归并排序: iMSS8J
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package org.rut.util.algorithm.support; \6o
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import org.rut.util.algorithm.SortUtil; 8p5u1 ;2
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/** QS[%`-dR2
* @author treeroot n%Fa;!S
* @since 2006-2-2 \(Iy>L.
* @version 1.0 a}yJ$6xi
*/ {x+jFj.
public class MergeSort implements SortUtil.Sort{ %!@Dop/<
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/* (non-Javadoc) W];4P=/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) E7N1B*KI
*/ fgNEq
public void sort(int[] data) { D,2,4h!ka
int[] temp=new int[data.length]; \ZA%"F){
mergeSort(data,temp,0,data.length-1); |
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} qYE -z(i
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private void mergeSort(int[] data,int[] temp,int l,int r){ ~
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int mid=(l+r)/2; )Aj~ xA
if(l==r) return ; f@yST z;u
mergeSort(data,temp,l,mid); RtSk;U1
mergeSort(data,temp,mid+1,r); rHMsA|xz6
for(int i=l;i<=r;i++){ jYU#]
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temp=data; hHdC/mR
} yCwQ0|
int i1=l; |
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int i2=mid+1; +!X^E9ra
for(int cur=l;cur<=r;cur++){ sGV%O=9?2
if(i1==mid+1) GDk/85cv0$
data[cur]=temp[i2++]; X{)M}WO+r
else if(i2>r) 2D
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data[cur]=temp[i1++]; SgJQH7N
else if(temp[i1] data[cur]=temp[i1++]; [;c#LJ/y
else [Ga9^e$Zv
data[cur]=temp[i2++]; _9<Ko.GVq
} 3]wV`mD
} c1c0b|B!U
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改进后的归并排序: *-2u0 %
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package org.rut.util.algorithm.support; Fd2zvi
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import org.rut.util.algorithm.SortUtil; 7-)Y\D
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/** !x>P]j7A}Y
* @author treeroot <.Pr+g
* @since 2006-2-2 zF{5!b
* @version 1.0 $"sf%{~
*/ <jV_J+#
public class ImprovedMergeSort implements SortUtil.Sort { KnlVZn[3t
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private static final int THRESHOLD = 10; qUCiB}
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/* k*M1m'1
* (non-Javadoc) QQqWJq~
* i2EB.Zlv
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Y]P]^3
*/ Dk:Zeo]+my
public void sort(int[] data) { HdVGkv/
int[] temp=new int[data.length]; 6zyozJA
mergeSort(data,temp,0,data.length-1); 2&dtOyxo>
} )PZ'{S
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private void mergeSort(int[] data, int[] temp, int l, int r) { Kg9REL@,s
int i, j, k; LTrn$k3}
int mid = (l + r) / 2; O0wD"V^W
if (l == r) }nuhLt1
return; I( pU_7mw
if ((mid - l) >= THRESHOLD) P*G&pitT
mergeSort(data, temp, l, mid); kpEES{f
else $BCqz! 4K
insertSort(data, l, mid - l + 1); Si!W@Jm
if ((r - mid) > THRESHOLD) koe&7\ _@
mergeSort(data, temp, mid + 1, r); \3x,)~m
else QO0T<V
insertSort(data, mid + 1, r - mid); 6Vi #O^>
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for (i = l; i <= mid; i++) { 'R= r9_%
temp = data; -]HO8}-Rjs
} <Cm:4)~
for (j = 1; j <= r - mid; j++) { )t0t*xu#
temp[r - j + 1] = data[j + mid]; jRzR`>5
} eo"6 \3z
int a = temp[l]; l1a=r:WhH
int b = temp[r]; "h\{PoG
for (i = l, j = r, k = l; k <= r; k++) { JQ!D8Ut
if (a < b) { R|Y)ow51
data[k] = temp[i++]; Bx2E9/S3
a = temp; Q']:k}y
} else { e%#9|/uP
data[k] = temp[j--]; Bm1yBKjO
b = temp[j]; ,0;E_i7
} (',G
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} ;DBO
} o1QK@@}
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/** %=%jy
* @param data KR#Bj?fz-H
* @param l [p|-G*=00
* @param i Q lql(*
*/ $GPenQ~},
private void insertSort(int[] data, int start, int len) { DM"`If%3j
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); :U^a0s%B
} 4>gkXfTF
} a'rN&*P
} ^!!@O91T
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}