?Xqp
} ,I9bNO,%JK
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} 7,MR*TO,
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改进后的快速排序: +_`7G^U?%
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package org.rut.util.algorithm.support; K@2),(z
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import org.rut.util.algorithm.SortUtil; NRuNKl.v
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/** ~~.}ah/_d
* @author treeroot So6x"1B
* @since 2006-2-2 <%^&2UMg
* @version 1.0 fJ\[*5eiS
*/ rjP/l6
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public class ImprovedQuickSort implements SortUtil.Sort { SJLis"8
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private static int MAX_STACK_SIZE=4096; QPx^_jA
private static int THRESHOLD=10; =D(j)<9$A
/* (non-Javadoc) RFGffA&
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 54,er$$V
*/ ~Ei<Z`3}7"
public void sort(int[] data) { YUb_y^B^
int[] stack=new int[MAX_STACK_SIZE]; Y2TtY;
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int top=-1; Sdo-nt
int pivot; sKWfXCd
int pivotIndex,l,r; \['Cj*e k
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stack[++top]=0; ~u{uZ(~
stack[++top]=data.length-1; Qrv<lE1V;
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while(top>0){ e.> P8C<&
int j=stack[top--]; 4*L_)z&4;
int i=stack[top--]; 7$b1<.WX
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pivotIndex=(i+j)/2; >?b!QU*a
pivot=data[pivotIndex]; 7pd$\$
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SortUtil.swap(data,pivotIndex,j); HQ g^
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//partition dM5-;
l=i-1; sB</DS
r=j; ig!+2g
do{ :h$$J
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); yevPHN"M
SortUtil.swap(data,l,r); *|0 -~u%q
} .8R@2c`}Cs
while(l SortUtil.swap(data,l,r); NUZl`fu1Z4
SortUtil.swap(data,l,j); M{@(G5
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if((l-i)>THRESHOLD){ =&]L00u.
stack[++top]=i; M7T5
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stack[++top]=l-1; )UR7i8]!0
} x4 yR8n(
if((j-l)>THRESHOLD){ ?}0 ,o.
stack[++top]=l+1; tc! #wd+u
stack[++top]=j;
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} `Oa
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} NOva'qk
//new InsertSort().sort(data); $I=~S[p
insertSort(data); ]/Pn
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} [~HN<>L@C
/** <YY 14p
* @param data Ytkv!]"
*/ J zl6eo[;
private void insertSort(int[] data) { ]DcFySyv
int temp; EwN}l
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); s_Sk0}e
} t0S1QC+
} AH^/V}9H
} A"]YM'.
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} 7I}uZ/N
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