归并排序: r@t9Ci=}
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package org.rut.util.algorithm.support; Xi,CV[L\
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import org.rut.util.algorithm.SortUtil; :^WKT
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/** ~8P!XAU56%
* @author treeroot z(Pe,zES
* @since 2006-2-2 .e=:RkI,
* @version 1.0 p,>5\Zre~
*/ L`p4->C9A
public class MergeSort implements SortUtil.Sort{ D rHVG
*%fi/bimG
/* (non-Javadoc) v>Yb/{A
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <[\`qX
*/ v|%Z+w
public void sort(int[] data) { '~[d=fwH
int[] temp=new int[data.length]; Vjp1RWb
mergeSort(data,temp,0,data.length-1); vV6I0
} jW3!6*93
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private void mergeSort(int[] data,int[] temp,int l,int r){ eWtZ]kB
int mid=(l+r)/2; -vR5BMy=
if(l==r) return ; J|kR5'?x
mergeSort(data,temp,l,mid); ()Y4v
mergeSort(data,temp,mid+1,r); TKY*`?ct
for(int i=l;i<=r;i++){ wKYZa# u
temp=data; KB`!Sj\
} q6SXWT'Sa
int i1=l; NS%xTLow-
int i2=mid+1; I E&!YP(U(
for(int cur=l;cur<=r;cur++){ Vp*KfS]
if(i1==mid+1) v99B7VH4
data[cur]=temp[i2++]; uRRQyZ
else if(i2>r) ,PuL{%PXu
data[cur]=temp[i1++]; r1.nTO%
else if(temp[i1] data[cur]=temp[i1++]; zHL@i0>^
else 'y2nN=CN
data[cur]=temp[i2++]; PQnF
} q[`]D7W
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} 6[LM_eP
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改进后的归并排序: K/b_22]CC
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package org.rut.util.algorithm.support; eg?<mKrZ
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import org.rut.util.algorithm.SortUtil; P'*)\faw
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/** KJ=6 n%6
* @author treeroot ^xHTW g%9
* @since 2006-2-2 v'qG26
* @version 1.0 jR22t`4
*/ ^ZhG>L*
public class ImprovedMergeSort implements SortUtil.Sort { fA<[f
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private static final int THRESHOLD = 10; 8a="/J
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/* i;jw\ed
* (non-Javadoc) u7[ykyV
* QP)pgAc
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %Nhx;{
*/ ,TPISs
public void sort(int[] data) { g[Ib,la_a
int[] temp=new int[data.length]; ang~<
mergeSort(data,temp,0,data.length-1); Xr2ou5zAn
} .DR<Te
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private void mergeSort(int[] data, int[] temp, int l, int r) { Y/ee~^YxK'
int i, j, k; `m?c;,\
int mid = (l + r) / 2; qT"Q1xU[
if (l == r) Bck7\
return; m~Bl*`~M
if ((mid - l) >= THRESHOLD) }L3 oR
mergeSort(data, temp, l, mid); jJY"{foWV
else f3{MvAy[
insertSort(data, l, mid - l + 1); :Jy'#c
if ((r - mid) > THRESHOLD) C] 9p5Hs
mergeSort(data, temp, mid + 1, r); *R3f{/DK
else *@Y3oh}S
insertSort(data, mid + 1, r - mid); 6s\Kt3=
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for (i = l; i <= mid; i++) { 7J|VD#DE$Y
temp = data; 0-|byAh
} /yF QeE
for (j = 1; j <= r - mid; j++) { 2Sp=rI
temp[r - j + 1] = data[j + mid]; pN9A{v(
} %8Dzo
int a = temp[l]; a{J,~2>
int b = temp[r]; Eam
for (i = l, j = r, k = l; k <= r; k++) { }_;!hdYq
if (a < b) { g'=B%eO$j:
data[k] = temp[i++]; .I'o
a = temp; c`WHNky%j
} else { R~jHr
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data[k] = temp[j--]; IS[thbzkZ
b = temp[j]; ./D$dbu3
} w@c87;c
} UkHY[M7;
} rEv*)W
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/** ~J8pnTY
* @param data i|}[A
* @param l psC
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* @param i f=!VsR2o
*/ ,FMx5$
private void insertSort(int[] data, int start, int len) { z=_Ef3`M
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); }gMDXy}
} 7&"n`@(.!
} Ru>uL@w
} R8UYP=Kp
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}