归并排序: Dd-;;Y1C
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package org.rut.util.algorithm.support; nm'sub
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import org.rut.util.algorithm.SortUtil; 6vbWe@#U/
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/** A[oLV"J6x5
* @author treeroot W$B&asO
* @since 2006-2-2 *;"N kCf
* @version 1.0 |s-q+q{|
*/ }__g\?Yf
public class MergeSort implements SortUtil.Sort{ !rZO~a0
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/* (non-Javadoc) (~:k70V5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) T]Gxf"mK
*/ C)~YWx@v
public void sort(int[] data) { XKp.]c wP
int[] temp=new int[data.length]; "u~l+aW0
mergeSort(data,temp,0,data.length-1); Tf7$PSupP
}
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private void mergeSort(int[] data,int[] temp,int l,int r){ BIEc4k5(
int mid=(l+r)/2; J~eY,n.6]
if(l==r) return ; jb~a z
mergeSort(data,temp,l,mid); BF@(`D&>
mergeSort(data,temp,mid+1,r); blNE$X+0|
for(int i=l;i<=r;i++){ \HLI
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temp=data; 9!b,!#=
} (f#QETiV
int i1=l; )SQ*"X4"
int i2=mid+1; ?BT\)@h
for(int cur=l;cur<=r;cur++){ +6|Ys
if(i1==mid+1) Vc.A<(
data[cur]=temp[i2++]; Sj]k5(&
else if(i2>r) pJrc\`D
data[cur]=temp[i1++]; z~Ph=1O>p
else if(temp[i1] data[cur]=temp[i1++]; X0O0Y>"
else L]hXAShmb
data[cur]=temp[i2++]; ML'4 2z
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} rUEoz |e4a
} DeE-M"
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} gYVk5d|8@4
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改进后的归并排序: s\i=-`
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package org.rut.util.algorithm.support; iwWy]V m7
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import org.rut.util.algorithm.SortUtil; `,i'vb`W#b
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/** zvf:*Na")
* @author treeroot ;F9<Yv
* @since 2006-2-2 b}S}OW2
* @version 1.0 #mlTN3
*/ Zq=t&$*
public class ImprovedMergeSort implements SortUtil.Sort { Ug_5INK
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private static final int THRESHOLD = 10; FL% GW:
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/* ?jbE3fW
* (non-Javadoc) *(YtO
* Yr@_X
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }dw`[{cm
*/ z"*X/T
public void sort(int[] data) { :_JZn`Cab
int[] temp=new int[data.length]; IG0$OtG
mergeSort(data,temp,0,data.length-1); :VP4|H#SP
} })!d4EcZf
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private void mergeSort(int[] data, int[] temp, int l, int r) { /AV
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int i, j, k; c|3%0=,`
int mid = (l + r) / 2; s:lar4>kM
if (l == r) ]vJZ v"ACn
return; ljVtFm<
if ((mid - l) >= THRESHOLD)
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mergeSort(data, temp, l, mid); -Bbg'=QZa
else t5mI)u
insertSort(data, l, mid - l + 1); vK6YU9W~J
if ((r - mid) > THRESHOLD) t1?e$s
mergeSort(data, temp, mid + 1, r); r7Bv?M^!
else `)e;bLP
insertSort(data, mid + 1, r - mid); |7]7~ 6l
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for (i = l; i <= mid; i++) { 'Bb]<L`
temp = data; fiOc;d8
} J01w\#62pQ
for (j = 1; j <= r - mid; j++) { 7)$U>|=
temp[r - j + 1] = data[j + mid]; ";}Lf1M9
} Vd3'dq8/?
int a = temp[l]; l%\3'N]
int b = temp[r]; }uo5rB5D
for (i = l, j = r, k = l; k <= r; k++) { s
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if (a < b) { o0$R|/>i
data[k] = temp[i++]; o6sL~*hQ
a = temp; V&vU her0
} else { <h|XB}s+
data[k] = temp[j--]; VTk6.5!8
b = temp[j]; u':-DgK
} <HM\ZDo@P
} +jYO?uaT
} 8^M5k%P
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/** (A O]f fBU
* @param data ,/6V ^K
* @param l /Y5I0Ko Uw
* @param i ,{:c<W:A]
*/ 8(3'YNC
private void insertSort(int[] data, int start, int len) { ~fw 6sY#
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); HmKvu"3
} pxjN\q
} 5x?eun
} (UDF^
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}