归并排序: &V2G<gm0
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package org.rut.util.algorithm.support; h{TnvI/"
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import org.rut.util.algorithm.SortUtil; 9(B)
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/** v=W%|iZ
* @author treeroot lL83LhE}<
* @since 2006-2-2 Rdv"Aj:
* @version 1.0 @yek6E&9
*/ P089Mh9
public class MergeSort implements SortUtil.Sort{ 5
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/* (non-Javadoc) /_56H?w\
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %R_8`4IQ
*/ H?B.Hp|
public void sort(int[] data) { M.l;!U!}
int[] temp=new int[data.length]; FEP\5d>
mergeSort(data,temp,0,data.length-1); "5YsBih
} 4mPg; n
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private void mergeSort(int[] data,int[] temp,int l,int r){ MQ,2v.
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int mid=(l+r)/2; kPxrI=
if(l==r) return ; "fmJ;W;#1
mergeSort(data,temp,l,mid); O=+C Kx@
mergeSort(data,temp,mid+1,r); ]9x30UXLwD
for(int i=l;i<=r;i++){ qI'a|p4fn?
temp=data; !}vz_6)
} QR,i
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int i1=l;
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int i2=mid+1; RZz] .Nx
for(int cur=l;cur<=r;cur++){ ?Dfgyz
if(i1==mid+1) S ":-5S6
data[cur]=temp[i2++]; #6YNgJNk
else if(i2>r) >o[T#U
data[cur]=temp[i1++]; $B(B
else if(temp[i1] data[cur]=temp[i1++]; _x>u"w
else 7aU*7!U
data[cur]=temp[i2++]; 9:esj{X
} M`5^v0,C
} k r/[|.bq
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} SWmdU]
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改进后的归并排序: ?^6RFbke+
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package org.rut.util.algorithm.support; LOOv8'%O8
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import org.rut.util.algorithm.SortUtil; {X<tUco
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/** %f>V\z_C
* @author treeroot XBDlQe|>
* @since 2006-2-2 6x.#K9@q4
* @version 1.0 #2`tsZ]=I
*/ MbJV)*Q
public class ImprovedMergeSort implements SortUtil.Sort { %f^TZ,q$
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private static final int THRESHOLD = 10; *W0`+#Dcv
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/* UZdpKi@
* (non-Javadoc) 8ayB<b>+]"
* _E?(cWC
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Z3Viil:
*/ V862(y
public void sort(int[] data) { 6 .*=1P*?
int[] temp=new int[data.length]; udw5A*Ls
mergeSort(data,temp,0,data.length-1); H 7R1GaJ
} 9oN b= .
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private void mergeSort(int[] data, int[] temp, int l, int r) { 4sG^bZ,
int i, j, k; 7?F0~[eGG
int mid = (l + r) / 2; Hm*n,8_
if (l == r) =b6Q2s,i
return; B!9<c9/ P]
if ((mid - l) >= THRESHOLD) *}LYMrP
mergeSort(data, temp, l, mid); o^lKM?t
else /#.6IV(
insertSort(data, l, mid - l + 1); F9Mv$g79
if ((r - mid) > THRESHOLD) xeZ,}YP)
mergeSort(data, temp, mid + 1, r); P=eL24j
else Xd{"+'29
insertSort(data, mid + 1, r - mid); }yXa1#3
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for (i = l; i <= mid; i++) { #IgY'L
temp = data; a2sN$k
} s% I)+|
for (j = 1; j <= r - mid; j++) { nIdvff
temp[r - j + 1] = data[j + mid]; s,lrw~17
} qd(`~a
int a = temp[l]; J6=*F;x6E
int b = temp[r]; !m:SRNPg
for (i = l, j = r, k = l; k <= r; k++) { \z0"
if (a < b) { Z^s&]
data[k] = temp[i++]; )ASI41
a = temp; # M%-q8
} else { eSJ5YeY)
data[k] = temp[j--]; P>Pw;[b>O
b = temp[j]; L%I@HB9-Q0
} "Q-TLN5(
} 3/oVl
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} T =_Hd
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/** 6[w_/X"
* @param data ?/5WM%
* @param l m.Yj{u8zX
* @param i IL*C/y
*/ Z!v)zH\
private void insertSort(int[] data, int start, int len) { Z;-=x p
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); e@w-4G(;
} bw&8"k>D?
} /X; [
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} Fzt{^%\`
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}