归并排序: j=4>In?x
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package org.rut.util.algorithm.support; sJ=B:3jS0
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import org.rut.util.algorithm.SortUtil; wl9icrR>
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/** Bw[V K7
* @author treeroot r>o6}Mx$
* @since 2006-2-2 Vo[4\h#$
* @version 1.0 ,Nh X%
*/ RPwSo.c4
public class MergeSort implements SortUtil.Sort{ k=}hY+/=
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/* (non-Javadoc) 4+"SG@i`W
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) $la,_Sr
*/ Y.J$f<[R
public void sort(int[] data) { ~~mQ
int[] temp=new int[data.length]; (z{xd
mergeSort(data,temp,0,data.length-1); uyIA]OtyN
} , 88}5)b[
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private void mergeSort(int[] data,int[] temp,int l,int r){ ?=&*6H_v
int mid=(l+r)/2; =j-{Mxb3
if(l==r) return ; 3E-&8x7uYR
mergeSort(data,temp,l,mid); j/&7L@Y
mergeSort(data,temp,mid+1,r); 7dZ!GX?\y
for(int i=l;i<=r;i++){ Jjv&@a}
temp=data; 8wOPpdc
} wC~Uy%
int i1=l; 7
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int i2=mid+1; C.O-iBVe#
for(int cur=l;cur<=r;cur++){ 10(N|2'q
if(i1==mid+1) uQCS%|8C
data[cur]=temp[i2++]; ]LjW,b"
else if(i2>r) Re_.<_$
data[cur]=temp[i1++]; t|%ul6{gz
else if(temp[i1] data[cur]=temp[i1++]; PH.v3
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else Zlhr0itf
data[cur]=temp[i2++]; aoN[mV'
} [PT}!X7h
} gqd#rjtfz
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改进后的归并排序: 6*tGf`Pfdw
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package org.rut.util.algorithm.support; .E(Ucnz/
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import org.rut.util.algorithm.SortUtil; hE${eJQ| U
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/** zQ~nS
* @author treeroot TQE_zOa:
* @since 2006-2-2 S3w? X
* @version 1.0 lUmaNZ
*/ CAfG3;
public class ImprovedMergeSort implements SortUtil.Sort { :v`o="
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private static final int THRESHOLD = 10; 8}2
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*
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/* oID,PB*9
* (non-Javadoc) ZC"p^~U_e[
* c)?y3LX
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7o3f5"z
*/ *" wsMO
public void sort(int[] data) { NeH^g0Q2,g
int[] temp=new int[data.length]; GI/o!0"_
mergeSort(data,temp,0,data.length-1); 70@:!HI]
} bA:abO
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private void mergeSort(int[] data, int[] temp, int l, int r) { 0t8-oui
int i, j, k; [LE_lATjU
int mid = (l + r) / 2; 3$_wAt4w
if (l == r) Ktoxl+I?
return; L fhd02
if ((mid - l) >= THRESHOLD) %VgR *
mergeSort(data, temp, l, mid); r?{tBju^
else R/=yS7@{)
insertSort(data, l, mid - l + 1); zrcSPh
if ((r - mid) > THRESHOLD) 9"[#\TW9Vb
mergeSort(data, temp, mid + 1, r); hq|/XBd||
else :0/I2:
insertSort(data, mid + 1, r - mid); *`[LsG]ZF
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for (i = l; i <= mid; i++) { 5^qI6
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temp = data; WE\V<MGS/
} c(fwl`y!x
for (j = 1; j <= r - mid; j++) { %j
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temp[r - j + 1] = data[j + mid]; C.eZcNJG
} ,xGkE7=5
int a = temp[l]; FKPI{l
int b = temp[r]; 9kcAMk1K
for (i = l, j = r, k = l; k <= r; k++) { EyhQjsaT
if (a < b) { -70Ut
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data[k] = temp[i++]; .M04n\
a = temp; >Tw|SK+3
} else { |X>:"?4t
data[k] = temp[j--]; 5bk5EE`
b = temp[j]; x@yF|8
} SKGYmleR
} gqE{
} @l 1 piz8
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/** \%UA6uj
* @param data JHcC}+H[
* @param l vb# d%1b5
* @param i UhNeY{6
*/ f -bVcWI
private void insertSort(int[] data, int start, int len) { Xcb\N
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); {C
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} [!"u&iu`
} fU,sn5zZ
} l78zS'
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}