归并排序: &BCl>^wn}
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package org.rut.util.algorithm.support; 28LjQ!
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import org.rut.util.algorithm.SortUtil; (5;w^E9*n;
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/** p-y,OG
* @author treeroot nod?v2%
* @since 2006-2-2 jUZ84Gm{
* @version 1.0 _*9eAeJ
*/ XJC|6"n
public class MergeSort implements SortUtil.Sort{ %IW=[D6Tg
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/* (non-Javadoc) wvcG <sj
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ; @-7'%(C
*/ !V$m!i;
public void sort(int[] data) { PE|_V
int[] temp=new int[data.length]; -2w\8]u
mergeSort(data,temp,0,data.length-1); 4rc4}Yu,JI
} STL_#|[RM
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private void mergeSort(int[] data,int[] temp,int l,int r){
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int mid=(l+r)/2; i(2s"Uww,
if(l==r) return ; tqAh&TW3+
mergeSort(data,temp,l,mid); O]~ cv^
mergeSort(data,temp,mid+1,r); uYhm
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for(int i=l;i<=r;i++){ 6^s=25>p
temp=data; ^|Of
} .4Jea#M&x
int i1=l; cc*A/lD
int i2=mid+1; YbND2i
for(int cur=l;cur<=r;cur++){ S
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if(i1==mid+1) BYyR-m
data[cur]=temp[i2++]; s}uOht}
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else if(i2>r) PR|F-/o
data[cur]=temp[i1++]; PP.QfY4
else if(temp[i1] data[cur]=temp[i1++]; QnME|j\
else ow!utAF
data[cur]=temp[i2++]; 6x^#|;e>lI
} (g`G(K_
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改进后的归并排序: >u
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package org.rut.util.algorithm.support; WId"2W3M
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import org.rut.util.algorithm.SortUtil; ARGtWW~:
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/** f',n'
* @author treeroot T@GT=1E)
* @since 2006-2-2 J cL4q\g
* @version 1.0 :3pJGMv(
*/
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public class ImprovedMergeSort implements SortUtil.Sort { {Iy<iV
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private static final int THRESHOLD = 10; c
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/* NGcd
* (non-Javadoc) SU~t7Ta!G
* P$ZIKkf
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) !K-lO{Z^
*/ wmAZ {
public void sort(int[] data) { fb3(9
int[] temp=new int[data.length]; 4{=zO(>
mergeSort(data,temp,0,data.length-1); l\xcR]O
} hOw
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private void mergeSort(int[] data, int[] temp, int l, int r) { Q1yMI8
int i, j, k; AE?MEag
int mid = (l + r) / 2; @E;'Ffo
if (l == r) XP'<\
return; OJ^kESrm8
if ((mid - l) >= THRESHOLD) K4~z@.
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mergeSort(data, temp, l, mid); .<%2ON_
else ^aYlu0Wm
insertSort(data, l, mid - l + 1); kH/u]+_
if ((r - mid) > THRESHOLD) W/DSj :
mergeSort(data, temp, mid + 1, r); Y"6
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else 3eT5~Lbs
insertSort(data, mid + 1, r - mid); `2-6Qv
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for (i = l; i <= mid; i++) { ^YG'p?r.s
temp = data; (k/[/`3ST
} `Sgj!/!F
for (j = 1; j <= r - mid; j++) { "Zm**h.t
temp[r - j + 1] = data[j + mid]; & mwQj<Z
} zGzeu)d
int a = temp[l]; N^</:R
int b = temp[r]; < %@e<,8
for (i = l, j = r, k = l; k <= r; k++) { HHVCw7r0
if (a < b) { VBnD:w"z
data[k] = temp[i++]; (#I$4Px{
a = temp; KmS$CFsGL
} else { [rk*4b ^s
data[k] = temp[j--]; 8_byS<b8
b = temp[j]; 9<0TF+}>
} e.-+zkQ8EI
} cjK\(b3
} O&BNhuW2
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/** cHo@F!{o=
* @param data @uA=v/>+
* @param l O?\UPNb:K
* @param i #J=^CE
*/ v~E\u
private void insertSort(int[] data, int start, int len) { eb1WTK@
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ?.Iau/
} QA|87alh
} Qp>'V<%m-
} 1i=lJmr
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}