归并排序: 2/N*Uk 0
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package org.rut.util.algorithm.support; P;/wb/
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import org.rut.util.algorithm.SortUtil; DN0b.*[`3
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/** L4Y3\4xXO
* @author treeroot dV
* @since 2006-2-2 IomJo
* @version 1.0 #vwXx r
*/ kovzB]
public class MergeSort implements SortUtil.Sort{ ;>Qd )'
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/* (non-Javadoc) BQg]$Tr?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) gP%!
*/ @!O{>`
public void sort(int[] data) { e/\_F+jyc
int[] temp=new int[data.length]; r0bPaAKw
mergeSort(data,temp,0,data.length-1); T
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} >vy+U
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private void mergeSort(int[] data,int[] temp,int l,int r){ dq(L1y870
int mid=(l+r)/2; =(\!,S'
if(l==r) return ; 4=:eGlU93U
mergeSort(data,temp,l,mid); @1Lc`;Wd
mergeSort(data,temp,mid+1,r); >f8,YisH
for(int i=l;i<=r;i++){ !2I wuru
temp=data; ?\r3
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} }`FPe
int i1=l; 7?] p\`
int i2=mid+1; ob
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for(int cur=l;cur<=r;cur++){ tpK4 gjf
if(i1==mid+1) #ySx$WT;
data[cur]=temp[i2++]; Z+7S,M
else if(i2>r) [.,6~=}vP
data[cur]=temp[i1++]; -y<uAI g
else if(temp[i1] data[cur]=temp[i1++]; 4gENV{L
else x0GZ2*vfsb
data[cur]=temp[i2++]; bf(&N-"A
} tYa8I/HpT
} 0MPDD%TP
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} 0n=E.qZ9c
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改进后的归并排序: yG4MqR)J
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package org.rut.util.algorithm.support; "Fiv
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import org.rut.util.algorithm.SortUtil; k({8C`&tK/
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/** gK#w$s50
* @author treeroot 8ipLq`)
* @since 2006-2-2 [NcOk,
* @version 1.0
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*/ 1[]cMyV
public class ImprovedMergeSort implements SortUtil.Sort { DUr1s]+P
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private static final int THRESHOLD = 10; Wz]S+IpY
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/* K e8cfd~c
* (non-Javadoc) $n"Llw&)
* L+L9)8FJ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) V
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*/ )`^:G3w
public void sort(int[] data) { {5JXg9um
int[] temp=new int[data.length]; C-Z,L#
mergeSort(data,temp,0,data.length-1); 6 -}gqkR
} *93 N0m4Rl
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private void mergeSort(int[] data, int[] temp, int l, int r) { _T$\$v$ {
int i, j, k; T-TH.
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int mid = (l + r) / 2; 1-#tx*>AY
if (l == r) tS7u#YMh
return; 3F1Z$d(
if ((mid - l) >= THRESHOLD) KK6YA
mergeSort(data, temp, l, mid); }o4Cd$,8
else M<Mr (z
insertSort(data, l, mid - l + 1); !:5n
if ((r - mid) > THRESHOLD) ]u ';zJ.
mergeSort(data, temp, mid + 1, r); ]'q<wPi
else YBP{4Rl
insertSort(data, mid + 1, r - mid); pxj"<q`nw8
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for (i = l; i <= mid; i++) { /slML~$t<
temp = data; 9@06]EI_
} ,R+u%bmn#
for (j = 1; j <= r - mid; j++) { =F4}
temp[r - j + 1] = data[j + mid]; 1F|+4
} UsTPNQj
int a = temp[l];
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int b = temp[r]; 9D,&)6
for (i = l, j = r, k = l; k <= r; k++) { Up&q#vqIj
if (a < b) { y(k2p
data[k] = temp[i++]; |=POV]K
a = temp; PR+!CFi&
} else { p* @L1
data[k] = temp[j--]; i`~y%y
b = temp[j]; q}jf&xUWzH
} $((<le5-)
} ZE^de(Fm
} p98lu'?@
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/** UL/>t}AG
* @param data P7b2I=t
* @param l ,o)MiR9-[A
* @param i ,n*.Yq
*/ ?HY0@XILI
private void insertSort(int[] data, int start, int len) { dQ[lXV[}v
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); *u}):8=&R
} HD ~9EK~
} pK4)>q
} _OY ;SJ(
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}