归并排序: &R siVBA
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package org.rut.util.algorithm.support; ]~%6JJN7
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import org.rut.util.algorithm.SortUtil; K>9 ()XT)
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/** >MK98(F
* @author treeroot {U1m.30n
* @since 2006-2-2 *J{+1Ev~$p
* @version 1.0 l]cFqLp
*/ to\Ni~a&
public class MergeSort implements SortUtil.Sort{ CJ%I51F`X
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/* (non-Javadoc) x :7IIvP
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) {|\.i
*/ _wOt39e&
public void sort(int[] data) { KF/-wZ"1s
int[] temp=new int[data.length]; bxWa oWE0
mergeSort(data,temp,0,data.length-1); +O5hH8<&b
} 7Qsgys#/=
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private void mergeSort(int[] data,int[] temp,int l,int r){ SzRmF1<
int mid=(l+r)/2; ? q&T$8zc4
if(l==r) return ; Gy)@Is9
mergeSort(data,temp,l,mid); '2O\_Uz
mergeSort(data,temp,mid+1,r); p8Q1-T3v
for(int i=l;i<=r;i++){ Gc!x|V;T
temp=data; hEk$d.!}
} ZN6Z~SL_i~
int i1=l; };g"GNy
int i2=mid+1; iI>A *,{,`
for(int cur=l;cur<=r;cur++){ Jo}eeJ;k
if(i1==mid+1) vFsLY
data[cur]=temp[i2++]; o14cwb
else if(i2>r) 4 OX^(
data[cur]=temp[i1++]; _
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else if(temp[i1] data[cur]=temp[i1++]; # [a*rD%m
else fzA9'i`
data[cur]=temp[i2++]; X jX2]
} xKC[=E>z
} yEoV[K8k
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} W%)Y#C
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改进后的归并排序: cAc@n6[`3
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package org.rut.util.algorithm.support; NCx%L-GPi
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import org.rut.util.algorithm.SortUtil; wf$s*|z
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/** :yjFQ9^?&
* @author treeroot ;GhNKPY
* @since 2006-2-2 7)k\{&+P
* @version 1.0 km40qO@3
*/ }{"fJ3] c^
public class ImprovedMergeSort implements SortUtil.Sort { @K]|K]cby
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private static final int THRESHOLD = 10; :lzrgsW
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/* JG,%qFlk
* (non-Javadoc) MWL%
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* 9mFE?J
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 63A.@mL
*/ X$pJ
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public void sort(int[] data) { 7=DdrG<
int[] temp=new int[data.length]; >U3cTEs cj
mergeSort(data,temp,0,data.length-1); RGU\h[
} r4f~z$QK
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private void mergeSort(int[] data, int[] temp, int l, int r) { rt|7h>RQ
int i, j, k; ^KELKv,_
int mid = (l + r) / 2; &w~d_</
if (l == r) FE{FGMq
return; LDg?'y;2
if ((mid - l) >= THRESHOLD) LrK,_)r:~
mergeSort(data, temp, l, mid); T5:G$-qL(
else l \?c}7k
insertSort(data, l, mid - l + 1); B+0hzkPY
if ((r - mid) > THRESHOLD) hG:|9Sol,
mergeSort(data, temp, mid + 1, r); j w9b)
else \j)E5b+
insertSort(data, mid + 1, r - mid); I9Fr5p-%O
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for (i = l; i <= mid; i++) { n}77##+R&C
temp = data; 2dzrRH
} A= {UL
for (j = 1; j <= r - mid; j++) { p6WX9\qS(
temp[r - j + 1] = data[j + mid]; 6i*sm.SDw
} 4,0{7MLgK
int a = temp[l]; ;Q&5,<
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int b = temp[r]; h65-s
for (i = l, j = r, k = l; k <= r; k++) { -Vhw^T1iV
if (a < b) { &=k,?TJO>
data[k] = temp[i++]; =kqt
a = temp; :Lug7bUVD
} else {
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data[k] = temp[j--]; Y)a^(!<H<
b = temp[j]; _]*>*XfF(
} vA.MRu#
} Zr,VR-kW+
} +&"zU GTIc
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/** Uv~QUL3>
* @param data T"}vAG( .O
* @param l ^<-+@v*
* @param i zNuJj L
*/ t!\tF[9e
private void insertSort(int[] data, int start, int len) { XF_pN[}
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); lUiL\~Gq
} /[>sf[X\I9
} T${Q.zHY[!
} N{~YJ$!8
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}