归并排序: :VN<,1s9p^
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package org.rut.util.algorithm.support; A^ ,(Vyd
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import org.rut.util.algorithm.SortUtil; ]nX.zE|F
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/** (X!/tw,.
* @author treeroot p~8~EQFj
* @since 2006-2-2 X3W)c&Pr
* @version 1.0 @1]<LQ\\
*/ +ypG<VBx%
public class MergeSort implements SortUtil.Sort{ \=N
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/* (non-Javadoc) 9Biw!%a
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Dx <IS^>i
*/ !FSraW2
public void sort(int[] data) { &]LwK5SR
int[] temp=new int[data.length]; H&03>.b
mergeSort(data,temp,0,data.length-1); |Y'$+[TE
} p1?}"bHk
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private void mergeSort(int[] data,int[] temp,int l,int r){ A^K,[8VX
int mid=(l+r)/2; M%B[>pONb7
if(l==r) return ; l m
mergeSort(data,temp,l,mid); e-e{-pB6
mergeSort(data,temp,mid+1,r); 5)nv
for(int i=l;i<=r;i++){ }qKeX4\-
temp=data; >`{i[60r
} BB%(!O4Dl
int i1=l; (Wx)YI
int i2=mid+1; Ap!UX=HBb
for(int cur=l;cur<=r;cur++){ 0H>Fyl2_
if(i1==mid+1) 7_K(xmK
data[cur]=temp[i2++]; tjd"05"@:
else if(i2>r) vj^UF(X
data[cur]=temp[i1++]; ZH0f32K
else if(temp[i1] data[cur]=temp[i1++]; Hzj*X}X#K
else $AXz/fGV
data[cur]=temp[i2++]; %x927I>
} O]Kb~jkd
} }TF<C!]
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改进后的归并排序: jSG
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package org.rut.util.algorithm.support; M`>W'<
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import org.rut.util.algorithm.SortUtil; F}AbA pTv
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/** W^Rb~b^?
* @author treeroot 9~; Ju^b
* @since 2006-2-2 _yoG<qI
* @version 1.0 QE #$bCw
*/ =TP>Y"
public class ImprovedMergeSort implements SortUtil.Sort { \
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private static final int THRESHOLD = 10; mCE})S
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/* SRD&Uf0M
* (non-Javadoc) Rke:*(p*n;
* 8@A[`5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) :9`1bZ?a
*/ f.f4<_v'h
public void sort(int[] data) { 5o3_x ~e
int[] temp=new int[data.length]; L|Ydd!m
mergeSort(data,temp,0,data.length-1); sN g"JQ
} ZH}NlEn
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private void mergeSort(int[] data, int[] temp, int l, int r) { -of= Lp
int i, j, k; ('lnQD.Hd
int mid = (l + r) / 2; 7 %|>7
if (l == r) 19rUvgC{M
return; #_7c>gn
if ((mid - l) >= THRESHOLD) %nC Uct@c
mergeSort(data, temp, l, mid); ?hmb"^vlG
else 62_$O"
insertSort(data, l, mid - l + 1); i4pJIb
if ((r - mid) > THRESHOLD) 0K2[E^.WN
mergeSort(data, temp, mid + 1, r); :RQ[(zD]
else MMAC,4
insertSort(data, mid + 1, r - mid); IW1\vfe
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for (i = l; i <= mid; i++) { b5|p#&YK~
temp = data; amSyGQ2
} )aC+qhh
for (j = 1; j <= r - mid; j++) { JdRs=#X
temp[r - j + 1] = data[j + mid]; >'jM8=o*Ax
} CS{9|FNz
int a = temp[l]; E+)Go-rS(
int b = temp[r]; sWC"^ S o
for (i = l, j = r, k = l; k <= r; k++) { {DK:"ep
if (a < b) { L[bGO|O
data[k] = temp[i++]; BJE <~"
a = temp; U .Od
} else { bGJUu#
data[k] = temp[j--]; {
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b = temp[j]; 1P[Lz!C
} 3aqmK.`H
} &f yFUg
} LF~#4)B
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/** ~"mZ0E
* @param data I I8nz[s
* @param l 9y4rw]4zI
* @param i (=/F=,w
*/ v wyDY%B"n
private void insertSort(int[] data, int start, int len) { :=Q|gRTL*
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); +)@>60y
} 9y5\4&v
} ]xG8vy
} <e^/hR4O
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}