归并排序: ^2 H-_
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package org.rut.util.algorithm.support; _h \L6.
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import org.rut.util.algorithm.SortUtil; "u^vBd[}
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/** ~$C<^?"b
* @author treeroot Gos#=H
* @since 2006-2-2 Y@#N_]oXj
* @version 1.0 trrK6(p
*/ z_lKq}^~6
public class MergeSort implements SortUtil.Sort{ *s"OqTM]x
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/* (non-Javadoc) lVq5>:'}^;
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9kF0H
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*/ l4U*Lv>
public void sort(int[] data) { 4lc|~Fj++
int[] temp=new int[data.length]; %`T}%B
mergeSort(data,temp,0,data.length-1); chUYLX}45
} !03JA 9lo
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private void mergeSort(int[] data,int[] temp,int l,int r){ WwZ3hd
int mid=(l+r)/2; s$fX
;
if(l==r) return ; Ai[@2A yU
mergeSort(data,temp,l,mid); K$qY^oyQFw
mergeSort(data,temp,mid+1,r); 3(t,x
for(int i=l;i<=r;i++){ qwJp&6
temp=data; NQ[X=a8N
} F<6(Hw#>
int i1=l; }v|_]
int i2=mid+1; +_pfBJ_$%
for(int cur=l;cur<=r;cur++){ XR7v\rd
if(i1==mid+1) rFzj\%xa[
data[cur]=temp[i2++]; tN\I2wm
else if(i2>r) o@.{|j
data[cur]=temp[i1++]; qWWt5rJ
else if(temp[i1] data[cur]=temp[i1++]; lOeX5%$Z
else !1i-"rR
data[cur]=temp[i2++]; R-NM ~gp
} &k_*Y-l7]
} umq6X8K
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} Keo<#Cc?
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改进后的归并排序: zng.(]U/?H
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package org.rut.util.algorithm.support; /J_],KdU
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import org.rut.util.algorithm.SortUtil; C,eP!_O
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/** R_+:nCB@,
* @author treeroot 82EvlmD
* @since 2006-2-2 Z#Nw[>NN*
* @version 1.0 WrDFbcH
*/
%!nN<%
public class ImprovedMergeSort implements SortUtil.Sort { `JiWS
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private static final int THRESHOLD = 10; |,oLZCNa
E' `;
/* yn]Sc<uK
* (non-Javadoc) Lhux~,EH
* OOXSJE1
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 2P8wvNDG
*/ w5PscEc
public void sort(int[] data) { %(khE-SW
int[] temp=new int[data.length]; fw,,cu`YA
mergeSort(data,temp,0,data.length-1); m{RXt
} %}zkmEY.e
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private void mergeSort(int[] data, int[] temp, int l, int r) { O<L=N-
int i, j, k; U*Y]cohh
int mid = (l + r) / 2; 2/V%jS[4#y
if (l == r) |T/OOIA=sI
return; a5ZXrWv
if ((mid - l) >= THRESHOLD) ?uL-qsU
mergeSort(data, temp, l, mid); x X3I`
else Q[NoFZ
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insertSort(data, l, mid - l + 1); ~>9G\/u j
if ((r - mid) > THRESHOLD) bK0(c1*a[e
mergeSort(data, temp, mid + 1, r); 9,_~qWw
else S g1[p#U
insertSort(data, mid + 1, r - mid); SZr c-f_
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for (i = l; i <= mid; i++) { fu~iF
temp = data; f9>pMfi:@
} yBs-bp"-
for (j = 1; j <= r - mid; j++) { WLj]EsA.
temp[r - j + 1] = data[j + mid]; [@VzpVhXz
} G[ #R 1'
int a = temp[l]; SS`\_@ci
int b = temp[r]; )mOM!I7D@
for (i = l, j = r, k = l; k <= r; k++) { weu+$Kr
if (a < b) { +8?18@obp
data[k] = temp[i++]; ,qp8Rg|3j
a = temp; 3]JJCaf
} else { ."BXA8c;A
data[k] = temp[j--]; juF=ZW%i
b = temp[j]; *Us}E7/"'
} L(Twclrb
} {vW0O &[
} \rUKP""m
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/** 5;/q[oXI
* @param data }2RbX,0l9
* @param l E+XS7':I
* @param i LB]3-FsU+
*/ K O\HH
private void insertSort(int[] data, int start, int len) { +l)t5Mg\
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); JS m7-p|E
} 0H4|}+e
} e4Ibj/
}
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}