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快速排序: Sf, z
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package org.rut.util.algorithm.support; |q77
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import org.rut.util.algorithm.SortUtil; ~ 1h#
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/** yXR1NYg
* @author treeroot >S +}
* @since 2006-2-2 4!Js="
* @version 1.0 %hnBpz
*/ r<+C,h;aww
public class QuickSort implements SortUtil.Sort{ k5S;G"iJ
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/* (non-Javadoc) wGArR7r
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) LlQsc{Ddf
*/ 6L<:>55
public void sort(int[] data) { 3^o(\=-JX
quickSort(data,0,data.length-1); k6Kc{kY
} fc9;ZX7
private void quickSort(int[] data,int i,int j){ Ap
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int pivotIndex=(i+j)/2; R{#< NE
//swap l$;"yVdks
SortUtil.swap(data,pivotIndex,j); 9* )&hhBs,
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int k=partition(data,i-1,j,data[j]); c|Ivet>3
SortUtil.swap(data,k,j); nj[TTndJt
if((k-i)>1) quickSort(data,i,k-1); `>:5[Y
if((j-k)>1) quickSort(data,k+1,j); ;}46Uc#WS
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} b' o]Y
/** +lym8n~-O
* @param data QJ2]8K)+C
* @param i i
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* @param j 3B&A)&pEO
* @return Xul`>8y|
*/ x%B_v^^^
private int partition(int[] data, int l, int r,int pivot) { ?Z#N9Z~\
do{ O sgPNy0
while(data[++l] while((r!=0)&&data[--r]>pivot); !Z!)$3bB
SortUtil.swap(data,l,r); *d1BpR%
} kt6x"'"1
while(l SortUtil.swap(data,l,r); rQjk
return l; ]at$ohS
} (g##wa)L
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改进后的快速排序: ')uYI;h9
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package org.rut.util.algorithm.support; U zy@\
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import org.rut.util.algorithm.SortUtil; ;,4*uU'vq
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/** MpCPY"WLL
* @author treeroot nQF&^1n
* @since 2006-2-2 Qd}n4KF\
* @version 1.0 @Kpm&vd(
*/ ;vH2r~
public class ImprovedQuickSort implements SortUtil.Sort { 0]DOiA
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private static int MAX_STACK_SIZE=4096; kuEXNi1l
private static int THRESHOLD=10; `a83RX_\
/* (non-Javadoc) n2U
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %F*9D3^h
*/ dAI^ P/y%
public void sort(int[] data) { e+[*4)Qfy
int[] stack=new int[MAX_STACK_SIZE]; Xoe|]@U`
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int top=-1; VE|:k:};
int pivot; ^h[6{F~J
int pivotIndex,l,r; 1WUSp;JMl
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stack[++top]=0; BlVHP8/b
stack[++top]=data.length-1; o=m5AUe?J
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while(top>0){ {?qfH>oFA
int j=stack[top--]; }a]`"_i;[
int i=stack[top--];
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pivotIndex=(i+j)/2; x93@[B*%
pivot=data[pivotIndex]; !nmZ"n|}p
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SortUtil.swap(data,pivotIndex,j); >^Nnhnr
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//partition -)V0D,r$[
l=i-1; BZeEZ2"
r=j; pzF_g-B
do{ o|xf2k
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 2I.FSR_G?
SortUtil.swap(data,l,r); y1V}c,
} PR{ubMn
while(l SortUtil.swap(data,l,r); d^v#x[1msZ
SortUtil.swap(data,l,j); )UR$VL
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if((l-i)>THRESHOLD){ mb\T)rj
stack[++top]=i; 1c$pz:$vX
stack[++top]=l-1; 1iT_mtXK$
} TegdB|y7O
if((j-l)>THRESHOLD){ Jf^3nBZ
stack[++top]=l+1; )."ob=m
stack[++top]=j; 1$*8F
} MK#
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} W~ yb>+u
//new InsertSort().sort(data); Gs:g
insertSort(data); 1 iH@vd
}
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/** Tuvs}
* @param data *DJsY/9d}'
*/ WIWo4[(
private void insertSort(int[] data) { b_+o1Zy`
int temp; 0|GYt nd
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); _/>ktYo:
} "aGmv9\
} rZUTBLZ`j
} (kL"*y/"p
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} x?i
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