归并排序: x }i'2
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package org.rut.util.algorithm.support; N >k,"=N/
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import org.rut.util.algorithm.SortUtil; T1M>N
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/** 9&Ny;oy#6
* @author treeroot AME<V-5
* @since 2006-2-2 T;#:Y
* @version 1.0 FB
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*/ #Ti5G"C
public class MergeSort implements SortUtil.Sort{ eb7~\|9l1i
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/* (non-Javadoc) `q+Ug
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 'J: xTp
*/ ?<~P)aVVj
public void sort(int[] data) { wj9Hh
int[] temp=new int[data.length]; `g'z6~c7n
mergeSort(data,temp,0,data.length-1); [Y8ot-6
} m`#UV-$J
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private void mergeSort(int[] data,int[] temp,int l,int r){ VV"1I R
int mid=(l+r)/2; !CLL{\F
if(l==r) return ; Y 016Xg5
mergeSort(data,temp,l,mid); p1fy)K2{,j
mergeSort(data,temp,mid+1,r); X -_0wR
for(int i=l;i<=r;i++){ lQ| i
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temp=data; yD(v_J*
} e@L?jBj8m
int i1=l; `W{y
int i2=mid+1; 6mC% zXR5
for(int cur=l;cur<=r;cur++){ P|;=dX#-
if(i1==mid+1) !KLY*bt6
data[cur]=temp[i2++]; `:5W1D(
else if(i2>r) &u0on)E
data[cur]=temp[i1++]; s3oQ( wC %
else if(temp[i1] data[cur]=temp[i1++]; g/OL^A
else *
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data[cur]=temp[i2++]; yYvv!w+@Q
} PZhpp"
} bf$4Z: Y
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} zwdi$rM5
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改进后的归并排序: \ O+Hmi^
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package org.rut.util.algorithm.support; OB\jq!"
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import org.rut.util.algorithm.SortUtil; HKYJgx
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/** U\UlQp?
* @author treeroot YHI@Cj
* @since 2006-2-2 pLsJa?}R
* @version 1.0 @H|3e@5([
*/ #<gD@Jyb u
public class ImprovedMergeSort implements SortUtil.Sort { nHIW_+<Mf
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private static final int THRESHOLD = 10; v9l|MI15V
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/* jfsbvak
* (non-Javadoc) ,Cj` 0v#
* R;F z"J
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) )r6d3-p1
*/ );*#s~R
public void sort(int[] data) { P: )YKro]
int[] temp=new int[data.length]; 3L-}B#tI
mergeSort(data,temp,0,data.length-1); P{o //M
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private void mergeSort(int[] data, int[] temp, int l, int r) { /PgcW
int i, j, k; gshgl3
int mid = (l + r) / 2; T|ZJ$E0
if (l == r) o7t#yw3
return; }XIUz|
if ((mid - l) >= THRESHOLD) ^3w
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mergeSort(data, temp, l, mid); |f<-lB[k
else HbQ+:B]
insertSort(data, l, mid - l + 1); #~:@H&f790
if ((r - mid) > THRESHOLD) o :_'R5
mergeSort(data, temp, mid + 1, r);
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else SMbhJ}\O
insertSort(data, mid + 1, r - mid); y<*/\]t9L[
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for (i = l; i <= mid; i++) { c_)lTI4
temp = data; w$z]Z-
} L(\o66a-rV
for (j = 1; j <= r - mid; j++) { KPB^>,T2{
temp[r - j + 1] = data[j + mid]; )L%[(iI,x
} -aF\
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int a = temp[l]; E:S (v
int b = temp[r]; 3NxwQ,~
for (i = l, j = r, k = l; k <= r; k++) { &l2C-(
if (a < b) { !;COFR
data[k] = temp[i++]; 6@cT;=W;xj
a = temp; ul[+vpH9
} else { \EOPlyf8x
data[k] = temp[j--]; 7W `gN[*
b = temp[j]; t+m
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} ahqsbNu1
} m{C
} XonI
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/** !%Qm{R
* @param data _S;Fs|p_
* @param l Fun+L@:;
* @param i M3/_E7Qoj
*/ sU 5/c|&
private void insertSort(int[] data, int start, int len) { Qlgii_?#@
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); dsD!)$
} o@blvW<v7
} ecG,[1];
} `]3A#y)v
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}