归并排序: m&c(N
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package org.rut.util.algorithm.support; 3sIM7WD?
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import org.rut.util.algorithm.SortUtil; JT_B@TO\
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/** B>21A9&
* @author treeroot `r$WInsDu
* @since 2006-2-2 UoT}m^ G
* @version 1.0 ITPpT
*/ JNCtsfd
public class MergeSort implements SortUtil.Sort{ &Y2P! \\2
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/* (non-Javadoc) ``CADiM:S
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -%$
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*/ OvG |=
public void sort(int[] data) { wA&)y>n-
int[] temp=new int[data.length]; RIx6& 7$
mergeSort(data,temp,0,data.length-1); iFchD\E*o
} k}qiIMdI
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private void mergeSort(int[] data,int[] temp,int l,int r){ 5ml}TSMu'
int mid=(l+r)/2; n:] 1^wX#
if(l==r) return ; |H@p^.;
mergeSort(data,temp,l,mid); glIIJ5d|,
mergeSort(data,temp,mid+1,r); IcA~f@
for(int i=l;i<=r;i++){ nL~
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temp=data; m(]IxI
} \,t<{p_Q
int i1=l; xGk4KcxKs
int i2=mid+1; H43D=N&
for(int cur=l;cur<=r;cur++){ ,6pH *b$
if(i1==mid+1) Xh!Pg)|E
data[cur]=temp[i2++]; 'mR+W{r
else if(i2>r) wajhFBJ
data[cur]=temp[i1++]; 1"PE@!]
else if(temp[i1] data[cur]=temp[i1++]; )C6 7qY[P
else 9F!&y-
data[cur]=temp[i2++]; E.9k%%X]
} |/Z)?
} :N:8O^D^<
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} H.K`#W&
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改进后的归并排序: F\72^,0
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package org.rut.util.algorithm.support; IbwRb
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import org.rut.util.algorithm.SortUtil; {mGWMv
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/** L<`g}iw
* @author treeroot C
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* @since 2006-2-2 KHiJOeLc
* @version 1.0 OO>2oH
*/ pBLO
public class ImprovedMergeSort implements SortUtil.Sort { *?Y6qalSy
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private static final int THRESHOLD = 10; ;O>fy:$'
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/* WQ`T'k#ESW
* (non-Javadoc) i(rY'o2 BN
* net9KX4\
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) px@\b]/
*/ i*j+<R@
public void sort(int[] data) { `h6W@ROb
int[] temp=new int[data.length]; INpub5
mergeSort(data,temp,0,data.length-1); 49GCj`As
} _r'M^=yx[
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private void mergeSort(int[] data, int[] temp, int l, int r) { {Wo7=aR
int i, j, k; 4pv:u:Z
int mid = (l + r) / 2; &.B6P|N'
if (l == r) IrC=9%pd$R
return; 3}Qh`+Yj]
if ((mid - l) >= THRESHOLD) K4~Ox
mergeSort(data, temp, l, mid); "dTXT
else 9f`Pi:*+/
insertSort(data, l, mid - l + 1); dW68lVWq_
if ((r - mid) > THRESHOLD) ]+P&Y:
mergeSort(data, temp, mid + 1, r); T(F8z5s5
else =ndKG5
insertSort(data, mid + 1, r - mid); ak[)+_k_
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for (i = l; i <= mid; i++) { O6]~5&8U.
temp = data; W[s>TDc`v
} EM}z-@A>
for (j = 1; j <= r - mid; j++) { ba13^;fm#
temp[r - j + 1] = data[j + mid]; H=C;g)R
} P+h&tXZn8
int a = temp[l]; =@o}
int b = temp[r]; 63=m11Z4
for (i = l, j = r, k = l; k <= r; k++) { 'o L8Z
if (a < b) { qzz'v
data[k] = temp[i++]; |#6Lcz7[
a = temp; P_U-R%f
} else { d9"4m>ymS
data[k] = temp[j--]; $}fA;BP
b = temp[j]; 2Fi*)\{
} ~l~g0J
} ): 6d_g{2
} {,=,0NQKn
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/** stPCw$@
* @param data r8rR _M{P
* @param l oV`sCr5%
* @param i \Z':hw
*/ se[};t:
private void insertSort(int[] data, int start, int len) { m@YLZ
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); r;z A `
} 5,C,q%2
} -wB AFr
} o*_ D
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}