归并排序: >f'g0g
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package org.rut.util.algorithm.support; 5PW^j\G-f
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import org.rut.util.algorithm.SortUtil; c)tfAD(N8x
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/** <,(,jU)j
* @author treeroot KYP!Rs/j.
* @since 2006-2-2 e|9A716x
* @version 1.0 c"Sq~X
*/ p:%loDk
public class MergeSort implements SortUtil.Sort{ {iLT/i%
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/* (non-Javadoc) VD :/PL
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) qCO/?kW
*/ 2
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public void sort(int[] data) { 05k0n E
int[] temp=new int[data.length]; $A`VYJtt#
mergeSort(data,temp,0,data.length-1); fX+O[j
} 5Ph4<f` L~
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private void mergeSort(int[] data,int[] temp,int l,int r){ &=Wlaa/,&
int mid=(l+r)/2; KdlQ!5(?X
if(l==r) return ; LDD|(KLR*.
mergeSort(data,temp,l,mid); UDni]P!E
mergeSort(data,temp,mid+1,r); l+R+&b^
for(int i=l;i<=r;i++){ y Wya&|D9
temp=data; gO^gxJ'0t
} E!#WnSpnK
int i1=l; _y>~
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int i2=mid+1; /=, nGk>
for(int cur=l;cur<=r;cur++){ "vslZ`RU
if(i1==mid+1) Q|L~=9
data[cur]=temp[i2++]; wT\49DT"7
else if(i2>r) rD>f|kA?L
data[cur]=temp[i1++]; hL5|69E
else if(temp[i1] data[cur]=temp[i1++]; nLiY%x`S
else @vB!u[{
data[cur]=temp[i2++]; 3 9|MX21k
} &I406Z f7y
} Tqk\XILG N
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} F\KUZ[%
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改进后的归并排序: /SrAW`;"
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package org.rut.util.algorithm.support; 6DWgl$[[
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import org.rut.util.algorithm.SortUtil; Ki~1qu:
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/** O#u=c1
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* @author treeroot ,u
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* @since 2006-2-2 AFfAtu
* @version 1.0 0AV c
*/ \_U$"/$4VH
public class ImprovedMergeSort implements SortUtil.Sort { Z:7fV5b(
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private static final int THRESHOLD = 10; #!m.!?
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/* ;Q&5,<
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* (non-Javadoc) h65-s
* -Vhw^T1iV
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &=k,?TJO>
*/ =kqt
public void sort(int[] data) { :Lug7bUVD
int[] temp=new int[data.length];
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mergeSort(data,temp,0,data.length-1); Y)a^(!<H<
} evJ.<{M
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private void mergeSort(int[] data, int[] temp, int l, int r) { &yol_%C
int i, j, k; vI)LB)Q
int mid = (l + r) / 2; C{bgkzr
if (l == r) ,'iE;o{Tu
return;
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if ((mid - l) >= THRESHOLD) 8'r[te4,
mergeSort(data, temp, l, mid); PJ'E/C)i
else CsifKHI
insertSort(data, l, mid - l + 1); AnvRxb.e
if ((r - mid) > THRESHOLD) ff1c/c/
mergeSort(data, temp, mid + 1, r); ',4iFuY
else K!]/(V(}
insertSort(data, mid + 1, r - mid); *r% c
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for (i = l; i <= mid; i++) { ivz5H(b
temp = data; -[DOe?T
} "v4B5:bmqW
for (j = 1; j <= r - mid; j++) { @jlw_ob2g
temp[r - j + 1] = data[j + mid]; bNoW?8bZ
} z%LIX^q9
int a = temp[l]; HgkC~'
int b = temp[r]; E`k@{*Hn&
for (i = l, j = r, k = l; k <= r; k++) { 0k(a VkZ I
if (a < b) { A$xF$l
data[k] = temp[i++]; Bng@-#`/
a = temp; ")HFYqP>9
} else { -8rjgB~."/
data[k] = temp[j--]; /_#q@r4ZQ
b = temp[j]; fe#\TNeQJ[
} q\527^ZM
} @[i4^
} Q( {
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/** h.s+)fl\
* @param data _M5|Y@XN-
* @param l 3CGp`~Zf
* @param i gy9U2Wgf|
*/ 0|\$Vp
private void insertSort(int[] data, int start, int len) { #3 pb(fbw
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); =+MPFhvg!
} Y~E`9
} m&?r%x
} 1"M]3Kl
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}