归并排序: `ZYoA
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package org.rut.util.algorithm.support; "O3tq=Q
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import org.rut.util.algorithm.SortUtil; iT3BF"ZqBO
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/** tdBm
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* @author treeroot N
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* @since 2006-2-2 y" RF;KW>
* @version 1.0 [8 ]z|bM
*/ @\0ez<.p}
public class MergeSort implements SortUtil.Sort{ bnf'4PAt
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/* (non-Javadoc) +Vb.lH[av
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) LDgrR[
*/ naG=Pq<
public void sort(int[] data) { ?+@n3]`0
int[] temp=new int[data.length]; Lb:g4A"
mergeSort(data,temp,0,data.length-1); qeV fE_<
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private void mergeSort(int[] data,int[] temp,int l,int r){ >JHryS.j$4
int mid=(l+r)/2; j4gF;-m<
if(l==r) return ; -$,TMqM
mergeSort(data,temp,l,mid); 1H?
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mergeSort(data,temp,mid+1,r); I| w"/"U
for(int i=l;i<=r;i++){ Gw/Pk4R
temp=data; S 6@u@C
} 4KhV|#-;k
int i1=l; _mqL8ho
int i2=mid+1; )B"jF>9)[
for(int cur=l;cur<=r;cur++){ LO9=xGj.
if(i1==mid+1) cLpYW7vZ[
data[cur]=temp[i2++]; ~7*.6YnI
else if(i2>r) 6iVxc|Ia
data[cur]=temp[i1++]; !JHL\M>A5
else if(temp[i1] data[cur]=temp[i1++]; Ra)3+M!x
else Y2N>HK0
data[cur]=temp[i2++]; ?PuBa`zDE
} '}ptj@,
} \=VtHu92=
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改进后的归并排序: #++lg{
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package org.rut.util.algorithm.support; R1adWBD>
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import org.rut.util.algorithm.SortUtil; 132{#tG]
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/** ZQ4p(6a
* @author treeroot %aG5F}S2~
* @since 2006-2-2 v|XTr,#
* @version 1.0 ]l_\71
*/ =)0,#9k U]
public class ImprovedMergeSort implements SortUtil.Sort { }NHaCG[,
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private static final int THRESHOLD = 10; mitHT :%r2
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/* <GS^
* (non-Javadoc) |s7s6k)mm
* t6bV?nc
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) LM:vsG
*/ BRw .]&/
public void sort(int[] data) { y`<*U;xL
int[] temp=new int[data.length]; gh/EU/~d
mergeSort(data,temp,0,data.length-1); a@_4PWzF:
} ~8'sBT
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private void mergeSort(int[] data, int[] temp, int l, int r) { 1!xQ=DU"
int i, j, k; ,Xu-@br{
int mid = (l + r) / 2; ne>pOK<vZ
if (l == r) Nyku4r0
return; (yH'{6g\
if ((mid - l) >= THRESHOLD) [^WC lRF
mergeSort(data, temp, l, mid); $SlIr<'*"
else v [wb~uw\
insertSort(data, l, mid - l + 1); :}He\V
if ((r - mid) > THRESHOLD) 9P1OP Xv*p
mergeSort(data, temp, mid + 1, r); (!ux+K
else nHM~
insertSort(data, mid + 1, r - mid); :(/~:^!
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for (i = l; i <= mid; i++) { b.2aHu( 3
temp = data; "3X2VFwoJ
} VACQ+
for (j = 1; j <= r - mid; j++) { &|s0P
temp[r - j + 1] = data[j + mid]; lUOF4U&r
} [T8WThs
int a = temp[l]; F%@A6'c
int b = temp[r]; E-T)*`e
for (i = l, j = r, k = l; k <= r; k++) { u4t7Ie*Q
if (a < b) { kYzIp
data[k] = temp[i++]; iw3FA4{(
a = temp; >nJ\BPx
} else { F~,Mw8
data[k] = temp[j--]; %R}qg6dL
b = temp[j]; W>${zVu
} %^?fMeI|Y
} Y@;CF
} &C`Gg<
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/** M1k{t%M+S
* @param data Kr?TxhUHd
* @param l F6|TP.VY_.
* @param i 4GkWRu1
*/ C'>|J9~Gz
private void insertSort(int[] data, int start, int len) { !S$:*5=&
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 8v:T.o;<
} %"q9:{m
} S ^!n45l
} DBo%fYst
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}