归并排序: *RugVH4
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package org.rut.util.algorithm.support; '\qd{mM\r
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import org.rut.util.algorithm.SortUtil; c , a+u
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/** G}1?lO_d`
* @author treeroot hA1\+r
* @since 2006-2-2 {2<A\nW
* @version 1.0 @!z9.o;
*/ M`!\$D
public class MergeSort implements SortUtil.Sort{ x&qC~F*QR%
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/* (non-Javadoc) rYUhGmg`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^:g8mt
*/ tFLdBv!=:^
public void sort(int[] data) { %/KN-*
int[] temp=new int[data.length]; <Z%iP{
mergeSort(data,temp,0,data.length-1); MxMrLiqU6l
} / sI0{
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private void mergeSort(int[] data,int[] temp,int l,int r){ 2_@vSwC
int mid=(l+r)/2; !e?;f=1+E
if(l==r) return ; 8&FnXhZg4
mergeSort(data,temp,l,mid); "Ka2jw,
mergeSort(data,temp,mid+1,r); Qhlgu!
for(int i=l;i<=r;i++){
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temp=data; MQc|j'vEY
} fpbb <Ro
int i1=l; '"C$E922
int i2=mid+1; 2Qg.b-C
for(int cur=l;cur<=r;cur++){ Vy-N3L
if(i1==mid+1) ['%]tWT9
data[cur]=temp[i2++]; LX{[9
else if(i2>r) X2b<_j3
data[cur]=temp[i1++]; A<ca9g3
else if(temp[i1] data[cur]=temp[i1++]; 6.? Ke8iC
else Dohq@+] O
data[cur]=temp[i2++]; 8
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} 8z&7wO
} H\]ZtSw8-
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} 4qq+7B
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改进后的归并排序: FG.MV-G
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package org.rut.util.algorithm.support; 2_lgy?OE`
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import org.rut.util.algorithm.SortUtil; J@RhbsZn
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/** P/;sZo
* @author treeroot :wiQ^ea
* @since 2006-2-2 zbsdK
* @version 1.0 7{HJjH!zx
*/ y.6D Z
public class ImprovedMergeSort implements SortUtil.Sort { Q]WjW'Ry\
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private static final int THRESHOLD = 10; o33wePx,
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/* ER0nrTlB<
* (non-Javadoc) +92/0
* v%O KOrJ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *nUD6(@g
*/ sE87}Lz
public void sort(int[] data) { 39| W(,
int[] temp=new int[data.length]; ,!U._ic'B
mergeSort(data,temp,0,data.length-1); pyA;%vJn
} ^`ah\L
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private void mergeSort(int[] data, int[] temp, int l, int r) { *Dx&} "
int i, j, k; b#;%TbDF
int mid = (l + r) / 2; ` #Qlr+X
if (l == r) ^_FB .y%
return; cVjs-Xf7D%
if ((mid - l) >= THRESHOLD) FncK#hZ.
mergeSort(data, temp, l, mid); M0[7>N_
else |sd0fTK
insertSort(data, l, mid - l + 1); 94bmKV_
if ((r - mid) > THRESHOLD) 4/Ub%t-
mergeSort(data, temp, mid + 1, r); -a:+ h\K
else SV%;w>
insertSort(data, mid + 1, r - mid);
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for (i = l; i <= mid; i++) { \9Nd"E[B
temp = data; $'D|}=h<Y
} &DoYz[q
for (j = 1; j <= r - mid; j++) { !{'C.sb?~
temp[r - j + 1] = data[j + mid]; c#'t][Ii
} G'b*.\=
int a = temp[l]; }F3}-5![
int b = temp[r]; MVdX
for (i = l, j = r, k = l; k <= r; k++) { ?wzE+p-
if (a < b) { OwXw9
data[k] = temp[i++]; ``*iK
a = temp; S<do.{|p[
} else { 1<y(8C6
data[k] = temp[j--]; Ne7HPSWiOP
b = temp[j]; ^IgxzGD
} A1Tk6i<F1
} Fc{M
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} UI S\t^pJD
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/** VJW%y)_[
* @param data ug]WIG7 S
* @param l ]%AmX-U
* @param i A")F7F31c
*/ t[HfaW1W
private void insertSort(int[] data, int start, int len) { jK`b6:#(,
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Z$qLY<aV
} xUT]6T0dB
} )l 0\TF
} N l~'W
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}