归并排序: LOA
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package org.rut.util.algorithm.support; H(AYtnvB
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import org.rut.util.algorithm.SortUtil; .D) }MyKnu
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/**
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* @author treeroot uPqPoI>N!
* @since 2006-2-2 w+}dm^X
* @version 1.0 'i,<j
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*/ :K&hGZ+5
public class MergeSort implements SortUtil.Sort{ P.wINo
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/* (non-Javadoc) O<Kr6+
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) gW, ET
*/ #RSxo
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public void sort(int[] data) { XBc+_=)$
int[] temp=new int[data.length]; }bHpFe
mergeSort(data,temp,0,data.length-1); "mOoGy,(
} HGKm?'['
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private void mergeSort(int[] data,int[] temp,int l,int r){ "P|G^*"~2
int mid=(l+r)/2; d0xV<{,-
if(l==r) return ; @@5u{K
mergeSort(data,temp,l,mid); `A'*x]l
mergeSort(data,temp,mid+1,r); X#o:-FKf
for(int i=l;i<=r;i++){ ABSeX
temp=data; A=])pYE1
} 8RK\B%UW
int i1=l; saZ;ixV
int i2=mid+1; Y7p#K<y]9
for(int cur=l;cur<=r;cur++){ 0I
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if(i1==mid+1) s?2;u p*D
data[cur]=temp[i2++]; ?SpI^Wn)[
else if(i2>r) _ %P%~`?!
data[cur]=temp[i1++]; l9Vim9R5T
else if(temp[i1] data[cur]=temp[i1++]; Ax\Fg
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else N@VD-}E
data[cur]=temp[i2++]; E|6|m8
} 81g&WQ'
} jm?mO9p~
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改进后的归并排序: qg|+BIiUz
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package org.rut.util.algorithm.support; ,s2.l/5r;C
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import org.rut.util.algorithm.SortUtil; &sRyM'XI
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/** / [19ITZ
* @author treeroot #B?7{#.1
* @since 2006-2-2 MVCCh+,GI
* @version 1.0 C+iP
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*/ 9GEcs(A*
public class ImprovedMergeSort implements SortUtil.Sort { X4TUi8ht!]
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private static final int THRESHOLD = 10; itvwmI,m\
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/* F7hQNQu:
* (non-Javadoc) |&'*Z\*ya
* M]2 c-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7%<jZ=
*/ 2.[qcs3zl
public void sort(int[] data) { spI{d!c
int[] temp=new int[data.length]; m&\Gz*)3
mergeSort(data,temp,0,data.length-1); zf!c
} WX[ycm8
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private void mergeSort(int[] data, int[] temp, int l, int r) { gV7o
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int i, j, k; q8D1MEBL`
int mid = (l + r) / 2; [brrziZ
if (l == r) ERZ[t\g)
return; qvscf_%FM
if ((mid - l) >= THRESHOLD) '=2t(@aC
mergeSort(data, temp, l, mid); U".-C`4v
else c;e,)$)-|
insertSort(data, l, mid - l + 1); Grqs*V &|g
if ((r - mid) > THRESHOLD) w"e2}iE7
mergeSort(data, temp, mid + 1, r); Xnh1pwDhe<
else w5;EnI
insertSort(data, mid + 1, r - mid); Z`%;bP:
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for (i = l; i <= mid; i++) { KV6S-
temp = data; `7j,njCX.
} LiRY-;8=
for (j = 1; j <= r - mid; j++) { 5Q88OxH
temp[r - j + 1] = data[j + mid]; M(BZ<,9V
} $@xkKe"
int a = temp[l]; oHYD6qJX{
int b = temp[r]; s6egd%r
for (i = l, j = r, k = l; k <= r; k++) { HI?>]zz|
if (a < b) { {\e}43^9N
data[k] = temp[i++]; }8SHw|-
a = temp; 4EK[gM8
} else { V OX>Sl
data[k] = temp[j--]; PTP2QAt
b = temp[j]; D%A-& =
}
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} Hke\W'&
} b-Hn=e _
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/** Dmw,Bi*
* @param data f[RnL#*xJU
* @param l <ZiO[dEV
* @param i 7^L&YVW
*/ S]N4o'K}q
private void insertSort(int[] data, int start, int len) { "f3>20}
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); PEWzqZ|!;
} $Yka\tS'
} 87Kx7CKF"
} d
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}