归并排序: '`XX
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package org.rut.util.algorithm.support; Lv'D^'I
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import org.rut.util.algorithm.SortUtil; DV\`Wv
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/** j^;I3_P
* @author treeroot jGEt+\"/QJ
* @since 2006-2-2 lm xr oHE
* @version 1.0 -t2+|J*
*/ -#2)?NkeE
public class MergeSort implements SortUtil.Sort{ @:U+9[
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/* (non-Javadoc) @W^| ?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) P '>SmQ
*/ }p!HT6 tZ
public void sort(int[] data) { /u0'
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int[] temp=new int[data.length]; 5fm?Lxr&?
mergeSort(data,temp,0,data.length-1); kIGbG;"_
} niqN{
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private void mergeSort(int[] data,int[] temp,int l,int r){ gOr%!QaF
int mid=(l+r)/2; 72X0Tq 4
if(l==r) return ; 0qo)."V{
mergeSort(data,temp,l,mid); T.We: ,{
mergeSort(data,temp,mid+1,r); AjT%]9
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for(int i=l;i<=r;i++){ Xy@7y[s]
temp=data; 9$Xu,y
} 2Ri{bWi
int i1=l; /}PF\j9#4
int i2=mid+1; 9(5OeH6o?
for(int cur=l;cur<=r;cur++){ GHsilba
if(i1==mid+1) qnoNT%xazo
data[cur]=temp[i2++]; s_>
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else if(i2>r) (d<4"!
data[cur]=temp[i1++]; )@L'wW
else if(temp[i1] data[cur]=temp[i1++]; e?Ho a$k
else Rhe Re
data[cur]=temp[i2++]; @~#Ym1{W
} ooV3gj4
} rN%F)
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改进后的归并排序: ,daKC
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package org.rut.util.algorithm.support; RgGyoZ
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import org.rut.util.algorithm.SortUtil; FI<q@HF
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/** ~,BIf+\XF
* @author treeroot :sP!p`dl
* @since 2006-2-2 3Ezy %7
* @version 1.0 jWY$5Vq<H
*/ ?APeR,"V
public class ImprovedMergeSort implements SortUtil.Sort { 13+<Q \
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private static final int THRESHOLD = 10; #Ap;_XcKw
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/* OI?K/rn
* (non-Javadoc) ph_4q@
* 7yz4'L
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Vm df8[5
*/ n':! ,a[
public void sort(int[] data) { .p=sBLp8
int[] temp=new int[data.length]; *0}3t<5
mergeSort(data,temp,0,data.length-1); ^kgBa2 7
} ~{D[
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private void mergeSort(int[] data, int[] temp, int l, int r) { (&P9+Tl
int i, j, k; 0q*r
int mid = (l + r) / 2; 1I*7SkgKv
if (l == r) z9p05NFH
return; 3 HIz9F(
if ((mid - l) >= THRESHOLD) Rt{B(L.?<
mergeSort(data, temp, l, mid); oh
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else &E40*
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insertSort(data, l, mid - l + 1); :Mcu
if ((r - mid) > THRESHOLD) BA:yQ
mergeSort(data, temp, mid + 1, r); 2PeR
else E^rbcGJ
insertSort(data, mid + 1, r - mid); =Me5ftw
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for (i = l; i <= mid; i++) { PI~1GyJr@;
temp = data; [b/k3&O'
} tBm_YP[
for (j = 1; j <= r - mid; j++) { i:cXwQG}B
temp[r - j + 1] = data[j + mid]; Pf$pt
} r 3M1e+'fc
int a = temp[l]; DwV4o^J:l
int b = temp[r]; `zR+ tbm
for (i = l, j = r, k = l; k <= r; k++) { Kv rX{F=
if (a < b) { cPl`2&p
data[k] = temp[i++]; 1tJg#/?
a = temp; uU> wg*m
} else { A#W?2k9
data[k] = temp[j--]; g1UGd
b = temp[j]; rx5B=M
} 1O!/g
} DEw8*MN
} I"t(%2*q
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/** V=X:=
* @param data ; h`0ir4[A
* @param l )m&U#S _;
* @param i H%1$,]F
*/ Maqf[
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private void insertSort(int[] data, int start, int len) { p)=~% 7DV
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); YqV8D&I
} 4:sjH.u<
} HeK
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} 6SC,;p=
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}