归并排序: `7zz&f9dDX
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package org.rut.util.algorithm.support; 7?:7}xb-
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import org.rut.util.algorithm.SortUtil; WoHFt*e2
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/** 9[N+x2q
* @author treeroot lX/6u
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* @since 2006-2-2 -ve{O-;
* @version 1.0 :vz_f$=
*/ g4cmYg3
public class MergeSort implements SortUtil.Sort{ *z!!zRh3x
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/* (non-Javadoc) 2-Y%W(bEzs
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) f^@`[MJj1C
*/ oj /:
public void sort(int[] data) { 3@kiUbq7Eu
int[] temp=new int[data.length]; ]&`_5pS
mergeSort(data,temp,0,data.length-1); H[#s&Fk2
} I8;pMr6
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private void mergeSort(int[] data,int[] temp,int l,int r){ GJ edW
int mid=(l+r)/2; ~'2)E/IeV
if(l==r) return ; :?2+'+%'
mergeSort(data,temp,l,mid); `c ~Va/Yi
mergeSort(data,temp,mid+1,r); TMj(y{2
for(int i=l;i<=r;i++){ ]X?~Cz/wl
temp=data; % <
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} OM*N) *
int i1=l; ;Y5"[C9|
int i2=mid+1; _Il/ i&
for(int cur=l;cur<=r;cur++){ .9_]8T
if(i1==mid+1) 3/+9#
data[cur]=temp[i2++]; QkBT,c
else if(i2>r) .|}ogTEf
data[cur]=temp[i1++]; PdcF
else if(temp[i1] data[cur]=temp[i1++]; RbKAB8
else `d2}>
data[cur]=temp[i2++]; )eop:!m
} }\k"azQ`
} *Nloa/a&9
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} HUiW#x%;
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改进后的归并排序: 2qLRcA=R
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package org.rut.util.algorithm.support; t33/QW
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import org.rut.util.algorithm.SortUtil; 'L4@|c~x
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/** t<mT=(zt*
* @author treeroot t$^1A1Ef
* @since 2006-2-2 Z[<rz6%cB
* @version 1.0 m:CiXM
*/ i$gm/ZO
public class ImprovedMergeSort implements SortUtil.Sort { &;S.1tg
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private static final int THRESHOLD = 10; c-.t8X,5(~
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/* pMnkh}Q#
* (non-Javadoc) h$.y)v
* KSU?Tg&JR
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) e0Cr> I5/e
*/ 9AK<<Mge.
public void sort(int[] data) { iD+Q\l;%
int[] temp=new int[data.length]; ":E
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mergeSort(data,temp,0,data.length-1); :M)B#@ c=
} /{Ksi+q
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private void mergeSort(int[] data, int[] temp, int l, int r) { *ci,;-*C
int i, j, k; ;S5*n:d
int mid = (l + r) / 2; h^h,4H\r
if (l == r) A@-nn]
return; xvOGE]n
if ((mid - l) >= THRESHOLD) j_Pt8{[
mergeSort(data, temp, l, mid); U?97yc\$
else ImO\X`{
insertSort(data, l, mid - l + 1); 3on]#/"1b
if ((r - mid) > THRESHOLD) 58)`1p\c'
mergeSort(data, temp, mid + 1, r); +U_> Bo
else 0PO'9#
insertSort(data, mid + 1, r - mid); [u\E*8
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for (i = l; i <= mid; i++) { 1Y!"C
temp = data; g BfYm
} &m2FEQLj
for (j = 1; j <= r - mid; j++) { MT9c:7}[&
temp[r - j + 1] = data[j + mid]; F`KA^ZI
} ,DsqKXSU
int a = temp[l]; !N:!x[5
int b = temp[r]; D{g6M>,\
for (i = l, j = r, k = l; k <= r; k++) { ]Tk3@jw+b
if (a < b) { UUi@
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data[k] = temp[i++]; 2 Pn
a = temp; /T&z
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} else { TD:NL4dm
data[k] = temp[j--]; l]D?S]{a
b = temp[j]; Q-o}Xnj*!L
} spter35b[
} ^*(*tS|M
} A.tONPi
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/** VL=. JwK
* @param data ;1PnbU b
* @param l _V\rs{
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* @param i !wy
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*/ ?RL[#d+y
private void insertSort(int[] data, int start, int len) { ):HjpJvF
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 4TcKs}z
} R{Q*"sf
} U5Say3r
} R&}"En`$s
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}