归并排序: bjuYA/w<
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package org.rut.util.algorithm.support; u
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import org.rut.util.algorithm.SortUtil; -FQC9~rR;g
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/** p^T&jE8])#
* @author treeroot eLCdAr
* @since 2006-2-2 ll^Th >
* @version 1.0 =AWX
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*/ H0: iYHu
public class MergeSort implements SortUtil.Sort{ np<f,
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/* (non-Javadoc) E~'q?LJOB
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1,m\Q_
*/ kJHr&=VO~
public void sort(int[] data) { U*
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int[] temp=new int[data.length]; `2Wl
mergeSort(data,temp,0,data.length-1); }9{dR4hD
} hfJrQhmE
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private void mergeSort(int[] data,int[] temp,int l,int r){ h=uiC&B
int mid=(l+r)/2; _cW_u?0X:
if(l==r) return ; GwTT+
mergeSort(data,temp,l,mid); ^`l"'6
mergeSort(data,temp,mid+1,r); {
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for(int i=l;i<=r;i++){ Hlz'a1\:O]
temp=data; pw0Px
} |Dl*w/n
int i1=l; }@3Ud'
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int i2=mid+1; w%>aR_G
for(int cur=l;cur<=r;cur++){ 5x:Ift
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if(i1==mid+1) p>2||
data[cur]=temp[i2++]; j)g_*\tQ
else if(i2>r) i58ZV`Rk`
data[cur]=temp[i1++]; 5W*7qD[m
else if(temp[i1] data[cur]=temp[i1++]; F% F
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else K<$wz/\
data[cur]=temp[i2++]; It#h p,@e
} !F=|*j
} &p/S>qKu#
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} SQ1M4:hP
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改进后的归并排序: 2#>$%[
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package org.rut.util.algorithm.support; o?:;8]sr!
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import org.rut.util.algorithm.SortUtil; `,F&y{A
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/** =gxgS<bde
* @author treeroot vGx?m@
* @since 2006-2-2 #G'S
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* @version 1.0 BSx j~pun
*/ AyQS4A.s[
public class ImprovedMergeSort implements SortUtil.Sort { 4M;sD;3
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private static final int THRESHOLD = 10; Tns?mQ
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/* o0,UXBx
* (non-Javadoc) C><<0VhU
* *(?U
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) u=p ;A1oy
*/ ]_^"|RJ
public void sort(int[] data) { aukk|/3Ih
int[] temp=new int[data.length]; w.4u=e >Z4
mergeSort(data,temp,0,data.length-1); \zk?$'d
} r1[E{Tpz
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private void mergeSort(int[] data, int[] temp, int l, int r) { GM)\)\kNF
int i, j, k; 3::3r}g
int mid = (l + r) / 2; -/(DPx
if (l == r) !Iw{Y'
return; {]t\`fjrg
if ((mid - l) >= THRESHOLD) )GiFkG
mergeSort(data, temp, l, mid); p)?qJ2c|
else C m,*bgX
insertSort(data, l, mid - l + 1); ltCwns
if ((r - mid) > THRESHOLD) %8}WX@SB
mergeSort(data, temp, mid + 1, r); ua]\xBWx
else YtwmlIar`
insertSort(data, mid + 1, r - mid); \Dvl%:8
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for (i = l; i <= mid; i++) { W~XV
temp = data; 4kW30Ma
} wx]+*Lzz
for (j = 1; j <= r - mid; j++) { c,#~L7
temp[r - j + 1] = data[j + mid]; J~_L4*Jw
} }m=tzHB*
int a = temp[l]; p56KS5duI.
int b = temp[r]; )bB"12Z|8
for (i = l, j = r, k = l; k <= r; k++) { g|&.v2 '
if (a < b) { J8sJ~FnUj
data[k] = temp[i++]; J6*\>N5W
a = temp; u4b3bH9U
} else { LY@1@O2@
data[k] = temp[j--]; 9TYw@o5V
b = temp[j]; ]p4`7@@)*
} #}[Sj-Vp
} ql#{=oGDnA
} >,w\lf9
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/** A%NK0j$;}
* @param data 1M%{Uqsd -
* @param l 1S*8v 7
* @param i w>NZRP_3
*/ p6&LZ=tL3
private void insertSort(int[] data, int start, int len) { hYP6z^
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); SeRK7Q&_
} w%i+>\tO
} X_-Hrp!h
}
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}