归并排序: ?dyt!>C
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package org.rut.util.algorithm.support; >H,5MM!
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import org.rut.util.algorithm.SortUtil; }F';"ybrU)
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/** =X;h _GQ
* @author treeroot m2\[L/W]
* @since 2006-2-2 Vz]yJ:
* @version 1.0 (XNd]G
*/ (5l'?7
public class MergeSort implements SortUtil.Sort{ '[vCC'
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/* (non-Javadoc) =bOMtQ]
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 13p.dp`
*/ cz1 m05E
public void sort(int[] data) { P#9Pq,I
int[] temp=new int[data.length]; ~^J9v+
mergeSort(data,temp,0,data.length-1); 8I7JsCj
} 2<E@f0BVAy
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private void mergeSort(int[] data,int[] temp,int l,int r){ tkP& =$
int mid=(l+r)/2; pD]2.O
if(l==r) return ; )S9}uOG#
mergeSort(data,temp,l,mid); `4,]Mr1b
mergeSort(data,temp,mid+1,r); mYFc53B
for(int i=l;i<=r;i++){ $wcTUl
temp=data; ;o?o92d
} ui80}%
int i1=l; p{x6BVw?>
int i2=mid+1; Gce[RB:
for(int cur=l;cur<=r;cur++){ -XfGF<}r
if(i1==mid+1) F8xu&Vk0:
data[cur]=temp[i2++]; e8&7W3 m
else if(i2>r) a5/r|BiBK
data[cur]=temp[i1++]; (_R!:H(]m
else if(temp[i1] data[cur]=temp[i1++]; w19OOD
else w>4( hGO
data[cur]=temp[i2++]; Q2'`K|T
} /jSb^1\
} ~m4LL[
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} {S`Rr/E|%
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改进后的归并排序: kyf(V)APPu
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package org.rut.util.algorithm.support; y*E{X
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import org.rut.util.algorithm.SortUtil; 44pVZ5c
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/** ,xutI
* @author treeroot L7"<a2J
* @since 2006-2-2 C'PHbo:
* @version 1.0 lNMJcl3
*/ s$~H{za
public class ImprovedMergeSort implements SortUtil.Sort { `)NTJc$):
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private static final int THRESHOLD = 10; TA+#{q+a
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/* f\;f&GI
* (non-Javadoc) v}<z_i5/C.
* y\:,.cZ+TQ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) p7L6~IN
*/ Jw^h<z/Ux
public void sort(int[] data) { Pk5 %lu
int[] temp=new int[data.length]; y!x-R!3
mergeSort(data,temp,0,data.length-1); ]d*O>Pm
} E O "
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private void mergeSort(int[] data, int[] temp, int l, int r) { Uv(}x7e)
int i, j, k; }Qh%Z)
int mid = (l + r) / 2; knzQ)iv&&
if (l == r) ]''tuo2g8
return; D>kkA|>
if ((mid - l) >= THRESHOLD) UMH~Q`"
mergeSort(data, temp, l, mid); tPDB'S:&3
else )>]SJQ!k
insertSort(data, l, mid - l + 1); @h5 Q?I
if ((r - mid) > THRESHOLD) m|[cEZxHB
mergeSort(data, temp, mid + 1, r); PPh1y;D
else !q8A!P4|'
insertSort(data, mid + 1, r - mid); kdMB.~(K=
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for (i = l; i <= mid; i++) { !v*#E{r"g=
temp = data; Is97>aid
} UJ`%uLR~
for (j = 1; j <= r - mid; j++) { sA
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temp[r - j + 1] = data[j + mid]; V /)3d
} /x/W>J2
int a = temp[l]; hysxHOL
int b = temp[r]; 6wb M$|yFj
for (i = l, j = r, k = l; k <= r; k++) { nTsPX Tat
if (a < b) { 3]>YBbXvE
data[k] = temp[i++]; nZ`=Up p)
a = temp; z.W1Za
} else { 7KtgR=-Lb
data[k] = temp[j--]; !9^GkFR6n
b = temp[j]; /sVmQqVY
} K,*If Hi6[
} QzYaxNGv
} JV!}"[
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/** ik0w\*
* @param data ^1ks`1
* @param l eoPoGC
* @param i mW)"~sA
*/ C|rl",&
private void insertSort(int[] data, int start, int len) { 'YEiT#+/
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); e co=ia
} !Tu.A@
} l`];CALA4
} !p)cP"fa
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}