归并排序: z8(R.TB
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package org.rut.util.algorithm.support; ]jVSsSv
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import org.rut.util.algorithm.SortUtil; zrU$SWU
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/** 4@]xn
* @author treeroot #* gU[9U~
* @since 2006-2-2 {vT55i<mk
* @version 1.0 abaQJ|
*/ DV[ Jbl:)
public class MergeSort implements SortUtil.Sort{ {QS@Ugf
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/* (non-Javadoc) 5Ue^>8-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) vvsNWA
*/ 6G<Hi"I
public void sort(int[] data) { Cre0e$ a
int[] temp=new int[data.length]; mU+FQX
mergeSort(data,temp,0,data.length-1); nn)`eR&
} tM$0 >E
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private void mergeSort(int[] data,int[] temp,int l,int r){ 6l\UNG7
int mid=(l+r)/2; lDJd#U'V
if(l==r) return ; a^XTW7]r
mergeSort(data,temp,l,mid); ;Co[y=Z
mergeSort(data,temp,mid+1,r); [ lzy &To
for(int i=l;i<=r;i++){ (: TGe v
temp=data; sMfFm@\ N
} K"k"ml<4E
int i1=l; ]PzTl {]
int i2=mid+1; y/}VtD
for(int cur=l;cur<=r;cur++){ c_z/At;4
if(i1==mid+1) L_gsG|xX
data[cur]=temp[i2++]; ?]\W8)
else if(i2>r) < k+fKl
data[cur]=temp[i1++]; e.}3OK
else if(temp[i1] data[cur]=temp[i1++]; LD~Jbq
else RC8)f8n
data[cur]=temp[i2++]; ^KZAYB9C
} *)NR$9lGv
} B)DC,+@$
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改进后的归并排序: V"7<[u]K|
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package org.rut.util.algorithm.support; 7zg)h
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import org.rut.util.algorithm.SortUtil; {wpMg
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/** -[f"r`
* @author treeroot sw$R2K{y
* @since 2006-2-2 !k:zLjtp
* @version 1.0 @vdc)vN[/
*/ UL)"
public class ImprovedMergeSort implements SortUtil.Sort { b
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private static final int THRESHOLD = 10; V<HOSB7
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/* T3G/v)ufd
* (non-Javadoc) j$|j8?
* 5y(t`Fmt
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) d(X\B{
*/ F8uRT&m B0
public void sort(int[] data) { [>$\s=` h
int[] temp=new int[data.length]; . QQ?w
mergeSort(data,temp,0,data.length-1); y /X:=d6"
} -t%{"y
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private void mergeSort(int[] data, int[] temp, int l, int r) { BP[CR1Gs
int i, j, k; +Mk*{A t
int mid = (l + r) / 2; @Z9>3'2]A
if (l == r) PG^j}
return; &?/N}g@K
if ((mid - l) >= THRESHOLD) 3yHb!}F
mergeSort(data, temp, l, mid); ,#E3,bu6_4
else :$M9XZ~\
insertSort(data, l, mid - l + 1); T.Pklty
if ((r - mid) > THRESHOLD) L9{mYA]q
mergeSort(data, temp, mid + 1, r); ;L
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else p|h.@do4
insertSort(data, mid + 1, r - mid); GhG%>U#&a
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for (i = l; i <= mid; i++) { BaWQ<T8p8
temp = data; [!J
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} Q?
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for (j = 1; j <= r - mid; j++) { ?qf:_G
temp[r - j + 1] = data[j + mid]; u [V4OU}%
} fqcU5l[v,
int a = temp[l]; !paN`Fz\a
int b = temp[r]; .N5hV3
for (i = l, j = r, k = l; k <= r; k++) { s6uF5]M;2
if (a < b) { uQ[vgNe*m
data[k] = temp[i++]; ,zAK3d&hj
a = temp; bU;}!iVc]
} else { .)iO Du
data[k] = temp[j--]; +=ZWau
b = temp[j]; aW0u8Dz
} -Q<z1vz
} t(J![wB}
} 0Y5LDP
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/** *F\T}k7
* @param data .mvB99P{<
* @param l x[vpoB+c
* @param i g(-;_j!=
*/ IvEMg2f}
private void insertSort(int[] data, int start, int len) { 2YL`3cgfb
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Q3'fz 9v
} 0hrCG3k.91
} H!u nIy|
} M|/oFV
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}