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快速排序: EnAw8Gm*
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package org.rut.util.algorithm.support; TUCpmj
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import org.rut.util.algorithm.SortUtil; 2(x KE_|
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/** 0{uX2h
* @author treeroot 8zv6Mx
* @since 2006-2-2 wYM{x!D
* @version 1.0 p
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*/ :36^^Wm
public class QuickSort implements SortUtil.Sort{ <o`]wOrl
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/* (non-Javadoc) !I$RE?7eY
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Sv",E@!f
*/ At:C4>HE@
public void sort(int[] data) { x=+H@YO\
quickSort(data,0,data.length-1); !9Ni[8&Fg0
} @1X1E 2:
private void quickSort(int[] data,int i,int j){ [#H8Mb+7
int pivotIndex=(i+j)/2; D]y.!D{l2
//swap 9a,CiH%@
SortUtil.swap(data,pivotIndex,j); VUhu"h@w%
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int k=partition(data,i-1,j,data[j]); C*zdHzMj
SortUtil.swap(data,k,j); s_Gp +-
if((k-i)>1) quickSort(data,i,k-1); 6YbSzx`?k
if((j-k)>1) quickSort(data,k+1,j); I>|?B(F
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} 81C?U5
/** ]C^*C|
* @param data yIP
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* @param i 6FAP *V;
* @param j /zAx`H
* @return \|s/_35(
*/ :a`m9s 4
private int partition(int[] data, int l, int r,int pivot) { HRh".!lxy
do{ o$;x[US
while(data[++l] while((r!=0)&&data[--r]>pivot); 6jA Q
SortUtil.swap(data,l,r); 4Yk(ldR~
} OC.@C}u
while(l SortUtil.swap(data,l,r); M1\/ueOe
return l; cQb%bmBc5
} 3Q;l*xu
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} Dbd5d]]n3
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改进后的快速排序: |&.)_+w
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package org.rut.util.algorithm.support; m5*RB1
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import org.rut.util.algorithm.SortUtil; L"0L_G
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/** '-_PO|}
* @author treeroot ,y @3'~
* @since 2006-2-2 eA_4,"{
* @version 1.0 4v7RX
*/ =X B)sC%
public class ImprovedQuickSort implements SortUtil.Sort { ce\-oT
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private static int MAX_STACK_SIZE=4096; 4)z](e$
private static int THRESHOLD=10; Q2uE_w`B
/* (non-Javadoc) V2X(f6v
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) oB@C-(M
*/ C_/oORvK
public void sort(int[] data) { a6OT2B
int[] stack=new int[MAX_STACK_SIZE]; A
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int top=-1; QO%K`}Q}
int pivot; ~gD'up@$/
int pivotIndex,l,r; -mF9Skj
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stack[++top]=0; &3efJ?8
stack[++top]=data.length-1; 7Fx8&Z
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while(top>0){ r` @Dgo}
int j=stack[top--]; 2I
int i=stack[top--]; ' wEP:}
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pivotIndex=(i+j)/2; wl4yNC
pivot=data[pivotIndex]; S/|8'x{<
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SortUtil.swap(data,pivotIndex,j); A
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//partition SF7Kb `>Y
l=i-1; 622).N4
r=j; @{G(.S
do{ l;ugrAo?
while(data[++l] while((r!=0)&&(data[--r]>pivot)); *SZ<ori
SortUtil.swap(data,l,r); 0NGokaD)H
} U+z&jdnhDR
while(l SortUtil.swap(data,l,r); C*$/J\6xy
SortUtil.swap(data,l,j); hI
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if((l-i)>THRESHOLD){ 1,E/So
stack[++top]=i; x8^Dhpr6
stack[++top]=l-1; 9bB~r[k
} &}oDSD
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if((j-l)>THRESHOLD){ sgX~4W"J
stack[++top]=l+1; K(?7E6\vO
stack[++top]=j; 20qT1!ju
} /i<g>*82
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} 2WoB ;=
//new InsertSort().sort(data); '"&?u8u)
insertSort(data); A8?>V%b[Y
}
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/** F{[Q
* @param data @AwH?7(b
*/ |7 argk+
private void insertSort(int[] data) { j'W)Nyw$[
int temp; _>*"6
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); KLk37IY2\
} JGtdbD?Fw
} 'oTF$3n
} ? DPL7
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} ^l9S5
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