归并排序: 5dm ~yQN/
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package org.rut.util.algorithm.support; uZC=]Ieh
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import org.rut.util.algorithm.SortUtil; rP:g`?*V
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/** }:0_%=)N<
* @author treeroot ob\-OMNs@
* @since 2006-2-2 OP`f[lCiL
* @version 1.0 hx9{?3#
*/ --WQr]U/
public class MergeSort implements SortUtil.Sort{ /K#k_k
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/* (non-Javadoc) m\56BP-AM
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 5dePpF D5
*/ ~w?02FU
public void sort(int[] data) { e$J>z {
int[] temp=new int[data.length]; C^L+R7
mergeSort(data,temp,0,data.length-1); M]s\F(*ib
} pR61bl)
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private void mergeSort(int[] data,int[] temp,int l,int r){ <E2 IU~e
int mid=(l+r)/2; e$Ksn_wEq
if(l==r) return ; BS9VwG<Z
mergeSort(data,temp,l,mid); 7%y$^B7{
mergeSort(data,temp,mid+1,r); $ln8Cpbca
for(int i=l;i<=r;i++){ ib=)N)l
temp=data; Dh8ECy5k<*
} gQ_<;'m)2
int i1=l; )2&3D"V
int i2=mid+1; tm+*ik=x|
for(int cur=l;cur<=r;cur++){ pey=zR!
if(i1==mid+1) G?s9c0f
data[cur]=temp[i2++]; o;$xN3f,
else if(i2>r) 'JOUx_@z
data[cur]=temp[i1++]; ;7'O=%
else if(temp[i1] data[cur]=temp[i1++]; $Zu?Gd?
else +V4)><
data[cur]=temp[i2++]; gJQ#j~'
} :W.H#@'(
} rYb5#aT[
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} EhxpMTS
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改进后的归并排序: `HX:U3/
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package org.rut.util.algorithm.support; rfqwxr45h
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import org.rut.util.algorithm.SortUtil; `D4Wg<,9
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/** x3q^}sj%
* @author treeroot .KrLvic
* @since 2006-2-2 ?2]fE[SqY
* @version 1.0 @7Ec(]yp
*/ f/)Y {kS6
public class ImprovedMergeSort implements SortUtil.Sort { ui%#f1Iq
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private static final int THRESHOLD = 10; q`9.@u@ a
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/* ,b*?7R
* (non-Javadoc) CD&a_-'z$K
* $94lF~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) y\T$) XGV
*/ ZC?~RXL(
public void sort(int[] data) { t<45[~[
int[] temp=new int[data.length]; (Ceru o S
mergeSort(data,temp,0,data.length-1); i!a!qE.1
} `NIb?/!f
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private void mergeSort(int[] data, int[] temp, int l, int r) { t\M6 d6
int i, j, k; 3Bl|~K;-
int mid = (l + r) / 2; Nf| 0O\+%y
if (l == r) 9^a|yyzL
return; `=(<!nXJx
if ((mid - l) >= THRESHOLD) C
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mergeSort(data, temp, l, mid); bBi>BP=
else %p 6Ms
insertSort(data, l, mid - l + 1); s ~Eo]e
if ((r - mid) > THRESHOLD) k=s^-Eiu
mergeSort(data, temp, mid + 1, r); ``/L18
else k8s)PN
insertSort(data, mid + 1, r - mid); Cog }a
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for (i = l; i <= mid; i++) { {8m&Z36E
temp = data; Qw0k-t0=4
} Cff6EE
for (j = 1; j <= r - mid; j++) { *y4DK6OFe
temp[r - j + 1] = data[j + mid]; xm{?h,U,
} P.Ntjz/B
int a = temp[l]; 5gf
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int b = temp[r]; |Yl i~Qx
for (i = l, j = r, k = l; k <= r; k++) { C?H~L
if (a < b) { 2 5~Z%_?
data[k] = temp[i++]; \l!+l
a = temp; =F\Xt "
} else { Vh0cac|X
data[k] = temp[j--]; 7m#EqF$P
b = temp[j]; I#OZ:g^
} %Xc,l Y1?
} :W)lt28_
} Zf$mwRS[_
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/** <-1:o*8:}
* @param data rZgu`5<a
* @param l -
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* @param i =X'[r
*/ KpGx<+0p
private void insertSort(int[] data, int start, int len) { ;-3&yQ7N)
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); X5o*8Bg4M
} q7CLxv
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} pLu5x<
} aVR!~hvFs
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}