归并排序: W&(k!6<x
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package org.rut.util.algorithm.support; $$b
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import org.rut.util.algorithm.SortUtil; -=s(l.?Hm5
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/** tCxF~L@
* @author treeroot Z6\+
* @since 2006-2-2 m,C1J%{^
* @version 1.0 lif&@of
*/ FR2=
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public class MergeSort implements SortUtil.Sort{ WE]e
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/* (non-Javadoc) akw,P$i
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3rLTF\
*/ HbP!KVHyk1
public void sort(int[] data) { s,#>m*Rh
int[] temp=new int[data.length]; )i+2X5B`S
mergeSort(data,temp,0,data.length-1); `qJw|u>YpJ
} !EUan
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private void mergeSort(int[] data,int[] temp,int l,int r){ W>-Et7&2
int mid=(l+r)/2; w 4[{2
if(l==r) return ; oh#\]c\f
mergeSort(data,temp,l,mid); 8-<:i
mergeSort(data,temp,mid+1,r); "-@[R
for(int i=l;i<=r;i++){ 4_Dp+^JF
temp=data; ()&~@1U
} ^B8b%'\
int i1=l; CLvX!O(~
int i2=mid+1; {uzf"%VtP
for(int cur=l;cur<=r;cur++){ r.7$&BCng
if(i1==mid+1) )95f*wte
data[cur]=temp[i2++]; `+6R0Ch
else if(i2>r) W9NX=gE4
data[cur]=temp[i1++]; lHgs;>U$
else if(temp[i1] data[cur]=temp[i1++]; rE@T79"
else =zQN[
data[cur]=temp[i2++]; \&U>LwZd?
} Ft}@1w5
} 9tF9T\jW
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改进后的归并排序: n:MdYA5,m
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package org.rut.util.algorithm.support; /Q,mJ.CnSR
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import org.rut.util.algorithm.SortUtil; Sa2>`":d
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/** pz"0J_xDM
* @author treeroot bygx]RC[
* @since 2006-2-2 <&C]sb
* @version 1.0 pK0"%eA
*/ *6q5S4 r
public class ImprovedMergeSort implements SortUtil.Sort { E>l~-PaZY
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private static final int THRESHOLD = 10; oJN#C%r7
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/* v:H$<~)E|
* (non-Javadoc) |i++0BU
* Ub6jxib
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 0_ 88V
*/ T=ev[ mS
public void sort(int[] data) { x7O-Y~[2
int[] temp=new int[data.length]; 2}8v(%s p
mergeSort(data,temp,0,data.length-1); |\pbir
} #U14-^7
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private void mergeSort(int[] data, int[] temp, int l, int r) {
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int i, j, k; ` V##Y
int mid = (l + r) / 2; K6R.@BMN
if (l == r) 41&\mx
return; p,#o<W
if ((mid - l) >= THRESHOLD) ob8qe,_'
mergeSort(data, temp, l, mid); 4:FK;~wM&x
else ;+ "+3
insertSort(data, l, mid - l + 1); \ Yx/(e
if ((r - mid) > THRESHOLD) %7|9sQ:
mergeSort(data, temp, mid + 1, r); `nu''B
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else Ofs<EQ
insertSort(data, mid + 1, r - mid); $< JaLS
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for (i = l; i <= mid; i++) { 4r45i:
temp = data; A}l3cP;
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} dkz=CY3p%X
for (j = 1; j <= r - mid; j++) { q.;u?,|E/
temp[r - j + 1] = data[j + mid]; CB^U6ZS
} @{25xTt
int a = temp[l]; JD|=>)
int b = temp[r]; u A<n
for (i = l, j = r, k = l; k <= r; k++) { ff^=Ruf$
if (a < b) {
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data[k] = temp[i++]; }~L.qG
a = temp; {tWf
} else { qi^7
data[k] = temp[j--]; ')cMiX\v
b = temp[j]; > ;*b|Ik
} y+NN< EY@
} `x*Pof!Io
} [TmIVQ!B
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/** ln6d<;
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* @param data g%=z_
* @param l iUN Ib
* @param i DW[N|-L
*/ Vh4X%b$TV
private void insertSort(int[] data, int start, int len) { BI%$c~wS
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); <