归并排序: >C y
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package org.rut.util.algorithm.support; \s?OvqI:
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import org.rut.util.algorithm.SortUtil; !Rk1q&U5
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/** `l@[8H%aw
* @author treeroot "r @RDw
* @since 2006-2-2 r/1:!Vu(
* @version 1.0 gS4zX>rqe
*/ A`<#}~A
public class MergeSort implements SortUtil.Sort{ PxzeN6f
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/* (non-Javadoc) o0$R|/>i
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Uo v%12
*/ Be}e%Rk
public void sort(int[] data) { v ~.X
int[] temp=new int[data.length]; <h|XB}s+
mergeSort(data,temp,0,data.length-1); VTk6.5!8
} <J-bDcp
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private void mergeSort(int[] data,int[] temp,int l,int r){ &B^#?vmO
int mid=(l+r)/2; )#k*K9[@
if(l==r) return ; =BQM(mal
mergeSort(data,temp,l,mid); (A O]f fBU
mergeSort(data,temp,mid+1,r); ,/6V ^K
for(int i=l;i<=r;i++){ /Y5I0Ko Uw
temp=data; ,{:c<W:A]
} 8(3'YNC
int i1=l; ~fw 6sY#
int i2=mid+1; HmKvu"3
for(int cur=l;cur<=r;cur++){ Yao>F--?
if(i1==mid+1) '<~rV
data[cur]=temp[i2++]; w]]`/`
else if(i2>r) d=V4,:=S
data[cur]=temp[i1++]; W[PZQCL}K)
else if(temp[i1] data[cur]=temp[i1++]; @Tb
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else 9|WBJ6
data[cur]=temp[i2++]; E9pKR+P
} O$u;]cg
} 4r#O._Z
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} A]R7H1
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改进后的归并排序: -B:Z(]3#\
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package org.rut.util.algorithm.support; 3lH#+@
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import org.rut.util.algorithm.SortUtil; #S2LQ5U
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/** w,TyV%b[_
* @author treeroot !+Z"7e
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* @since 2006-2-2 ANtp7ad
* @version 1.0 |t CD@M
*/ 6GX'&z
public class ImprovedMergeSort implements SortUtil.Sort { Ag}V>i'
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private static final int THRESHOLD = 10; pcXY6[#N
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/* ;wND?:
* (non-Javadoc) >"?HbR9
* $_ub.g|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) '7o'u]
*/ #@H{Ypn`
public void sort(int[] data) { '&Ox,i]t
int[] temp=new int[data.length]; z"o;|T:
mergeSort(data,temp,0,data.length-1); b7R#tT
} NHA
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private void mergeSort(int[] data, int[] temp, int l, int r) { 9\3% 5B7
int i, j, k; #b\&Md|;
int mid = (l + r) / 2; xP*9UXZ4P
if (l == r) wpu]{~Y
return; 2!>phE
if ((mid - l) >= THRESHOLD) &:=
mergeSort(data, temp, l, mid); Gp9>R~$
else {YZ)IaqZ
insertSort(data, l, mid - l + 1); C.L5\"%
if ((r - mid) > THRESHOLD) }hyK/QUCoN
mergeSort(data, temp, mid + 1, r); ac>}$Uw)
else b0X*+q
insertSort(data, mid + 1, r - mid); y2>v'%]2
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for (i = l; i <= mid; i++) { AbUU#C7
temp = data; 8OH<ppi
} ASY
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for (j = 1; j <= r - mid; j++) { 6CO>Tg:%
temp[r - j + 1] = data[j + mid]; ;d G.oUk=
} y$s}-O]/-
int a = temp[l]; L`FsK64@
int b = temp[r]; ^!k^=ST1J
for (i = l, j = r, k = l; k <= r; k++) { S#0y\
if (a < b) { Y>t*L#i
data[k] = temp[i++]; }D
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a = temp; K4SR`Q
} else { nkHr(tF
7
data[k] = temp[j--]; Iu|G*~\
b = temp[j]; ~6U@*Svk
} 3Zg=ZnF
} S;NChu?8
} WhE5u&`
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/** qMYR\4"$
* @param data p`gg
* @param l OH5
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* @param i ( f8g}2
*/ deaxb8'7
private void insertSort(int[] data, int start, int len) { ~B>I?j
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); %r6LU<;1@
} F<BhN+U
} %s$_KG !&
} pTUsdao^,
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}