归并排序: .5!t:FPOv
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package org.rut.util.algorithm.support; @,XSs
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import org.rut.util.algorithm.SortUtil; ![f ![l
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/** +{]xtQB=,{
* @author treeroot H~ u[3LQz
* @since 2006-2-2 wW>)(&!F
* @version 1.0 w\}?( uO
*/ >[6{LAe~hp
public class MergeSort implements SortUtil.Sort{ ?bw4~
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/* (non-Javadoc) Xv@SxS-5l
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) L4L2O7
*/ r]ShZBAbYp
public void sort(int[] data) { U.{l;EL:T
int[] temp=new int[data.length]; 6ksAc%|5
mergeSort(data,temp,0,data.length-1); I}2P>)K
} )!tK[K?5
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private void mergeSort(int[] data,int[] temp,int l,int r){ F ]O$(7*
int mid=(l+r)/2; Su 5>$
if(l==r) return ; Pl-5ncb\
mergeSort(data,temp,l,mid); ?uMQP NYs
mergeSort(data,temp,mid+1,r); {D g_?._d
for(int i=l;i<=r;i++){ HHjt/gc}`
temp=data; l1]p'Liuu
} s}onsC
int i1=l; dJ?XPo"Cm=
int i2=mid+1;
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for(int cur=l;cur<=r;cur++){ cQ:"-!ff
if(i1==mid+1) gT/@dVV
data[cur]=temp[i2++]; n[YEOkiG
else if(i2>r) yz2Ci0Dwy
data[cur]=temp[i1++]; :iR \%
else if(temp[i1] data[cur]=temp[i1++]; ~8aJ S,u
else X0*QV- RN
data[cur]=temp[i2++]; ps$7bN C
} LK"
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改进后的归并排序: Z/rTVAs@r
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package org.rut.util.algorithm.support; "n:{!1VGw
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import org.rut.util.algorithm.SortUtil; c%*($)#
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/** OGiV{9U
* @author treeroot lnGq :-
* @since 2006-2-2 %P;Q|v6/|
* @version 1.0
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*/ 0q\7C[R_
public class ImprovedMergeSort implements SortUtil.Sort { `"@ X.}\
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private static final int THRESHOLD = 10; A8A~!2V
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/* @Mvd'.r<;
* (non-Javadoc) i
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* A[WV'!A,
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) |#l=
*/ e4FM} z[
public void sort(int[] data) { 1y^K/.5-
int[] temp=new int[data.length]; #y|V|nd
mergeSort(data,temp,0,data.length-1); d3^OEwe
} rw)kAe31
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private void mergeSort(int[] data, int[] temp, int l, int r) { '&;yT[
int i, j, k; `MP|Ovns:H
int mid = (l + r) / 2; kX:tc
if (l == r) n]+W 3[i
return; 9;%CHb&
if ((mid - l) >= THRESHOLD) *c[2C
mergeSort(data, temp, l, mid); S]sk7
else {2`=qt2
insertSort(data, l, mid - l + 1); }6 5s'JB
if ((r - mid) > THRESHOLD) 63?)K s
mergeSort(data, temp, mid + 1, r); :Sg_tOf
else p
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insertSort(data, mid + 1, r - mid); (wmBjQ]B<
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for (i = l; i <= mid; i++) { 9{j66
temp = data; c.\O/N
} U=sh[W
for (j = 1; j <= r - mid; j++) { i~J;G#b
temp[r - j + 1] = data[j + mid]; YGc^h(d
} ^% Q|s#w.
int a = temp[l]; h;lirvO|
int b = temp[r]; *b}>cn)<v
for (i = l, j = r, k = l; k <= r; k++) { (yo;NKq,@
if (a < b) { <ktzT&A
data[k] = temp[i++]; 4;`Bj:.
a = temp; j\RpO'+}
} else { Pag63njg?
data[k] = temp[j--]; a'\By?V]
b = temp[j]; m\/(w_/?
} vhr+g 'tf
} }G$]LWgQx
} U-wLt(Y<
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/** "x'),
* @param data B@Nt`ky0*
* @param l h?\2_s
* @param i S~$'WA
*/ t<:D@J]a
private void insertSort(int[] data, int start, int len) { #0b&^QL
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); b4Y8N"hL%
} RnfXN)+P
} 6) \dBOz
} mxwdugr`
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}