归并排序: caD;V(
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package org.rut.util.algorithm.support; J?fh3RW9
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import org.rut.util.algorithm.SortUtil; UROi.976D
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/** /j@ `aG(a
* @author treeroot !5t 3Y
* @since 2006-2-2 4{t$M} ?N
* @version 1.0 2tm-:CPG
*/ ~la04wR28
public class MergeSort implements SortUtil.Sort{ >Fk`h=Wd
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/* (non-Javadoc) v=-3 ,C
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Qp&ySU8
*/ z}8L}:
public void sort(int[] data) { :=v{inN
int[] temp=new int[data.length]; #q.G_-H4J@
mergeSort(data,temp,0,data.length-1); 6*33k'=;F
} u?Mu*r?
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private void mergeSort(int[] data,int[] temp,int l,int r){ ld:alEo
int mid=(l+r)/2; ?4Juw?
if(l==r) return ; 2_b'mepV
mergeSort(data,temp,l,mid); ~(^*?(Z
mergeSort(data,temp,mid+1,r); K/m)f#
for(int i=l;i<=r;i++){ u@u.N2H.%
temp=data; z>;+'>XXgx
} u(WQWsN
int i1=l; rss.F3dK
int i2=mid+1; w*}yw"gP*0
for(int cur=l;cur<=r;cur++){ [iy;}5XK
if(i1==mid+1) ~c$ts&Cl
data[cur]=temp[i2++]; C?|3\@7
else if(i2>r) ~9YA!48
data[cur]=temp[i1++]; [c[MQA0
else if(temp[i1] data[cur]=temp[i1++]; ~U6YN_W
else utJVuJw:t
data[cur]=temp[i2++]; #(g+jb0E
} b7sE
} >1I2R/'
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改进后的归并排序: 8'WMspX
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package org.rut.util.algorithm.support; ai
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import org.rut.util.algorithm.SortUtil; ^|i\d\
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/** `R52{B#&/
* @author treeroot $_zkq@
* @since 2006-2-2 m&0BbyE.z
* @version 1.0 G_N-}J>EP
*/ 1za'u_
public class ImprovedMergeSort implements SortUtil.Sort { ~.9o{?pbG
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private static final int THRESHOLD = 10; *@n3>$
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/* \(U" _NPp
* (non-Javadoc) T_tDpq_|
* f"<@6Axq
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7h#faOP
*/ 7e{X$'
public void sort(int[] data) { ^@*zH?Rx{
int[] temp=new int[data.length]; 3_*Xk.
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mergeSort(data,temp,0,data.length-1); &Yf#O*
} pkN:D+gS
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private void mergeSort(int[] data, int[] temp, int l, int r) { v&b.Q:h*'
int i, j, k; ~73i^3yf
int mid = (l + r) / 2; <kXV1@>
if (l == r) &Pg-|Ql
return; K&IrTA
j}
if ((mid - l) >= THRESHOLD) jw(>@SXz
mergeSort(data, temp, l, mid); Xm=^\K3
else ngY+Ym
insertSort(data, l, mid - l + 1); io r [v
if ((r - mid) > THRESHOLD) ?}3PJVy?
mergeSort(data, temp, mid + 1, r); m{$tO;c/Q
else %3c|
insertSort(data, mid + 1, r - mid); :&0yf;>v
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for (i = l; i <= mid; i++) { bqQO E4;
temp = data; n]C%(v!u3
} =Q8H]F
for (j = 1; j <= r - mid; j++) { 8Z4?X%
temp[r - j + 1] = data[j + mid]; 7l#2,d4
}
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int a = temp[l]; *&dW\fx
int b = temp[r]; q]i(CaKh
for (i = l, j = r, k = l; k <= r; k++) { f{^M.G@
if (a < b) { k#Ez
data[k] = temp[i++]; <K#'3&*$s
a = temp; (4/]dTb
} else { W93JY0Ls9|
data[k] = temp[j--]; yw*mA1v
b = temp[j]; :m++ iR
} !(]dz~sM
} g#'fd/?Q
} |j~EV~AJ
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/** ( ztim
* @param data =2nn "YVP
* @param l wsJ%*
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* @param i U!\2K~
*/ Dz8:;$/
private void insertSort(int[] data, int start, int len) {
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for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); WE.$a t{*h
} u3*NO
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} $vTAF-~Ql
} \>Ga-gv6/
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}