归并排序: qpH j4
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package org.rut.util.algorithm.support; EU`'
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import org.rut.util.algorithm.SortUtil; B3ohHxHu
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/** (gs`=H*d;
* @author treeroot \JF57t}Zk
* @since 2006-2-2 D/+@d:- G
* @version 1.0 T\<M?`Y
*/ NB~*sP-l&
public class MergeSort implements SortUtil.Sort{ ~hxeD" w
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/* (non-Javadoc) V>~*]N^f
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 4nX'a*'D~}
*/ A- <.#
public void sort(int[] data) { WV9[DFU
int[] temp=new int[data.length]; <v1_F;{n
mergeSort(data,temp,0,data.length-1); EBN]>zz
} C.B8 J"T-
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private void mergeSort(int[] data,int[] temp,int l,int r){ zIX}[l4EW~
int mid=(l+r)/2; 8'
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if(l==r) return ; ^hGZVGSv
mergeSort(data,temp,l,mid); )wyu+_:
mergeSort(data,temp,mid+1,r); N^@%qUvT]
for(int i=l;i<=r;i++){ ur,V>J<5A
temp=data; gK] T}
} 1tuator
int i1=l;
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int i2=mid+1; [qc6Q:
for(int cur=l;cur<=r;cur++){ \!?
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if(i1==mid+1) dUBVp 9PB
data[cur]=temp[i2++]; z.Ve#~\
else if(i2>r) q[We][Nrzb
data[cur]=temp[i1++]; 2=/-d$
else if(temp[i1] data[cur]=temp[i1++]; `UzCq06rJ1
else M[&.kH
data[cur]=temp[i2++]; HzFt
} ul]m>W
} $)WH^Ir~
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改进后的归并排序: }VJ hw*s
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package org.rut.util.algorithm.support; kG~ivB}x
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import org.rut.util.algorithm.SortUtil; -&HoR!af
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/** ZFd{q)qe
* @author treeroot g
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* @since 2006-2-2 g]TI8&tP!L
* @version 1.0 123-i,epg
*/ PdE)m/
public class ImprovedMergeSort implements SortUtil.Sort { -qr:c9\px
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private static final int THRESHOLD = 10; o 2$<>1^
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/* ~"hAb2
* (non-Javadoc) 'ra_Zg[j
* OHXeqjhy
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) YC+ZVp"v
*/ //@sktHsw(
public void sort(int[] data) { yp7,^l
int[] temp=new int[data.length]; Phjf$\pt
mergeSort(data,temp,0,data.length-1); |7 W6I$Xl
} >O[^\H!\
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private void mergeSort(int[] data, int[] temp, int l, int r) { #|2g{7g*
int i, j, k; qoyGs}/I8
int mid = (l + r) / 2; 4$#ia
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if (l == r) O,z%7><
return; 1tK6lrhj
if ((mid - l) >= THRESHOLD) =V4_DJ(&
mergeSort(data, temp, l, mid); vzT6G/
else c_j)8
insertSort(data, l, mid - l + 1); WLA_YMlA
if ((r - mid) > THRESHOLD) [Nzg
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mergeSort(data, temp, mid + 1, r); K<fq=:I3
else ^9m^#"ZW`
insertSort(data, mid + 1, r - mid); [pyXX>:M
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for (i = l; i <= mid; i++) { Q-3J0=
temp = data; }F9?*2\/
} f+(w(~O
for (j = 1; j <= r - mid; j++) { 5la]l
temp[r - j + 1] = data[j + mid]; rea}Uq+po
} [&k& $04_
int a = temp[l]; %PNm7s4x2
int b = temp[r]; > & lg
for (i = l, j = r, k = l; k <= r; k++) { F$pd]F!#
if (a < b) { & m ";D
data[k] = temp[i++]; -O,O<tOm
a = temp; S7~l%G>]b
} else { nD{;4$xP`
data[k] = temp[j--]; 5=;I|l,
b = temp[j]; & ;x1Rx
} Zm'::+tl
} wBaFC\CW
} d3q/mg 5a
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/** k?*DBXJv
* @param data =u1w\>( 2Y
* @param l ri_6wbPp
* @param i `oI/;&
*/ ~+NFWNgN
private void insertSort(int[] data, int start, int len) { \|4MU"ri
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); J}` $WL:
} )^a#Xn3z
} [/`Hz]R
} _TeRsA
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}