归并排序: !UoA6C:
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package org.rut.util.algorithm.support; EVPQe-
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import org.rut.util.algorithm.SortUtil; B7f<XBU6>
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/** g#$ C8k
* @author treeroot oP,*H6)i
* @since 2006-2-2 ozRO:*51
* @version 1.0 =ANr|d
*/
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public class MergeSort implements SortUtil.Sort{ @;4;72@O
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/* (non-Javadoc) 7p1Y g
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^77W#{ Zs
*/ VEgtN}
public void sort(int[] data) { ,8 4|qI
int[] temp=new int[data.length]; n[jXqFm!`
mergeSort(data,temp,0,data.length-1); "u6pl);G
} e4z~
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private void mergeSort(int[] data,int[] temp,int l,int r){ ,iyy2
int mid=(l+r)/2; RhowhQ) G
if(l==r) return ; Fe!MA
mergeSort(data,temp,l,mid); d'';0[W)
mergeSort(data,temp,mid+1,r); 64u(X^i
for(int i=l;i<=r;i++){ pbx*Y`v
temp=data; !/p|~K
} ZO%^r%~s
int i1=l; TQ(q[:>
int i2=mid+1; dEk#"cvg
for(int cur=l;cur<=r;cur++){ {]dxFhe)
if(i1==mid+1) DSLX/uo1
data[cur]=temp[i2++]; sOLh'x f.
else if(i2>r) rnK]3Ust
data[cur]=temp[i1++]; ??/bI~Sd
else if(temp[i1] data[cur]=temp[i1++]; l!,tssQ
else (u 7Lh>6%
data[cur]=temp[i2++]; ]'pfw9"f~
} dUv@u!}B
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改进后的归并排序: Nw. )O
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package org.rut.util.algorithm.support; |5vJ:'` I
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import org.rut.util.algorithm.SortUtil; WHC/'kvF
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/** h{)m}"n<R
* @author treeroot E{V?[HcWq
* @since 2006-2-2 Cj>HMB}
* @version 1.0 oZ2:%
*/ M5VW1Ns
public class ImprovedMergeSort implements SortUtil.Sort { __}SHU0R
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private static final int THRESHOLD = 10; +k6`
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/* M
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* (non-Javadoc) W<q<}RSn
* 807+|Ol[
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) B*G]Dr)e
*/
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public void sort(int[] data) { X8tPn_`x
int[] temp=new int[data.length]; ;.jj>1=Tnl
mergeSort(data,temp,0,data.length-1); ZW?h\0Hh
} vL _yM
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private void mergeSort(int[] data, int[] temp, int l, int r) { <Ch9"1f3,
int i, j, k; 2}<tzDI'
int mid = (l + r) / 2; \L>XF'o
if (l == r) ,xU#uyB
return; .+>fD0fW7Y
if ((mid - l) >= THRESHOLD) Gw)y<h
mergeSort(data, temp, l, mid); i@:^b_
else ;8#6da,
insertSort(data, l, mid - l + 1); 3F,M{'q
if ((r - mid) > THRESHOLD) Jm ,:6T
mergeSort(data, temp, mid + 1, r); Y1lUO[F j
else $/^Y(0
insertSort(data, mid + 1, r - mid); Vw;iE=L
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for (i = l; i <= mid; i++) { kQU4s)J
temp = data; g Nz
} JAHmmNlW
for (j = 1; j <= r - mid; j++) { pej-W/R&
temp[r - j + 1] = data[j + mid]; >c@! EPS
} ecm+33C
int a = temp[l]; e|C2/U-
int b = temp[r]; )Fd)YJVR
for (i = l, j = r, k = l; k <= r; k++) { jA8Bmwt;w
if (a < b) { 3^Is4H_8
data[k] = temp[i++]; lLVD`)
a = temp; .+2:~%v6
} else { w*'DlP<7
data[k] = temp[j--]; &T-:`(
b = temp[j]; 5<X"+`=9
} =WN8><K!
} YeJTB}
} qKXg'1#E)
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/** NjS<DzKhK
* @param data Bph(\=
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* @param l *#p}FB2H#
* @param i %>nAPO+e
*/ `0s3to%7
private void insertSort(int[] data, int start, int len) { %eF=;q
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 0dx%b677d
} v7j/_;JE;
} Z>`frL
} 0(5qVJ12
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}