归并排序: 7=o2$
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package org.rut.util.algorithm.support; P p}N-me>_
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import org.rut.util.algorithm.SortUtil; ~+y0UEtq7
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/** )>! IY Q
* @author treeroot Qe~2'Hw#9
* @since 2006-2-2 W[dMf!(
* @version 1.0 Dm3/i|Y
*/ B>^5h?(lt
public class MergeSort implements SortUtil.Sort{ cI5*`LML1
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/* (non-Javadoc) #$vef
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) U2 tsHm.O
*/ x bG'![OX
public void sort(int[] data) { ~N i#xa
int[] temp=new int[data.length]; H3#xBn>9
mergeSort(data,temp,0,data.length-1); A/ eZ!"Y
} [":[\D'
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private void mergeSort(int[] data,int[] temp,int l,int r){ &wZ ggp
int mid=(l+r)/2; ,|: a7b]
if(l==r) return ; 8e'0AI_>
mergeSort(data,temp,l,mid); [\h k_(}
mergeSort(data,temp,mid+1,r); S=Ihg
for(int i=l;i<=r;i++){ b&$ ?.z
temp=data; dBV^Khf J
} (3RU|4Ks
int i1=l; ;%1ob f 89
int i2=mid+1; 3^LSK7.:
for(int cur=l;cur<=r;cur++){ 9`8\<a'rU
if(i1==mid+1) $ {$XJs4
data[cur]=temp[i2++]; u}QB-oU
else if(i2>r) w"CcWng1
data[cur]=temp[i1++]; 6~b~[gA
else if(temp[i1] data[cur]=temp[i1++]; 9<An^lLK*
else Nk-biD/J
data[cur]=temp[i2++]; /H)K_H#|;
} w8t,?dY
} gTK5z.]
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} Yx_[vLm
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改进后的归并排序: +$ )C KC
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package org.rut.util.algorithm.support; _tfZg /+)
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import org.rut.util.algorithm.SortUtil; /j]r?KAzw
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/** *G^n<p$"
* @author treeroot 1#AdEd[
* @since 2006-2-2 e`Xy!@`_
* @version 1.0 R
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*/ khl(9R4a
public class ImprovedMergeSort implements SortUtil.Sort { |Xblz1>DF
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private static final int THRESHOLD = 10; 4z-sR/ d
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/* -ob_]CKtJ~
* (non-Javadoc) s-eC' )w~E
* \?[#>L4
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _=Y]ZX`j
*/ ,P^pDrc
public void sort(int[] data) { UA[2R1}d
int[] temp=new int[data.length]; ?)#dP8n
mergeSort(data,temp,0,data.length-1); P>=~\v nN#
} Fzk
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private void mergeSort(int[] data, int[] temp, int l, int r) { J/j1Yf'9
int i, j, k; %t0Fx
int mid = (l + r) / 2; lgZ3=h
if (l == r) sk~rjH]-g$
return; ^*C+^l&J!
if ((mid - l) >= THRESHOLD) ?H7*? HV
mergeSort(data, temp, l, mid); rE"`q1b#
else p(MhDS\J
insertSort(data, l, mid - l + 1); C
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if ((r - mid) > THRESHOLD) Q3#-q>;7
mergeSort(data, temp, mid + 1, r); W|@EK E.k
else yy4QY%
insertSort(data, mid + 1, r - mid); "U34D1I)#
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for (i = l; i <= mid; i++) { =+q9R`!L]
temp = data; P}o:WI4.cB
} CjM+%l0MW
for (j = 1; j <= r - mid; j++) { m~~_iz_*
temp[r - j + 1] = data[j + mid]; DO(-)izC
} ~=HN30
int a = temp[l]; vV1F|
int b = temp[r]; ]]$s"F<
for (i = l, j = r, k = l; k <= r; k++) { ~$>l@> xX
if (a < b) { nMD^x
data[k] = temp[i++]; SF 61rm
a = temp; k,M%/AXd
} else { @L^2VVWk^
data[k] = temp[j--]; B:5(sK
b = temp[j]; g^(wZ$NH
} C>Qgd9
} cj-P&D[Ny[
} i]*Wt8~!
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/** o=?sM q1<
* @param data 7/NXb
* @param l aksyr$d0V<
* @param i `CW8Wj
*/ PJN TIa
private void insertSort(int[] data, int start, int len) { XF(I$Mxl6
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); T%K(opISc(
} VO>A+vx3M
} 7f#[+i
} _*6nTSL
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}