归并排序: eDm,8Se
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package org.rut.util.algorithm.support; 4$J/e?i
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import org.rut.util.algorithm.SortUtil; r=k}EP&<
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/** MqpoS
* @author treeroot *dTw$T#
* @since 2006-2-2 1Zecl);O{
* @version 1.0 p?`N<ykF<
*/ ,Q:dAe[ZsX
public class MergeSort implements SortUtil.Sort{ itvwmI,m\
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/* (non-Javadoc) F7hQNQu:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) |&'*Z\*ya
*/ M]2 c-
public void sort(int[] data) { 7%<jZ=
int[] temp=new int[data.length]; 2.[qcs3zl
mergeSort(data,temp,0,data.length-1); spI{d!c
} m&\Gz*)3
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private void mergeSort(int[] data,int[] temp,int l,int r){ WX[ycm8
int mid=(l+r)/2; zEGwQp<
if(l==r) return ; gV7o
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mergeSort(data,temp,l,mid); q8D1MEBL`
mergeSort(data,temp,mid+1,r); [brrziZ
for(int i=l;i<=r;i++){ ERZ[t\g)
temp=data; qvscf_%FM
} :K~7BJ(HO
int i1=l; U".-C`4v
int i2=mid+1; c;e,)$)-|
for(int cur=l;cur<=r;cur++){ ?BRL;( x
if(i1==mid+1) w"e2}iE7
data[cur]=temp[i2++]; +!<`$+W
else if(i2>r) W)_B(;$]
data[cur]=temp[i1++]; Z`%;bP:
else if(temp[i1] data[cur]=temp[i1++]; l{R)yTO
else -7`J(f.rYC
data[cur]=temp[i2++]; 4{R`
} n5i}J/Sa2
} k8ck#%#}Wu
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} y6s$.93
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改进后的归并排序: +u#x[xO
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package org.rut.util.algorithm.support; 0jmlsC>
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import org.rut.util.algorithm.SortUtil; .jKO 6f
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/** M~6I-HexT|
* @author treeroot WIghP5% W
* @since 2006-2-2 :Ls36E8f=
* @version 1.0 BpC Sf.zZ
*/ 5J;c;PF
public class ImprovedMergeSort implements SortUtil.Sort { u|ZO"t
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private static final int THRESHOLD = 10; _H,RcpyJ
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/* phdN9<Z
* (non-Javadoc) c1^3lgPv
* fwEi//1
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %F~
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*/ GyCpGP|AZ
public void sort(int[] data) { jt3SA
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int[] temp=new int[data.length]; j{=%~
mergeSort(data,temp,0,data.length-1); 2S;zze7)
} `et<Z
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private void mergeSort(int[] data, int[] temp, int l, int r) { [>0r'-kI
int i, j, k; :-Pj )Y{I
int mid = (l + r) / 2; 8M|Q^VeT,1
if (l == r) 7Tbk ti;
return; uv5@Alm
if ((mid - l) >= THRESHOLD) E;sltl
mergeSort(data, temp, l, mid); erqB/ C
else ~I<y^]2{
insertSort(data, l, mid - l + 1); $enh45Wy
if ((r - mid) > THRESHOLD) h2>0#Vp3j
mergeSort(data, temp, mid + 1, r); ,&-[$,
else kD>vQ?
insertSort(data, mid + 1, r - mid); [wR8q,2
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for (i = l; i <= mid; i++) { mAzW'Q4D
temp = data; d(!N$B\[5T
} 2XtQ"`)
for (j = 1; j <= r - mid; j++) { eG v"&kr
temp[r - j + 1] = data[j + mid]; z-DpLV
} ,b4&$W].
int a = temp[l]; 9E^piLA
int b = temp[r]; {>Px.%[<
for (i = l, j = r, k = l; k <= r; k++) { v4$,Vt:7
if (a < b) { zvD5i,I
data[k] = temp[i++]; 0u_'(Z-^2
a = temp; To`?<]8
} else { kQ8WO|bA
data[k] = temp[j--]; 7L*`nU|h
b = temp[j]; 3fPv71NVtt
} A=K1T]o
} wLbngO=VG
} =Ug_1w
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/** Q)>'fZ)
* @param data EMG*8HRI>r
* @param l ;j=1 oW
* @param i ]_?y[@ZP
*/ >y[S?M
private void insertSort(int[] data, int start, int len) { W=?87PkJu
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); keOW{:^i
} ;Y\,2b, xh
} UZra'+Wb
} mxGN[%ve
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}