归并排序: RGh`=D/yE
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package org.rut.util.algorithm.support; s,>1n0a
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import org.rut.util.algorithm.SortUtil; &g;4;)p*8
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/** ;hU56lfZ)X
* @author treeroot 9v&{;
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* @since 2006-2-2 4L\bT;dQ|.
* @version 1.0 $$`E@\5P
*/ i2`i5&*
public class MergeSort implements SortUtil.Sort{ "mr;|$Y
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/* (non-Javadoc) 9NLO{kN
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) {FyGh
*/
*/ ](c[D9I!8
public void sort(int[] data) { SOQm>\U'i
int[] temp=new int[data.length]; 8 St`,Tq)
mergeSort(data,temp,0,data.length-1); +Z[(s!
} /~*U'.V
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private void mergeSort(int[] data,int[] temp,int l,int r){ P[-2^1P"
int mid=(l+r)/2; 5\/h3i"I
if(l==r) return ; rSDS9Vf(
mergeSort(data,temp,l,mid); c-8Pc]+g
mergeSort(data,temp,mid+1,r); !m(5N4:vV
for(int i=l;i<=r;i++){ z17
temp=data; UqRm\h
} +*-u_L\'
int i1=l; O{hGh{y
int i2=mid+1; "P;_-i9O
for(int cur=l;cur<=r;cur++){ KIO{6
if(i1==mid+1) -:wC920+
data[cur]=temp[i2++]; P<yd
else if(i2>r) \:ntqj&A|
data[cur]=temp[i1++]; }TD$!
else if(temp[i1] data[cur]=temp[i1++]; *X_CtjgF
else 8_WFSF^
data[cur]=temp[i2++]; 4h wUH
} n|
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} OV ~|@{6T
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} @(2DfrC
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改进后的归并排序: 13(JW
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package org.rut.util.algorithm.support; oyV@BHJO@
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import org.rut.util.algorithm.SortUtil; 44axOk!G[/
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/** b?`8-g
* @author treeroot z1A[rbe=4w
* @since 2006-2-2 _uU}J5d.
* @version 1.0 ~3 4Ly
*/ ]5b%r;_
public class ImprovedMergeSort implements SortUtil.Sort { %IG cn48J
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private static final int THRESHOLD = 10; biFy*+|
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/* j2NnDz'
* (non-Javadoc) Zn&S7a>7
* I8
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) l%@>)%LA
*/ 51 3{oM:
public void sort(int[] data) { g@]G
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int[] temp=new int[data.length]; +4U ?*:n
mergeSort(data,temp,0,data.length-1); T.nY>Q8
} FaO1?.
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private void mergeSort(int[] data, int[] temp, int l, int r) { |,rIB
int i, j, k; 7@"J&><w!
int mid = (l + r) / 2; pcIJija:
if (l == r) v~i/e+.h>y
return; ~ldqg2c
if ((mid - l) >= THRESHOLD) ek6PMZF:'
mergeSort(data, temp, l, mid); 8*yhx
else _:F0>=$
insertSort(data, l, mid - l + 1); Nq
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if ((r - mid) > THRESHOLD) dX|(n.}
mergeSort(data, temp, mid + 1, r); \5.36Se
else 3D>syf
insertSort(data, mid + 1, r - mid); apQ` l^
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for (i = l; i <= mid; i++) { 0X =Yly*m@
temp = data; & xOEp
} GQ~wx1jj1
for (j = 1; j <= r - mid; j++) { >]uV
temp[r - j + 1] = data[j + mid]; |~vo
} 1?s]nU
int a = temp[l]; Sgp$B:
int b = temp[r]; lN"%~n?
for (i = l, j = r, k = l; k <= r; k++) {
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if (a < b) { qTFktJZw
data[k] = temp[i++]; 3>%oGbo
a = temp; 4kZX$ct}
} else { Z^w11}
data[k] = temp[j--]; U6V+jD}L]
b = temp[j]; >g8H
} D.?Rc'yD
} ~_^#/BnAl
} k fS44NV
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/** h6c0BmS{1
* @param data t3%[C;@wB
* @param l FTvFtdY
* @param i j?sq i9#
*/ '?Fw]z1$
private void insertSort(int[] data, int start, int len) { K4938
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for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); -Bymt[
} 2uw1R;zw
} 9&e=s<6dO
} 2t'^
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}