归并排序: -p>1:M <
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package org.rut.util.algorithm.support; *,*O.#<6
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import org.rut.util.algorithm.SortUtil; T{"Ur:p
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/** g;nLR<]
* @author treeroot BGwD{6`U
* @since 2006-2-2 ~UNha/nt
* @version 1.0 2k^rZ^^"
*/ n00J21
public class MergeSort implements SortUtil.Sort{ 'gg<)Bd
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/* (non-Javadoc) "19#{yX4
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) uozq^sy
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public void sort(int[] data) { J:&.[
int[] temp=new int[data.length]; ]j6K3
mergeSort(data,temp,0,data.length-1); n ]D io
} '<uM\v^k
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private void mergeSort(int[] data,int[] temp,int l,int r){ BmccSC;o4
int mid=(l+r)/2; U=69q]
if(l==r) return ; F'|e:h
mergeSort(data,temp,l,mid); q1x[hv3
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mergeSort(data,temp,mid+1,r); WG,1%=M@
for(int i=l;i<=r;i++){ G
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} -$0}rfX
int i1=l; 1r}i[5
int i2=mid+1; h$6'9rL&i
for(int cur=l;cur<=r;cur++){ Kl%[f jI)
if(i1==mid+1) n8_X<jIp3
data[cur]=temp[i2++];
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else if(i2>r) v~T)g"_|
data[cur]=temp[i1++]; Ka-o$o[^u`
else if(temp[i1] data[cur]=temp[i1++]; <#nU 06 fN
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data[cur]=temp[i2++]; yUpN`;
} ipp`9 9
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改进后的归并排序: knG:6tQ
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package org.rut.util.algorithm.support; R8u8jG(4
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import org.rut.util.algorithm.SortUtil; \ moLQ
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/** 2)|=+DN;
* @author treeroot 5CN=a2&
* @since 2006-2-2 y] D\i5Xv
* @version 1.0 wzwv>@}
*/ XE<5(
public class ImprovedMergeSort implements SortUtil.Sort { (:`4*xK
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private static final int THRESHOLD = 10; f~a
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/* ,
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* (non-Javadoc) ov,
* UR_Ty59
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Y 'X!T8
*/ gAsmPI.K
public void sort(int[] data) { R$
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int[] temp=new int[data.length]; h~Z &L2V
mergeSort(data,temp,0,data.length-1); >W-xDzJry
} i*mU<:t
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private void mergeSort(int[] data, int[] temp, int l, int r) { =UK:83R(
int i, j, k; s-Yu(X2
int mid = (l + r) / 2; E.NfVeq
if (l == r) _zM?"16I}
return; )z74,n7-
if ((mid - l) >= THRESHOLD) t855|
mergeSort(data, temp, l, mid); H.{Fw j4
else e\[q3J
insertSort(data, l, mid - l + 1); SWI\;:k
if ((r - mid) > THRESHOLD) :KX*j$5U
mergeSort(data, temp, mid + 1, r); Ji!i}UjD7!
else (EWGX |QA
insertSort(data, mid + 1, r - mid); KP0(w(q
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for (i = l; i <= mid; i++) { R+uZi~
temp = data; W[)HFh(#
} i7h^L)M
for (j = 1; j <= r - mid; j++) { _('
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temp[r - j + 1] = data[j + mid]; s-WZ3g
} !]uB4
int a = temp[l]; w)vpo/?
int b = temp[r]; DIQ30(MS
for (i = l, j = r, k = l; k <= r; k++) { cW0\f5[/
if (a < b) { L7rr/D
data[k] = temp[i++]; 8h|} Q _
a = temp; uQ[,^Ee&/
} else { -wC}JVVcK
data[k] = temp[j--]; Y_y!$jd(N
b = temp[j]; m)<+?Bv y
} }E(w@&
} i.On{nB"k
} oO?+2pTQV
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/** 5,f`5'$
* @param data ET9tn1
* @param l |-/@3gPO
* @param i v
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*/ Q
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private void insertSort(int[] data, int start, int len) {
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for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 5D7 L)>
} DcaKGjp
} RLQ*&[A}
} _I'k&R
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}