归并排序: s9a`2Wm
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package org.rut.util.algorithm.support; qJ(uak
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import org.rut.util.algorithm.SortUtil; AT+l%%
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/** tq~4W% p/
* @author treeroot ~nhO*bs}7{
* @since 2006-2-2 j~1K(=Ng
* @version 1.0 !yPy@eP~
*/ OdZ/ \_Z
public class MergeSort implements SortUtil.Sort{ u<uc"KY=
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/* (non-Javadoc) Sir1>YEm
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) k2$pcR,WM
*/ fkp(M
public void sort(int[] data) { QNINn>2
int[] temp=new int[data.length]; ['Lo8 [
mergeSort(data,temp,0,data.length-1); &Z[+V)6,,
} #h^nvRmON
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private void mergeSort(int[] data,int[] temp,int l,int r){ p<(a);<L
int mid=(l+r)/2; @'}2xw[eU
if(l==r) return ; ]7cciob
mergeSort(data,temp,l,mid); .%{B=_7
mergeSort(data,temp,mid+1,r); ?4U4o<
for(int i=l;i<=r;i++){ S*=^I2;
temp=data; LdH1sHy*d`
} S9P({iZK
int i1=l; oJ
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int i2=mid+1; >qB`03>
for(int cur=l;cur<=r;cur++){ ULxQyY;32
if(i1==mid+1) =DfI^$Lr:
data[cur]=temp[i2++]; zN!yOlp5
else if(i2>r) ,hu@V\SKv
data[cur]=temp[i1++]; HZ%V>88
else if(temp[i1] data[cur]=temp[i1++]; wkGr}
else u &1M(~Ub=
data[cur]=temp[i2++]; i8k} B
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} fMFkA(Of^
} 2F`#df
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改进后的归并排序: L=qhb;[L
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package org.rut.util.algorithm.support; m jP
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import org.rut.util.algorithm.SortUtil; w-ald?`
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/** &WBpd}|+Y
* @author treeroot &! h~UZ
* @since 2006-2-2 )L6
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* @version 1.0
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*/ M&V4|D
public class ImprovedMergeSort implements SortUtil.Sort { M j[+h|e
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private static final int THRESHOLD = 10; "lu^
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/* L`K)mCr
* (non-Javadoc) 0.wF2!V.
* D((/fT)eD
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6Aqv*<1=62
*/ -XL?n/M
public void sort(int[] data) { =23B9WT
int[] temp=new int[data.length]; KTT!P 4
mergeSort(data,temp,0,data.length-1); BM:p)%Pv#P
} Y\_mqd
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private void mergeSort(int[] data, int[] temp, int l, int r) { F/lL1nTdK
int i, j, k; {'A
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int mid = (l + r) / 2; JUA%l
if (l == r) M !"Q7>d
return; [dP<A?s
if ((mid - l) >= THRESHOLD) ]Xnar:5
mergeSort(data, temp, l, mid); ;kZD>G8
else 8A]8yX =
insertSort(data, l, mid - l + 1); 0'r}]Mws
if ((r - mid) > THRESHOLD) >S`=~4
mergeSort(data, temp, mid + 1, r); @w= =*.x
else *(q{k%/M
insertSort(data, mid + 1, r - mid); 5OGwOZAj52
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for (i = l; i <= mid; i++) { !gRU;ZQU_
temp = data; M5+R8ttc
} =/|GWQj
for (j = 1; j <= r - mid; j++) { hlV(jz
temp[r - j + 1] = data[j + mid]; *8a[M{-X
} =v\}y+
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int a = temp[l]; /_cpSq
int b = temp[r]; 2& Hl
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for (i = l, j = r, k = l; k <= r; k++) { UdkNb}L
if (a < b) { N)E'k%?,
data[k] = temp[i++]; W%ix|R^2]
a = temp; g~K-'Nw
} else { bt=D<YZk
data[k] = temp[j--]; mD +9/O!
b = temp[j]; $<Gt^3e
} EB+4]MsD
} bHSoQ \
} 9<CUm"%J
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/** ~P,Z@|c4
* @param data n~`jUML2d
* @param l xP1D 9
* @param i aMydeTCHi
*/ K6B6@
private void insertSort(int[] data, int start, int len) { s!YX<V
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 7SkW!5
} ,:}VbQ:3I
} MJe/ \
} cqh1,h$sG
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}