归并排序: y`RzcXblIZ
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package org.rut.util.algorithm.support; AQZ<,TE0,
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import org.rut.util.algorithm.SortUtil; ]q"&V\b
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/** .{ v$;g
* @author treeroot SXw r$)4_
* @since 2006-2-2 k3bQ32()
* @version 1.0 6!_Wo\_%
*/ 5&8E{YXr
public class MergeSort implements SortUtil.Sort{ {N~mDUoJ|
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/* (non-Javadoc) LtRRX@qJw
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) m%L!eR
*/ /MtmO$.
public void sort(int[] data) { [~N;d9H+*1
int[] temp=new int[data.length]; <);q,|eh2
mergeSort(data,temp,0,data.length-1); W^iK9|[qp
} -jJhiaJ$<
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private void mergeSort(int[] data,int[] temp,int l,int r){ ^{"i eVn
int mid=(l+r)/2; eC5*Q=ai,
if(l==r) return ; ZSu.0|0#
mergeSort(data,temp,l,mid); vYRY?~8 C
mergeSort(data,temp,mid+1,r); P3Ql[2
for(int i=l;i<=r;i++){ cH&)Iz`f
temp=data; -H%v6E%yh
} a{ST4d'T
int i1=l; (}b~}X9
int i2=mid+1; g!^N#o
for(int cur=l;cur<=r;cur++){ ~IZ-:?+S^
if(i1==mid+1) I<2`wL=
data[cur]=temp[i2++]; 7RT{RE
else if(i2>r) w>2lG3H<
data[cur]=temp[i1++]; ]y{tMC
else if(temp[i1] data[cur]=temp[i1++]; :lai0>
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else 2E40&
data[cur]=temp[i2++]; p8,=K<
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} ~m=GS[=
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改进后的归并排序: v:SHaUS
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package org.rut.util.algorithm.support; [h-6;.e
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import org.rut.util.algorithm.SortUtil; {v*4mT
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/** !EIH"`>!
* @author treeroot P"NI> HM
* @since 2006-2-2 +jE)kaV%
* @version 1.0 %R$)bGT
*/ /D"T\KNWr
public class ImprovedMergeSort implements SortUtil.Sort { im*sSz 0 (
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private static final int THRESHOLD = 10; "\*)KH`C
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/* 3.YH7rN
* (non-Javadoc) | +;ZC y
* DG;u_6;JR
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) :kHk'.V1(
*/ lH3.q4D
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public void sort(int[] data) { -=lm`X<:
int[] temp=new int[data.length]; /6rjGc
mergeSort(data,temp,0,data.length-1); XI`_PQco
} a >fA-@
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private void mergeSort(int[] data, int[] temp, int l, int r) {
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int i, j, k; c&T5C,]
int mid = (l + r) / 2; MNs<yQ9I'
if (l == r) ai;!Q%B#Q
return; l]|&j`'O
if ((mid - l) >= THRESHOLD) bpsyO>lx/
mergeSort(data, temp, l, mid); G5qsnTxUJ
else {b- C,J
insertSort(data, l, mid - l + 1); 6Y [&1c8
if ((r - mid) > THRESHOLD) s>;"bzzq
mergeSort(data, temp, mid + 1, r); oRd{?I&NY
else >*!T`P}p
insertSort(data, mid + 1, r - mid); @Xoh@:j\
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for (i = l; i <= mid; i++) { No\#N/1@P
temp = data; ( &m1*
} 5tv*uz|fv
for (j = 1; j <= r - mid; j++) { GYw/KT~$
temp[r - j + 1] = data[j + mid]; u|23M,
} 8!v|`Ky
int a = temp[l]; `x=kb;
int b = temp[r]; tgBA(2/Co
for (i = l, j = r, k = l; k <= r; k++) { n^QDMyC;I
if (a < b) { m@nGXl'!
data[k] = temp[i++]; fyUW;dj
a = temp; qF3S\
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} else { M}jl\{
data[k] = temp[j--]; ^Whc<>|
b = temp[j]; `T[yyOL/
} [vtDtwL
} ?bd!JW bg`
} <;i&-,
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/** B#."cg4VR
* @param data C|}yE;*a
* @param l ' q9Ejig
* @param i ]Q^8
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*/ '_g&!zi8~
private void insertSort(int[] data, int start, int len) { R&s/s`pLW
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Jur$O,u40l
} 0D:uM$
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} @uC-dXA"
} aJm5`az)
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}