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快速排序: [(@K;6o
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package org.rut.util.algorithm.support; > O?WRCB
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import org.rut.util.algorithm.SortUtil; w\acgQ^%e
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/** q13fmK(n-5
* @author treeroot ksC_F8Q+
* @since 2006-2-2 _ l|%~
* @version 1.0 xT"V9t[f
*/ @v%Kw e1Q
public class QuickSort implements SortUtil.Sort{ bI &<L O
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/* (non-Javadoc) d5l42^Z
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6^gp
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*/ h p|v?3(
public void sort(int[] data) { p[C"K0>:_F
quickSort(data,0,data.length-1); Cjf[]aNJe`
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private void quickSort(int[] data,int i,int j){ oh8:1E,I
int pivotIndex=(i+j)/2; m`-);y
//swap pq{`WgA^
SortUtil.swap(data,pivotIndex,j); #SHeK 4
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int k=partition(data,i-1,j,data[j]); Z6zV 9hn
SortUtil.swap(data,k,j); :cC$1zv@
if((k-i)>1) quickSort(data,i,k-1); WiytHuUF
if((j-k)>1) quickSort(data,k+1,j); 0 #8
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} j+_fHADq
/** ~(V\.hq
* @param data
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* @param i )$n%4 :
* @param j 5*$yY-A
* @return ~</FF'Xz
*/ 6j(/uF4!#
private int partition(int[] data, int l, int r,int pivot) { Dx-P]j)4x
do{ ">bhxXeiN
while(data[++l] while((r!=0)&&data[--r]>pivot); yl-:9|LT
SortUtil.swap(data,l,r); >$ZG=&
} 3s%?)z
while(l SortUtil.swap(data,l,r); }Z"iW/?"
return l; &zJI~R
} [7@g*!+d
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} &!8 WRJ
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改进后的快速排序: 8zx]/>
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package org.rut.util.algorithm.support; dVb6u
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import org.rut.util.algorithm.SortUtil; gs'M^|e)
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/** <<>+z5D+
* @author treeroot 1b9S";ct0
* @since 2006-2-2 _@ao$)q{J
* @version 1.0 .C^P6S2oJ
*/ qi,) l*?f
public class ImprovedQuickSort implements SortUtil.Sort { G WIsT\J
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private static int MAX_STACK_SIZE=4096; rwq
private static int THRESHOLD=10; K3!3[dR*
/* (non-Javadoc) c<$<n
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Ms!EK
*/ TWRP|i!i
public void sort(int[] data) { sq'm)g
int[] stack=new int[MAX_STACK_SIZE]; &O'W+4FAc
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int top=-1; M/<ypJ
int pivot; & &}_[{fc
int pivotIndex,l,r; ['mpxtG
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stack[++top]=0; W[&nQW$E
stack[++top]=data.length-1; '##?PQ*u
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while(top>0){ Zy(i_B-b
int j=stack[top--]; (K[{X0T
int i=stack[top--]; gnp.!-
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pivotIndex=(i+j)/2; /!H24[tnk1
pivot=data[pivotIndex]; qf0pi&q
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SortUtil.swap(data,pivotIndex,j); [\ao#f0WR
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//partition .\XRkr'-
l=i-1; d7V/#34
r=j; QEJu.o
do{ `LkrG9KV{
while(data[++l] while((r!=0)&&(data[--r]>pivot)); E'WXi!>7p
SortUtil.swap(data,l,r); CF;Gy L1M
} mE<_oRM)
while(l SortUtil.swap(data,l,r); |ty&}'6C
SortUtil.swap(data,l,j); .V;,6Vq
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if((l-i)>THRESHOLD){ +
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stack[++top]=i; M XG>|
stack[++top]=l-1; Km5_P##
} 85E$m'0O
if((j-l)>THRESHOLD){ _A,_RM$Y
stack[++top]=l+1; XC3)#D#HGh
stack[++top]=j; c^W;p2^
} $1 ])>m_ct
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} ?T/4
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//new InsertSort().sort(data); dy6zrgxygP
insertSort(data); <f7 O3 >
} n{QyqI
/** ci;2XLAM
* @param data ROkwjw
*/ ?xaUWD
private void insertSort(int[] data) { ?A@y4<8R|
int temp; (XOz_K6c%K
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ]G[ "TX,
} m'2F#{
} sPK ]:iC
} xsZN@hT
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} a#1r'z~]}
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