归并排序: O:E0htdWr
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package org.rut.util.algorithm.support; YY zUg
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import org.rut.util.algorithm.SortUtil; }]#&U/z
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/** 9\'JtZO
* @author treeroot `' .;U=mF
* @since 2006-2-2 HVd y!J
* @version 1.0 fZ aTckbE
*/ _lG|t6y
public class MergeSort implements SortUtil.Sort{ gU&y5s~
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/* (non-Javadoc) ]z#+3DaH
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ]-j.\+(*
*/ oBO4a^D
public void sort(int[] data) { 9r.h^
int[] temp=new int[data.length]; 'aWqj+Wbh
mergeSort(data,temp,0,data.length-1); **V8a-@
} n!dXjInV
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private void mergeSort(int[] data,int[] temp,int l,int r){ ;9CbioO
int mid=(l+r)/2; a,|Hn
if(l==r) return ; {j6$'v)0
mergeSort(data,temp,l,mid); 3Ofh#|qc&
mergeSort(data,temp,mid+1,r); bey:Qj??
for(int i=l;i<=r;i++){ %*zV&H
temp=data; jn4|gQ
} "4IrW6B$9
int i1=l; W:maE9E=
int i2=mid+1; ^sKdN-{
for(int cur=l;cur<=r;cur++){ AQ&vq$
if(i1==mid+1) `# U<'$
data[cur]=temp[i2++]; "XQ3mi`y
else if(i2>r) KpBOmXE
data[cur]=temp[i1++]; 5e3p9K`5
else if(temp[i1] data[cur]=temp[i1++]; gvFJ~lL
else S{m:Iij[;
data[cur]=temp[i2++]; /3#h]5Y"T
} wz..
} %4wEAi$I
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改进后的归并排序: gR+P!Eow
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package org.rut.util.algorithm.support; 4_D
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import org.rut.util.algorithm.SortUtil; {,!!jeOO
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/** #<~oR5ddlb
* @author treeroot *>/w,E]
* @since 2006-2-2 Lv?jg?$
* @version 1.0 H u9nJ
*/ <0VC`+p<)
public class ImprovedMergeSort implements SortUtil.Sort { xw}rFY$
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private static final int THRESHOLD = 10; +DG-MM%\
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/* %+nM4)h
* (non-Javadoc) M]|]b-#
* Y<IuwS
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Ee_?aG
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*/ a@Vk(3Rx_
public void sort(int[] data) { vz(=3C[
int[] temp=new int[data.length]; g(auB/0s
mergeSort(data,temp,0,data.length-1); sSf;j,7V
} 9OFH6-;6`\
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private void mergeSort(int[] data, int[] temp, int l, int r) { %K+hG=3O
int i, j, k; CIui9XNU
int mid = (l + r) / 2; u -)ED
if (l == r) QLU <%w:B
return; *s#6e}
if ((mid - l) >= THRESHOLD) mz Cd@<T,
mergeSort(data, temp, l, mid); ,Ne9x\F
else (t){o>l
insertSort(data, l, mid - l + 1); # >I_
if ((r - mid) > THRESHOLD) ]c v/dY#
mergeSort(data, temp, mid + 1, r); nrA 4N1
else T+x
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insertSort(data, mid + 1, r - mid);
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for (i = l; i <= mid; i++) { BL~#-Mm<|l
temp = data; f[vm]1#
} TQ:h[6v
for (j = 1; j <= r - mid; j++) { 0i"2s}^+_
temp[r - j + 1] = data[j + mid]; {\`y)k 7
} VFM!K$_
int a = temp[l]; |Eh2#K0x4G
int b = temp[r]; CzY18-L@EX
for (i = l, j = r, k = l; k <= r; k++) {
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if (a < b) { }z#M!~
data[k] = temp[i++]; Q>$lf.)
a = temp; 1ni72iz\
} else { ur E7ZKdI
data[k] = temp[j--]; n&o"RE 0~0
b = temp[j]; KgbBa2@+
} :Tv>)N
} R:(i}g<3
} .N>*+U>>P
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/** oOc-1C
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* @param data dl3;A_ 2
* @param l $&qLrKJ
* @param i
* ]
*/ j'Jb+@W?
private void insertSort(int[] data, int start, int len) { ZXL'R|?
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); gG@4MXq.
} ?w!8;xS8
} ~NPhVlT
} kN3 <l7
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}