归并排序: Bv2z4D4f+
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package org.rut.util.algorithm.support; @`w'
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import org.rut.util.algorithm.SortUtil; -s9 Y(>
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/** =nJOaXR0
* @author treeroot g2+l@$W
* @since 2006-2-2 XD;15a
* @version 1.0 :*mA,2s
*/ 0t5Q9#RY
public class MergeSort implements SortUtil.Sort{ s,1pZT <E
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/* (non-Javadoc) k)N2 +/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <bEN8b
*/ n%83jep9
public void sort(int[] data) { E\{^0vNc
int[] temp=new int[data.length]; xDPQG`6
mergeSort(data,temp,0,data.length-1); wm); aWP
} s,eld@
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private void mergeSort(int[] data,int[] temp,int l,int r){ =?meO0]y
int mid=(l+r)/2; j#*asGdp#J
if(l==r) return ; MILIu;[{#r
mergeSort(data,temp,l,mid); z5x,fQw6O
mergeSort(data,temp,mid+1,r); X@6zI-Y%
for(int i=l;i<=r;i++){ X% Spv/8{
temp=data; S/@dkHI'
} B'G*y2UnG
int i1=l; /2g)Z!&+L
int i2=mid+1; %k/
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for(int cur=l;cur<=r;cur++){ iYO
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if(i1==mid+1) 5en
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data[cur]=temp[i2++]; L eG7x7n
else if(i2>r) r[.zLXgK
data[cur]=temp[i1++]; ^ 4u3Q
else if(temp[i1] data[cur]=temp[i1++]; m&Y;/kr
else 8CHb~m@^$
data[cur]=temp[i2++]; B(4:_j\2
} Z]mM
} /E`l:&89)
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} Nw9-pQ
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改进后的归并排序: 6Nfof
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package org.rut.util.algorithm.support; w5dIk]T
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import org.rut.util.algorithm.SortUtil; cCo07R
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/** Gt\K Ln
* @author treeroot /RA1d<~$q
* @since 2006-2-2 '8r8
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* @version 1.0 XEf&Yd
*/ 5XSxQG@k^z
public class ImprovedMergeSort implements SortUtil.Sort { ^D W#
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private static final int THRESHOLD = 10; bqg]DO$*
;
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/* r85Xa'hh
* (non-Javadoc) G+#| )V
* F:*[
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <FUqD0sQ
*/ |xsV(jK8
public void sort(int[] data) { Y{Y;EY4
int[] temp=new int[data.length]; ps!5HZ2:
mergeSort(data,temp,0,data.length-1); U:mq7Rd8
} PBxK>a
v @$evmA
private void mergeSort(int[] data, int[] temp, int l, int r) { 'f=) pc#&g
int i, j, k; Ckl7rpY+
int mid = (l + r) / 2; jm#d7@~4
if (l == r) _SBp66
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return; H0D>A<Ue
if ((mid - l) >= THRESHOLD) SQ~N X)
mergeSort(data, temp, l, mid); a`EGx{q(
else :|n>H+Y
insertSort(data, l, mid - l + 1); g:.,}L
if ((r - mid) > THRESHOLD) *O(/UVuD\
mergeSort(data, temp, mid + 1, r); j,|1y5f
else p0[,$$pM
insertSort(data, mid + 1, r - mid); |"Xi%CQ2
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for (i = l; i <= mid; i++) { .WL\:{G8;
temp = data; =BqaGXr
} 0_,3/EWa
for (j = 1; j <= r - mid; j++) { X YNUss
temp[r - j + 1] = data[j + mid]; \pewbu5^
} #FQm/Q<0
int a = temp[l]; dVsAX(
int b = temp[r]; 4,w{rmj
for (i = l, j = r, k = l; k <= r; k++) { 0TuOY%+
if (a < b) { ctc`^#q
data[k] = temp[i++]; Z!*8JaMT
a = temp; JGSk4
} else { u'$yYzBE
data[k] = temp[j--]; m]-v IUpb
b = temp[j]; A/$KA'jX
} A1k&`
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} PNxVW
} 0XQ".:+h
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/** zgq_0w~X
* @param data MUCJ/GF*
* @param l v'
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* @param i wQdW
lon
*/ !ulLGmUn
private void insertSort(int[] data, int start, int len) { U>L=.\\|
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Zeme`/aBb
} PBAz`y2
} YL9t3]
} k[r./xEv+t
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}