归并排序: oH@78D0A
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package org.rut.util.algorithm.support; * 4'"2"
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import org.rut.util.algorithm.SortUtil; Jy)/%p~
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/** rI\FI0zIp_
* @author treeroot {}9a6.V;}
* @since 2006-2-2 3";q[&F9y
* @version 1.0 MgZ/(X E
*/ 4#D,?eA7
public class MergeSort implements SortUtil.Sort{ dtDFoETz
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/* (non-Javadoc) '1[Ft03
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) cAw/I@jG
*/ Yy8g(bU
public void sort(int[] data) { 4W75T2q#
int[] temp=new int[data.length]; 2?C)&
mergeSort(data,temp,0,data.length-1); wYea\^co
} LVyyO3e
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private void mergeSort(int[] data,int[] temp,int l,int r){
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int mid=(l+r)/2; KI.unP%
if(l==r) return ; *. t^MP
mergeSort(data,temp,l,mid); W?&%x(6M
mergeSort(data,temp,mid+1,r); xT8?&Bx
for(int i=l;i<=r;i++){ iZmcI;?u
temp=data; =pNY
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} UKGPtKE<
int i1=l; *~`(RV
int i2=mid+1; h[ ZN+M
for(int cur=l;cur<=r;cur++){ i8p6Xht
if(i1==mid+1) " bG2:
data[cur]=temp[i2++]; PT
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else if(i2>r) G@0&8
data[cur]=temp[i1++]; V`5O{Gg
else if(temp[i1] data[cur]=temp[i1++]; +@UV?"d
else 42{~Lhxt
data[cur]=temp[i2++]; gYj'(jB
} 7zMr:JmV
} %T[]zJ(
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} l (o~-i\M
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改进后的归并排序: y_,bu^+*
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package org.rut.util.algorithm.support; z:O8Ls^\T
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import org.rut.util.algorithm.SortUtil; )oZ dj`
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/** *p d@.|^)m
* @author treeroot 6!o1XQr=Z
* @since 2006-2-2 }H4RR}g
* @version 1.0 %O<BfIZ
*/ Cx"sw
}
public class ImprovedMergeSort implements SortUtil.Sort { xno\s.H%]
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private static final int THRESHOLD = 10; _F{C\}
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/* a*;b^Ze`v
* (non-Javadoc) t^HRgY'NjM
* =Qq+4F)MD
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Ac6=(B
*/ Vl]>u+YqE
public void sort(int[] data) { 'qi}|I
int[] temp=new int[data.length]; G3]4A&h9v~
mergeSort(data,temp,0,data.length-1); 0(Ij%Wi,
} i4Jc.8^9$
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private void mergeSort(int[] data, int[] temp, int l, int r) { B!yr!DWv
int i, j, k; X]=t>
int mid = (l + r) / 2; |{;G2G1[
if (l == r) d-m7}2c
return; K,]=6Rj
if ((mid - l) >= THRESHOLD) l%ZhA=TKQ
mergeSort(data, temp, l, mid); tkhCw/
else !wNO8;(
insertSort(data, l, mid - l + 1); l2d{ 73h
if ((r - mid) > THRESHOLD) ToQ"Iy?
mergeSort(data, temp, mid + 1, r); u-TUuP
else wzaV;ac4K
insertSort(data, mid + 1, r - mid); ,Q,^3*HX9}
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for (i = l; i <= mid; i++) { hph4 `{T
temp = data; h![#;>(
} f?b"i A(6
for (j = 1; j <= r - mid; j++) { >7r!~+B"9'
temp[r - j + 1] = data[j + mid]; ,[Fb[#Qqb
} l,:F
int a = temp[l]; Q&&@v4L
int b = temp[r]; m*;ERK
for (i = l, j = r, k = l; k <= r; k++) { v:p} B$
if (a < b) { g>sSS8RO
data[k] = temp[i++]; z2c6T.1M
a = temp; z~Q)/d,Ac
} else { *A< 5*Db:F
data[k] = temp[j--]; ckn~#UE=
b = temp[j]; }Lv;!
} 9l,oP?
} n(Uyz`qE
} :4s1CC+@\
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/** 1}37Q&2
* @param data M;NX:mX9
* @param l 6RM/GM
* @param i Ie^l~Gb
*/ f5k6`7Vj]
private void insertSort(int[] data, int start, int len) { =EIkD9u
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); $N\Ja*g
} mTh]PPo
} zJXplvaL;
} [Yyk0Qv|4
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}