归并排序: a&4>xZU #
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package org.rut.util.algorithm.support; ow%s_yV]R
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import org.rut.util.algorithm.SortUtil; zgqe@;{
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/** t~Ds)
* @author treeroot D",ZrwyJ
* @since 2006-2-2 J'Gn M?M
* @version 1.0 ka*VQXk*
*/ Up)b;wR
public class MergeSort implements SortUtil.Sort{ nA5v+d-<T
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/* (non-Javadoc) d v"
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) |L<oKMZY
*/ lOcvRF
public void sort(int[] data) { /dBQ*f5
int[] temp=new int[data.length]; V#C[I~l
mergeSort(data,temp,0,data.length-1); i%v^Zg&FU
} R&=Y7MfZ
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private void mergeSort(int[] data,int[] temp,int l,int r){ N2xgyKy~
int mid=(l+r)/2; 7@|(z:uw
if(l==r) return ; ATH0n>)
mergeSort(data,temp,l,mid); cfa#a!Y4
mergeSort(data,temp,mid+1,r); k
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for(int i=l;i<=r;i++){ 9:4P7
temp=data; x1?p+
} ?Tt/,Hl?D
int i1=l; 2t/ba3Rfk
int i2=mid+1; xlv:+
for(int cur=l;cur<=r;cur++){ Z'PL?;&+R
if(i1==mid+1) lg;`I tX]
data[cur]=temp[i2++]; (Q\QZu@
else if(i2>r) Y Q3%vH5#y
data[cur]=temp[i1++]; HFvhrG
else if(temp[i1] data[cur]=temp[i1++]; nEyPNm)
else D("['`{
data[cur]=temp[i2++]; FHqa|4Ie
} enK4`+.7
} pA"pt~6
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} ,5H$Tm,6\S
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改进后的归并排序: FL"I PX;S
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package org.rut.util.algorithm.support; PBR+NHrZ
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import org.rut.util.algorithm.SortUtil; h$4V5V
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/** VqbMFr<k
* @author treeroot 9F ).i
* @since 2006-2-2 j?3J-}XC
* @version 1.0 ?^5W.`Y2i
*/ 9O~1o?ni
public class ImprovedMergeSort implements SortUtil.Sort { D?8t'3no
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private static final int THRESHOLD = 10; %[&cy'
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/* ^~eT#Y8
* (non-Javadoc) ;(TBg-LEK
* GVCyVt[!-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) l?Bv9k.^?
*/ 3eFD[c%mN
public void sort(int[] data) { :G$NQ*(z
int[] temp=new int[data.length]; l{_>?]S5
mergeSort(data,temp,0,data.length-1); g}L2\i688
} ;{j:5+'
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private void mergeSort(int[] data, int[] temp, int l, int r) { !A&Vg #
int i, j, k; O/iew3YF
int mid = (l + r) / 2; Xj?j1R>GB
if (l == r) DM~Q+C=Yr
return; nNq| v=L
if ((mid - l) >= THRESHOLD) E!C~*l]wJx
mergeSort(data, temp, l, mid); q yQPR
else =HYMX"s
insertSort(data, l, mid - l + 1); ,t(y~Z
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if ((r - mid) > THRESHOLD) rS{Rzs^@
mergeSort(data, temp, mid + 1, r); nRb#M
else 6pxj9@X+
insertSort(data, mid + 1, r - mid); 64hr|v
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for (i = l; i <= mid; i++) { 2p(K0PtX
temp = data; *.n9D
} T->O5t c
for (j = 1; j <= r - mid; j++) { Y&]pC
temp[r - j + 1] = data[j + mid]; AbcmI*y
} ,Es5PmV@$%
int a = temp[l]; 2pxl!
int b = temp[r]; /vwGSuk._
for (i = l, j = r, k = l; k <= r; k++) { }NiJDs
if (a < b) { OfbM]:}<3
data[k] = temp[i++]; u
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a = temp; f*bs{H'5
} else { 2Q-kD?PO,
data[k] = temp[j--]; `+k&]z$m
b = temp[j]; \CX`PZ><
} adHHnH`,
} _+.z2} M
} b?h"a<7
r6*0H/*
/** {SCwi;m
* @param data D{PO!WzW
* @param l u` R
* @param i _lu.@IX-
*/ 8&3+=<U
private void insertSort(int[] data, int start, int len) { CIYTs,u#
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); kplyZ
} +8mfq\Y1
} |!flR? OU
} .lOEQLt
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}