归并排序: X9/]<Y<!
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package org.rut.util.algorithm.support; PDtLJt$
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import org.rut.util.algorithm.SortUtil; bZ_vb? n
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/** VFjNrngl
* @author treeroot ZZ@1l
* @since 2006-2-2 L"ob))GF
* @version 1.0 &HIG776
*/ GK\`8xWE
public class MergeSort implements SortUtil.Sort{ J6W"t
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/* (non-Javadoc) ^7$V>|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) sH`(y)`_
*/ XX;MoE~MM
public void sort(int[] data) { XTPf~Te,=
int[] temp=new int[data.length]; 2nA/{W\ hC
mergeSort(data,temp,0,data.length-1); kNDN<L
} -eSZpz p
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private void mergeSort(int[] data,int[] temp,int l,int r){ ';.n#
int mid=(l+r)/2; iqh"sx{5bp
if(l==r) return ; z*BGaSX %
mergeSort(data,temp,l,mid); pG0Ca](
mergeSort(data,temp,mid+1,r); "j] r
for(int i=l;i<=r;i++){ O0cKmh6=
temp=data; t)h{ w"v
} )EptyH
int i1=l; cO^}A(Ma(
int i2=mid+1; 2pn8PQfg)
for(int cur=l;cur<=r;cur++){ vivU4:uH3
if(i1==mid+1) ;"j>k>tg
data[cur]=temp[i2++]; _7qGo7bpN
else if(i2>r) DP<[Uz&
data[cur]=temp[i1++]; ts=KAdcJ
else if(temp[i1] data[cur]=temp[i1++]; A57e]2_
else DC6xet{
data[cur]=temp[i2++]; >p,FAz>
} f )K(la^'
} wrmbO T
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} oNK-^N?-T
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改进后的归并排序: "E/UNE6P4
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package org.rut.util.algorithm.support; .Bb86Y=3
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import org.rut.util.algorithm.SortUtil; u{dI[?@
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/** B9(e"cMm
* @author treeroot .6xIg+
* @since 2006-2-2 6Lhfb\2?
* @version 1.0 cc_v 4d{x
*/ p?qW;1
public class ImprovedMergeSort implements SortUtil.Sort { 3Sclr/t
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private static final int THRESHOLD = 10; jUg.Y98
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/* u/g4s (a
* (non-Javadoc) }8,[B50
* |E=8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) TU(w>v
*/ LA%t'n h
public void sort(int[] data) { i<uWLhgh1$
int[] temp=new int[data.length]; iD-,C`
mergeSort(data,temp,0,data.length-1); z=/xv},
} '<eeCe-
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private void mergeSort(int[] data, int[] temp, int l, int r) { L4?)N&V
int i, j, k; C^W9=OH
int mid = (l + r) / 2; lX*IEAc
if (l == r) ,OilGTQ#
return;
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if ((mid - l) >= THRESHOLD) pk5W!K
mergeSort(data, temp, l, mid); M);@XcS
else U6M3,"?
insertSort(data, l, mid - l + 1); ~+r"%KnG
if ((r - mid) > THRESHOLD) zJ7=r#b
mergeSort(data, temp, mid + 1, r); k,UezuV
else dX8N7{"[
insertSort(data, mid + 1, r - mid); ]pi8%.d
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for (i = l; i <= mid; i++) { 5oP31
temp = data; :2_8.+:
} yw3E$~ k
for (j = 1; j <= r - mid; j++) { }jWZqIqj
temp[r - j + 1] = data[j + mid]; S85}&\m&4
} Ebk_(Py\
int a = temp[l]; 5l
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int b = temp[r]; P.Uz[_&l6
for (i = l, j = r, k = l; k <= r; k++) { gk.c"$2
if (a < b) { j9XRC9
data[k] = temp[i++]; aO'lk
a = temp; JE$aYs<(TF
} else { 9=wt9` ?
data[k] = temp[j--]; j4hiMI;
b = temp[j]; ~=xS\@UY =
} ?!$uMKyt
} >lg-j-pV
} O?I~XM'S
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/** TtZ
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* @param data bw\a\/Dw
* @param l eJv_`#R&Of
* @param i Q\ AM]
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*/ Spt]<~
private void insertSort(int[] data, int start, int len) { =5QP'Qt{O
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 6JYVC>i
} w?LDaSz\t
} Np?%pB!Q
} 6)B6c. 5o
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}