归并排序: r{9fm,
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package org.rut.util.algorithm.support; %dg[ho
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import org.rut.util.algorithm.SortUtil; \#t)B
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/** 2M'dTXz
* @author treeroot #Gg^QJ*
* @since 2006-2-2 3oMHy5
* @version 1.0 lV%1I@[M
*/ B 5|\<CF
public class MergeSort implements SortUtil.Sort{ p^|l ',e
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/* (non-Javadoc) 4}v|^_x-i
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) X_hDU~5{wC
*/ >20dK
public void sort(int[] data) { *|dK1'Xr
int[] temp=new int[data.length]; 6{HCF-cQd
mergeSort(data,temp,0,data.length-1); @;P ;iI
} !p/?IW+
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private void mergeSort(int[] data,int[] temp,int l,int r){ ~vt9?(h
int mid=(l+r)/2; z_fjmqa?
if(l==r) return ; {#k[-\|;
mergeSort(data,temp,l,mid); k-=LD
mergeSort(data,temp,mid+1,r); 3S7"P$q
for(int i=l;i<=r;i++){ 5HV+7zU5
temp=data; cS9jGD92
} 0O>ClE~P
int i1=l; ; s/<wx-C
int i2=mid+1; t'Wv?,
for(int cur=l;cur<=r;cur++){ 3EICdC
if(i1==mid+1) {XmCG%%L
data[cur]=temp[i2++]; C\GP}:[T3
else if(i2>r) r.\L@Y<
data[cur]=temp[i1++]; 3wq<@dRv4
else if(temp[i1] data[cur]=temp[i1++]; n%7?G=_kj
else F. SB_S<'
data[cur]=temp[i2++]; '1gfXC
} fyb;*hgu
} =#S.t:HQ*
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} yEI@^8]s
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改进后的归并排序: lFyDH{!
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package org.rut.util.algorithm.support; 0yI1r7yNB+
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import org.rut.util.algorithm.SortUtil; $}gMJG
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/** :]m.&r S,
* @author treeroot ^U*y*l$
* @since 2006-2-2 ,
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* @version 1.0 M}V!;o<t^
*/ -{xk&EB^$5
public class ImprovedMergeSort implements SortUtil.Sort { 4\Y5RfLB_
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private static final int THRESHOLD = 10; E=p+z"Ui
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/* i.vH$
* (non-Javadoc) "s(~k
* (?na|yd
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &3[oM)-V
*/ bx8](cT_
public void sort(int[] data) { eyCZ[SC
int[] temp=new int[data.length]; Icnhet4
mergeSort(data,temp,0,data.length-1); No'?8 +i
} =1l6(pJ
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private void mergeSort(int[] data, int[] temp, int l, int r) { YNEwX$)M,B
int i, j, k; L=4+rshl!_
int mid = (l + r) / 2; v3I^81
if (l == r) D0r viO
return; uw}Rr7q
if ((mid - l) >= THRESHOLD) CJ
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mergeSort(data, temp, l, mid); |`5IP8Z
else qz-QVY,
insertSort(data, l, mid - l + 1); t;e&[eg
if ((r - mid) > THRESHOLD) gsk?
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mergeSort(data, temp, mid + 1, r); d#g))f;
else f2i:I1 p("
insertSort(data, mid + 1, r - mid); 6l]X{ A.
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for (i = l; i <= mid; i++) { hH8&g%{2
temp = data; &]nx^C8V;
} @Jzk2,rI
for (j = 1; j <= r - mid; j++) { FE~D:)Xj'?
temp[r - j + 1] = data[j + mid];
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} @NiuT%#c
int a = temp[l]; D@O`"2
int b = temp[r]; E(jZ Do
for (i = l, j = r, k = l; k <= r; k++) { D0D=;k
if (a < b) { 8h=t%zMSb
data[k] = temp[i++]; ->sxz/L
a = temp; EhcJE;S)
} else { $TI^8 3
data[k] = temp[j--]; 9L=mS
b = temp[j]; Aqyw
} v ,8;:
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} D|:'|7l W
} ^3;B4tj[
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/** sdFHr4
* @param data KGz Nj%
* @param l p['RV
* @param i `JySuP2~/
*/ U\KMeaF5e-
private void insertSort(int[] data, int start, int len) { e97G]XLR
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Pq;OShU_
} -@pjEI
} hyI7X7Hy
} aZFpt/.d
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}