归并排序: Z-p^3t'{
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package org.rut.util.algorithm.support; 6exlb:
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import org.rut.util.algorithm.SortUtil; p*&LEjaVM4
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/** MLIQ 8=
* @author treeroot O>F.Wf5g
* @since 2006-2-2 [Z Gj7
* @version 1.0 Cg\)BHv~
*/ ];}|h|q/{}
public class MergeSort implements SortUtil.Sort{ /sC[5G%
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/* (non-Javadoc) Joo)GIB
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <C`eZ}Qqv
*/ r|F,\fF
public void sort(int[] data) { >E,L"&_j
int[] temp=new int[data.length]; BHE =Zo
mergeSort(data,temp,0,data.length-1); np>!lF:
} dvWlx]'
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private void mergeSort(int[] data,int[] temp,int l,int r){ (X7yNIPfA
int mid=(l+r)/2; HY| SLk/E
if(l==r) return ; ,Y5 4(>>%
mergeSort(data,temp,l,mid); #<>E+r+
mergeSort(data,temp,mid+1,r); 5'Ay@FJ:
for(int i=l;i<=r;i++){ qlT:9*&g
temp=data; ]~M{@h!<
} 257;@;
int i1=l; i R5soIR
int i2=mid+1; E|uXi)!.x
for(int cur=l;cur<=r;cur++){ \*"0wR;[K
if(i1==mid+1) vHe.+XY
data[cur]=temp[i2++]; F"#*8P
else if(i2>r) WIlS^?5I<
data[cur]=temp[i1++]; J& SuUh<
else if(temp[i1] data[cur]=temp[i1++]; z}N^`_ *
else &J@ZF<Ib
data[cur]=temp[i2++]; yWk:u 5
} C)^\?DH
} h?tV>x/Fu
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} vgZPDf|
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改进后的归并排序: 0 S8{VZpy
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package org.rut.util.algorithm.support; ^a 5~FI:
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import org.rut.util.algorithm.SortUtil; &'2l_b
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/** Z:gsguX
* @author treeroot ywtDz8!^u
* @since 2006-2-2 +Ws}a
* @version 1.0 EMH}VigR
*/ yXl.Gq>]{
public class ImprovedMergeSort implements SortUtil.Sort { s/^=WV
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private static final int THRESHOLD = 10; h4xdE0
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/* XxQ2g&USk
* (non-Javadoc) =,Um;hU3r
* a#**96Av
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^o<Nz8
*/ F+^[8zK^
public void sort(int[] data) { a2)*tbM9\
int[] temp=new int[data.length]; t$D[,$G9
mergeSort(data,temp,0,data.length-1); ]>!_OCe&
} V0B4<TTAo~
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private void mergeSort(int[] data, int[] temp, int l, int r) { ]V\g$@
int i, j, k; j*\MUR=
int mid = (l + r) / 2; NPq2C8:
if (l == r) oYm"NDS_.
return; $k=rd#3
if ((mid - l) >= THRESHOLD) Du4?n8 o
mergeSort(data, temp, l, mid); -/*{^[
else ViONG]F
insertSort(data, l, mid - l + 1); ;yoq/
if ((r - mid) > THRESHOLD) r2`?Ta
mergeSort(data, temp, mid + 1, r); |EU08b]P29
else wC@U/?
insertSort(data, mid + 1, r - mid); aa3YtNpP
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for (i = l; i <= mid; i++) { qo![#s
temp = data; Fd0FG A&L
} ,FPgs0rrS
for (j = 1; j <= r - mid; j++) { cW>`Z:6{K
temp[r - j + 1] = data[j + mid]; ~$Yuxo
} p`C5jfI
int a = temp[l]; 05DtU!3O
int b = temp[r]; ]sIFK
for (i = l, j = r, k = l; k <= r; k++) { ]z@]Fi33Y
if (a < b) { R|yTUGY
data[k] = temp[i++]; I*t}gvUt9
a = temp; _J`M>W)8
} else { '7%9Sqx
data[k] = temp[j--]; Jx,s.Z0@7,
b = temp[j]; -O6o^Dk
} 8;bOw
} s@9#hjv2
} 5PySCGv
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/** 3 g!h4?^
* @param data {<Zqw]
* @param l P|4a}SWU
* @param i 3*L,48wX
*/ 'c]&{-w<i
private void insertSort(int[] data, int start, int len) { z#ET-[I
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); /;J;,G`?
} ? -tw *2+
} iWsIc\!+,
} Oms`i&}"}
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}