归并排序: 7.g)_W{7}
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package org.rut.util.algorithm.support; =5=D)x~
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import org.rut.util.algorithm.SortUtil; 'D#iT}Vu
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/** DE"KbA0}
* @author treeroot EXn$ [K;
* @since 2006-2-2 *I,3,zO
* @version 1.0 8&snLOU
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*/ E/ %S0
public class MergeSort implements SortUtil.Sort{ U7O]g'BP
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/* (non-Javadoc) j$r .&,m
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) B198_T!
*/ ER,,K._?B
public void sort(int[] data) { +W|MAJtg
int[] temp=new int[data.length]; KY'"Mg^!
mergeSort(data,temp,0,data.length-1); /LMb~Hy,
} k<W n
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private void mergeSort(int[] data,int[] temp,int l,int r){ Jg#L8>p1
int mid=(l+r)/2; ^ei[#I
if(l==r) return ; nTrfbK@
mergeSort(data,temp,l,mid); <qZ"W6&&
mergeSort(data,temp,mid+1,r); Q|eRek
for(int i=l;i<=r;i++){ $tvGS6p>
temp=data; q@ !p
} +<&\*VR
int i1=l; Vlb L
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int i2=mid+1; _J^q|
for(int cur=l;cur<=r;cur++){ G#n99X@-
if(i1==mid+1) `L0aQ$'>z
data[cur]=temp[i2++]; DDxNqVVt4
else if(i2>r) <jdS0YT
data[cur]=temp[i1++]; &We1i&w
else if(temp[i1] data[cur]=temp[i1++]; u*_I7.}9
else UJ'
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data[cur]=temp[i2++]; - bL
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} +o&E)S}wP
} VU,\OOp
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} [{3WHS.
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改进后的归并排序: $$C5Q;7w!
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package org.rut.util.algorithm.support; \ZrLh,6f.
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import org.rut.util.algorithm.SortUtil; m(JFlO
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/** /_~b~3{u
* @author treeroot 'Rk~bAX
* @since 2006-2-2 !ZP1?l30
* @version 1.0 |u8hxa
*/ X;_0"g
public class ImprovedMergeSort implements SortUtil.Sort { c)Ft#vzg&e
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private static final int THRESHOLD = 10; rN#ydw:9
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/* PZ69aZ*Gs
* (non-Javadoc) t!^FWr&
* [;B_ENV
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) g3{)AX[Uy
*/ e
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public void sort(int[] data) { rN?
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int[] temp=new int[data.length]; bu"Jb4_a>
mergeSort(data,temp,0,data.length-1); N]cGJU>$
} Y+N^_2@+C
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private void mergeSort(int[] data, int[] temp, int l, int r) { ~D@pk>I
int i, j, k; )CS7>Vx
int mid = (l + r) / 2; h`&@>uEiq
if (l == r) N^|r.J
return; U@[P.y~J
if ((mid - l) >= THRESHOLD) 6$wS7Cu
mergeSort(data, temp, l, mid); j}8IT
else Q(m} Sr4
insertSort(data, l, mid - l + 1); G 8|[.n
if ((r - mid) > THRESHOLD) AG)N^yd
mergeSort(data, temp, mid + 1, r); [:$j<}UmB
else /b@0HL?
insertSort(data, mid + 1, r - mid); >K#Z]k
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for (i = l; i <= mid; i++) { !7J;h{3Uw
temp = data; Z91gAy^z<
} FM9b0qE
for (j = 1; j <= r - mid; j++) { W#'c6Hq2c
temp[r - j + 1] = data[j + mid];
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} b0LjNO@<
int a = temp[l]; OB3AZH$
int b = temp[r]; ><OdHRh@#
for (i = l, j = r, k = l; k <= r; k++) { z2t;!]"'l
if (a < b) { "Gcr1$xG8!
data[k] = temp[i++]; `(aU_r=
a = temp; 4,f[D9|:
} else { (]j*)~=V
data[k] = temp[j--]; Fy-nV%P
b = temp[j]; Sw#Ez-X
} x@.iDP@(
} qM@][]j:
} [$3Zid
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/** O60j C;{F
* @param data IgEg
* @param l 5WP[-J)
* @param i DLyHC=%{+h
*/ ;~z>GJox
private void insertSort(int[] data, int start, int len) { 8s8q`_.)(
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); uW;Uq=UN
} =B1t?("
} 4q@o4C<0
} b7v] g]*
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}