归并排序: x0q`Uc
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package org.rut.util.algorithm.support; sTi3x)#xB
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import org.rut.util.algorithm.SortUtil; *47%|bf`
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/** FF30VlJ
* @author treeroot /I0}(;^y
* @since 2006-2-2 %nj{eT
* @version 1.0 <\?dPRw2>
*/ z s[zB#
public class MergeSort implements SortUtil.Sort{ I$I',x5Z
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/* (non-Javadoc) F^7qr
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ],f%:
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*/ FW"gj\
public void sort(int[] data) { ? UBE0C
int[] temp=new int[data.length]; 5Yx
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mergeSort(data,temp,0,data.length-1); 257q%"
} ->&amPv
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private void mergeSort(int[] data,int[] temp,int l,int r){ ^FK-e;J
int mid=(l+r)/2; EA<x$O
if(l==r) return ; NO.5Vy
mergeSort(data,temp,l,mid); h
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mergeSort(data,temp,mid+1,r); ?"T *{8
for(int i=l;i<=r;i++){ Cvtz&dH
temp=data; iZ2nBiQ
} R|!4klb
int i1=l; N-Sjd%Z
int i2=mid+1; (.9H1aO46|
for(int cur=l;cur<=r;cur++){ jp#/]>(9Z
if(i1==mid+1) 3x
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data[cur]=temp[i2++]; NMhI0Ix$w
else if(i2>r) *6]_ 6xO
data[cur]=temp[i1++]; [vcSt5R=
else if(temp[i1] data[cur]=temp[i1++]; uSNlI78D
else 4,7W*mr3(
data[cur]=temp[i2++]; `FIS2sl/
} tL
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改进后的归并排序: r-c1_
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package org.rut.util.algorithm.support; r%` |kN
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import org.rut.util.algorithm.SortUtil; 5m
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/** Ly`FU)
* @author treeroot WizVw&Iv
* @since 2006-2-2 v'u}%FC
* @version 1.0 XM?C7/^k
*/ 3qrjb]E%}
public class ImprovedMergeSort implements SortUtil.Sort { a*Ng+~5)6
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private static final int THRESHOLD = 10; Yq-7!
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/* :X#'ELo|
* (non-Javadoc) vN`JP`IBx
* $Q*^c"&
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +ZPn[|
*/ >SHW
public void sort(int[] data) { =_,j89E
int[] temp=new int[data.length]; E3h-?ugO'
mergeSort(data,temp,0,data.length-1); 3 bll9Ey
} *vIC9./
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private void mergeSort(int[] data, int[] temp, int l, int r) { uE,j$d
int i, j, k; "o$)z'q
int mid = (l + r) / 2; p!2t/XIM
if (l == r) tcj3x<
return; 3Cl&1K #5
if ((mid - l) >= THRESHOLD) 420yaw/":
mergeSort(data, temp, l, mid); 3("E5lI(g:
else NPE7AdB8
insertSort(data, l, mid - l + 1); K7]IAV
if ((r - mid) > THRESHOLD) {@T<eb$d
mergeSort(data, temp, mid + 1, r); >D*%1LH~V
else ,HfdiGs}j
insertSort(data, mid + 1, r - mid); @ R;o $n
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for (i = l; i <= mid; i++) { ]gB:ht
temp = data; qiyJ4^1
} Pxe7 \e
for (j = 1; j <= r - mid; j++) { LkUi^1((e
temp[r - j + 1] = data[j + mid]; qwHP8GU
} [35>T3Ku
int a = temp[l]; 'V(9ein^Q
int b = temp[r]; xs$-^FnD
for (i = l, j = r, k = l; k <= r; k++) { [fr!J?/@
if (a < b) { Ky6 d{|H
data[k] = temp[i++]; t%]b`ad
a = temp; rb<9/z5-
} else { 6B`,^8Lp
data[k] = temp[j--]; A,! YXl[
b = temp[j]; k= oCpXq^
} Ln&CB!u
} td\'BV
} I8{ohFFo
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/** a3[lZPQe
* @param data $h8,QPy
* @param l h&:6S
* @param i .Sjg
*/ WO"<s{v
private void insertSort(int[] data, int start, int len) { V?o%0V
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Hrj@I?4
} F)hUT@
} 8Hh=Sp^
} 1c}LX.9 K
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}