归并排序: lH}KFFbp
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package org.rut.util.algorithm.support; O`B,mgT(
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import org.rut.util.algorithm.SortUtil; {~3QBMx6
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/** [d: u(
* @author treeroot 0B}4$STOo[
* @since 2006-2-2 H$KO[mW}
* @version 1.0 K:wI'N"N
*/ Jsz!ro
public class MergeSort implements SortUtil.Sort{ Z!)~?<gcq:
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/* (non-Javadoc) 0NXH449I=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) mQj=-\p
*/ l4OrlS/ 5
public void sort(int[] data) { >]\I:T
int[] temp=new int[data.length]; c.ow4~>
mergeSort(data,temp,0,data.length-1); 5E&#Kh(I
} Z0F~?
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private void mergeSort(int[] data,int[] temp,int l,int r){ n0xGIq
int mid=(l+r)/2; Oynb"T&8
if(l==r) return ; `*C=R
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mergeSort(data,temp,l,mid); +$h
mergeSort(data,temp,mid+1,r); [_,as
for(int i=l;i<=r;i++){ *doNPp)m
temp=data; [9 W@<p
} nHseA
int i1=l; 3v/B*M VI
int i2=mid+1; OT9]{|7
for(int cur=l;cur<=r;cur++){ rtV`Q[E
if(i1==mid+1) KK){/I=z
data[cur]=temp[i2++]; Fx9-A8oIR
else if(i2>r) Q&} 0owe
data[cur]=temp[i1++]; L*6'u17y
else if(temp[i1] data[cur]=temp[i1++]; rbZbj#
else .%zcm
data[cur]=temp[i2++]; =V^-@ji)b
} l8\UO<^fY
} \|]mClj#
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改进后的归并排序: W>K^55'
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package org.rut.util.algorithm.support; rUiYR]mV
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import org.rut.util.algorithm.SortUtil; <ql,@*Y
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/** v}G^+-?
* @author treeroot g'8Y5x[
* @since 2006-2-2 w;z7vN~/O
* @version 1.0 |#oS7oV(
*/ a`xq
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public class ImprovedMergeSort implements SortUtil.Sort { !+l'<*8V
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private static final int THRESHOLD = 10;
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/* "-J5!y*,Y
* (non-Javadoc) 4&/CES
* JU 9GJ"
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 22gh!F%)
*/ j[>cv;h
;
public void sort(int[] data) { * {g3ia
int[] temp=new int[data.length]; 3H,E8>Vd
mergeSort(data,temp,0,data.length-1); jvzioFCt
} #36QO
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private void mergeSort(int[] data, int[] temp, int l, int r) { 34@ [ZKJ5
int i, j, k; 8v4}h9*F"7
int mid = (l + r) / 2; Sc)^k
if (l == r) _?{7%(C
return; JJ?{V:
if ((mid - l) >= THRESHOLD)
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mergeSort(data, temp, l, mid); C|'DKT4M&
else "yWw3(V2>
insertSort(data, l, mid - l + 1); PRKZg]?
if ((r - mid) > THRESHOLD) ex3Qbr
mergeSort(data, temp, mid + 1, r); 6TtB3;5
else La4S/.
insertSort(data, mid + 1, r - mid); v}B%:1P4
} M#e\neii
for (i = l; i <= mid; i++) { ,g*!NK_:5t
temp = data; S@qp_!
} +>$]leqa
for (j = 1; j <= r - mid; j++) { Q;h.}N8W
temp[r - j + 1] = data[j + mid]; _Nx
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} e#"h@kZP
int a = temp[l]; $|K
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int b = temp[r]; aeqz~z2~8s
for (i = l, j = r, k = l; k <= r; k++) { K1&
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if (a < b) { 1!#85SMx
data[k] = temp[i++]; d*(aue=
a = temp; SN{z)q
} else { Cux(v8=n
data[k] = temp[j--]; @u~S!(7.Wi
b = temp[j]; [$N_YcN?
} )*')
} I>c,Bo7
} k+<945kC
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/** u
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* @param data bJ^JK
* @param l \}j MC
* @param i _fAgp_)
*/ Z8$}Rpo
private void insertSort(int[] data, int start, int len) { +y7z>Fwl
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); %@$UIO,(
} 0I}e>]:I
} BZR{}Aj4pa
} 0[;2dc
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}