归并排序: ';hU&D;s
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package org.rut.util.algorithm.support; $/Gvz)M
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import org.rut.util.algorithm.SortUtil; >E|@3g
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/** zu5'Ex`gQa
* @author treeroot T(MS,AyD]
* @since 2006-2-2 Sav]Kxq{
* @version 1.0 M")J buI
*/ @ H=
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public class MergeSort implements SortUtil.Sort{ am{f<v,EI
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/* (non-Javadoc) =SB#rCH
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) h8Q+fHDYv
*/ X]U,`oE)9
public void sort(int[] data) { Q g"hN
int[] temp=new int[data.length]; ;gYW!rM
mergeSort(data,temp,0,data.length-1); =MEv{9_
} 5DK>4H:
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private void mergeSort(int[] data,int[] temp,int l,int r){ K:Wxx"
int mid=(l+r)/2; i6?,2\K
if(l==r) return ; L@HPU;<
mergeSort(data,temp,l,mid); l_hM,]T0
mergeSort(data,temp,mid+1,r); P,k~! F^L
for(int i=l;i<=r;i++){ _7'9omq@
temp=data; 8*!<,k="9
} mTz %;+|L
int i1=l; ]|it&4l
int i2=mid+1; Tz4,lwuWX7
for(int cur=l;cur<=r;cur++){ J0*hJ-/u
if(i1==mid+1) iZ<^p1i
data[cur]=temp[i2++]; "CLoM\M)
else if(i2>r) X^ckTIdR
data[cur]=temp[i1++]; 8W#/=Xh?
else if(temp[i1] data[cur]=temp[i1++]; ?:vp3f#
else y >r7(qg
data[cur]=temp[i2++]; n$
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} lqn7$
} {a\O7$A\F
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} |iKk'Rta4
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改进后的归并排序: >A5R
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package org.rut.util.algorithm.support; ^hzlR[
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import org.rut.util.algorithm.SortUtil; $h`(toTyF
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/** T$T:~8tK3
* @author treeroot k!3X4;F!_
* @since 2006-2-2 |t+M/C0y/
* @version 1.0 g6{.C7m
*/ 9] fhH
public class ImprovedMergeSort implements SortUtil.Sort { M(|Qvh{Q6
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private static final int THRESHOLD = 10; 1j0OV9 -|
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/* zs
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* (non-Javadoc) %KHO}gad1
* o(w!x!["
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) k4fc5P
*/ .)
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public void sort(int[] data) { BZejqDr*
int[] temp=new int[data.length]; |z\5Ik!fF]
mergeSort(data,temp,0,data.length-1); |x@)%QeC
} 7[h_"@_A7
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private void mergeSort(int[] data, int[] temp, int l, int r) { &[:MTK?x!
int i, j, k; ;Pf
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int mid = (l + r) / 2; sd9$4k"
if (l == r) gNF8&T
return; F1) B-wW
if ((mid - l) >= THRESHOLD) vQ/}E@?u
mergeSort(data, temp, l, mid); PLU8:H@X
else nlmc/1C
insertSort(data, l, mid - l + 1); bP\0S@1YL
if ((r - mid) > THRESHOLD) A'r 3%mC
mergeSort(data, temp, mid + 1, r); E9z^# @s
else qzS 9ls>>
insertSort(data, mid + 1, r - mid); CF"$&+ s9
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for (i = l; i <= mid; i++) { K~ ,|~
temp = data; )]WWx-Uf'
} 5I/wP qR[
for (j = 1; j <= r - mid; j++) { x2x)y08
temp[r - j + 1] = data[j + mid]; 1{l18B`
} Ri4t/H
int a = temp[l]; kR$>G2$!
int b = temp[r]; Wt5x*p-!C
for (i = l, j = r, k = l; k <= r; k++) { 0zm)MSg
if (a < b) { |$"2R3
data[k] = temp[i++]; nX4R
a = temp; S$J}>a#Ry
} else { Xou1X$$z
data[k] = temp[j--]; [p[nK=&r
b = temp[j]; j(^ot001%v
} (Cjnf
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} ^7MhnA
} &7Frg`B&:
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/** \$:KfN>WY
* @param data D`p&`]k3v
* @param l ?~~sOf AP
* @param i w}+#w8hu
*/ x{4Rm,Dxn
private void insertSort(int[] data, int start, int len) { GslUN% UJr
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); NbOeF7cq+
} j1_ E^
} \{r-e
} Ft%HWGE
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}