归并排序: Bs@!S?
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package org.rut.util.algorithm.support; Quc,,#u
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import org.rut.util.algorithm.SortUtil; uCc.dluU
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/** r'kUU]j9
* @author treeroot cTA8F"UGD
* @since 2006-2-2 n{>Ge,enP0
* @version 1.0 D 8nt%vy
*/ @}#" o
public class MergeSort implements SortUtil.Sort{ Q*S|SH-cZ0
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/* (non-Javadoc) xbh4j!FD$
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) l7 +#gPA
*/
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public void sort(int[] data) { ZZkxEq+D
int[] temp=new int[data.length]; p2c4 <f-M
mergeSort(data,temp,0,data.length-1); QT1(= wK3
} ugtzF
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private void mergeSort(int[] data,int[] temp,int l,int r){ !]%M
int mid=(l+r)/2; t SST.o3
if(l==r) return ; C~do*rnM^
mergeSort(data,temp,l,mid); p!+7F\
mergeSort(data,temp,mid+1,r); 3)F9:Tzw1
for(int i=l;i<=r;i++){ Cm~h\+"
temp=data; \9U4V>p
} b#**`Y
int i1=l; ?4X8l@fR
int i2=mid+1; ;(a\F
for(int cur=l;cur<=r;cur++){ ;j#$d@VG"
if(i1==mid+1) f8ap+][
data[cur]=temp[i2++]; x=+R0ny
else if(i2>r) _xg4;W6M=
data[cur]=temp[i1++]; <@BzF0
else if(temp[i1] data[cur]=temp[i1++]; "[` .I*WNo
else 'C
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data[cur]=temp[i2++]; rAc
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} sU
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改进后的归并排序: )+^1QL
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package org.rut.util.algorithm.support; ;5wmQFr
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import org.rut.util.algorithm.SortUtil; 4T*RJ3Fz!
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/** r]XXN2[jO
* @author treeroot 5e!YYt>
* @since 2006-2-2 @ljvTgZ(X
* @version 1.0 %ZNp
*/ -1tdyCez
public class ImprovedMergeSort implements SortUtil.Sort { OD,"8JF
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private static final int THRESHOLD = 10; N=qe*Rlf
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/* NF&
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* (non-Javadoc) dcFqK~
* %5X}4k!p
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) go, Hfb
*/ N4 O'{
public void sort(int[] data) { rm7$i9DH2
int[] temp=new int[data.length]; &&iZ?JteZ
mergeSort(data,temp,0,data.length-1); 8\Y/?$on
} xy@1E;
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private void mergeSort(int[] data, int[] temp, int l, int r) { K^V*JH\G
int i, j, k; {HV$hU+_)Q
int mid = (l + r) / 2; SZOcFmC?
if (l == r) P!?Je/Tz]
return; 8S&Kf>D
if ((mid - l) >= THRESHOLD) q!iMc
mergeSort(data, temp, l, mid); L lP
else Qm|Q0u
insertSort(data, l, mid - l + 1); '4PAH2&n
if ((r - mid) > THRESHOLD) ,&S^R yc
mergeSort(data, temp, mid + 1, r); U @Il:\I
else ;4jRsirx9
insertSort(data, mid + 1, r - mid); Mr}]P(4h
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for (i = l; i <= mid; i++) { ]Gw? DD|Gn
temp = data; S~"1q 0
} 32_{nLV$[
for (j = 1; j <= r - mid; j++) { \`w!v,aM$
temp[r - j + 1] = data[j + mid]; X-oHQu5
} Q AJX7
int a = temp[l]; B;M{v5s~]
int b = temp[r]; 39;Z+s";
for (i = l, j = r, k = l; k <= r; k++) { =*q|568
if (a < b) { lVywc:X
data[k] = temp[i++]; 4\HB rd#P
a = temp; h&7]Bp
} else { [3a-1,
data[k] = temp[j--]; o0- 7# 2
b = temp[j]; AL.zF\?
} /o=V
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} K\ww,S
} 2Wlk]
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/** 6qA48:/F=
* @param data _=c>>X
* @param l $9znRTFEj
* @param i )!1; =
*/ J@ x%TA
private void insertSort(int[] data, int start, int len) { Sd;/yC 8
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); KlgPDV9mg
} $or?7 w>
} }i1p&EN^
} )hH9VGZq(
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}