归并排序: = mnjIp
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package org.rut.util.algorithm.support; eiLtZQ
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import org.rut.util.algorithm.SortUtil; hl4@Y#n
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/** Sr7+DCr
* @author treeroot !*46@sb:
* @since 2006-2-2 DNgQ.lV
* @version 1.0 wp/u*g
*/ 4fDo }~
public class MergeSort implements SortUtil.Sort{ id^U%4J
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/* (non-Javadoc) L_+0[A
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) uj.~/W1,!
*/ )g4oUZDF
public void sort(int[] data) { IBwquw+
int[] temp=new int[data.length]; 47Y|1
mergeSort(data,temp,0,data.length-1); Q37VhScs
} (wJtEoB9^
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private void mergeSort(int[] data,int[] temp,int l,int r){ E(G=~>P
int mid=(l+r)/2; kndP?#>
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if(l==r) return ; nG#lrYZw
mergeSort(data,temp,l,mid); ?e|'I"
mergeSort(data,temp,mid+1,r); rT`D@
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for(int i=l;i<=r;i++){ v}6YbY Tq
temp=data; #Id.MLHxA_
} 1SBc:!2
int i1=l; ':,6s
int i2=mid+1; )k&pp^q\
for(int cur=l;cur<=r;cur++){ ujcS>XN,1
if(i1==mid+1) fgxsC7P$
data[cur]=temp[i2++]; c$f|a$$b
else if(i2>r) ixJUq o
data[cur]=temp[i1++]; lY}mrb
else if(temp[i1] data[cur]=temp[i1++]; ;F&wGe
else kO<`RHlX=
data[cur]=temp[i2++]; m RCgKW<
} ~A0E4UJgq
} UT[9ERS
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改进后的归并排序: K{VF_S:
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package org.rut.util.algorithm.support; =erA.u
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import org.rut.util.algorithm.SortUtil; ;>=hQC{f>
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/** TGLkwXOkT
* @author treeroot oWyg/{M
* @since 2006-2-2 [BhpfZNKRA
* @version 1.0 S&-sl
*/ sF;1)7]Pq
public class ImprovedMergeSort implements SortUtil.Sort { +N[dYm
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private static final int THRESHOLD = 10; ?xf59mY7
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/* yZ:|wxVY
* (non-Javadoc) cFLu+4.jsG
* Cu({%Gy+
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^JtGT
*/ >Z^7=5K"O
public void sort(int[] data) { c: *wev
int[] temp=new int[data.length]; >ge-yK 1
mergeSort(data,temp,0,data.length-1); 7>{edNy!,
} #},]`"n\
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private void mergeSort(int[] data, int[] temp, int l, int r) { pmCBe6n\l
int i, j, k; i/xPO
int mid = (l + r) / 2; HqgTu`
if (l == r) :kZ2N67
return; p!'wOThO`
if ((mid - l) >= THRESHOLD) Vm8;{S q
mergeSort(data, temp, l, mid); ]_BG"IR!..
else "EpE!jh
insertSort(data, l, mid - l + 1); y<F$@
if ((r - mid) > THRESHOLD) `Uk,5F5
mergeSort(data, temp, mid + 1, r); sSG]I%oB3
else hl~(&D1^
insertSort(data, mid + 1, r - mid); ;$i9gP[|m
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for (i = l; i <= mid; i++) { S=aXmz<
temp = data; ~Y)Au?d(a
} 3:Co K#
for (j = 1; j <= r - mid; j++) { D .Cm&
temp[r - j + 1] = data[j + mid]; P[P!WLr""
} j<deTK;.
int a = temp[l]; b&~uK"O'7d
int b = temp[r]; %o4d43uZ
for (i = l, j = r, k = l; k <= r; k++) { C`mXEX5
if (a < b) { Tf@t.4\
data[k] = temp[i++]; Q\=u2}/z0
a = temp; D~f.)kkC4
} else { .M>u:,v
data[k] = temp[j--]; ">fgoDQ
b = temp[j]; #<'/sqL
} N83RsL "}_
} N#.IpY'7Ze
} `ss]\46>
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/** s*9tWSd
* @param data <i`EP/x
* @param l bf;IJ|v^
* @param i 4kXx(FE
*/ 1Y9Ye?~jd
private void insertSort(int[] data, int start, int len) { >Dtw^1i
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); zm8m J2s
} %aw/Y5
} r~s03g0
} 6C]!>i}U
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}