归并排序: k\GcHI-
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package org.rut.util.algorithm.support; B0]~el
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import org.rut.util.algorithm.SortUtil; ZzT9j~
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/** QMb Ouw
* @author treeroot (JFWna0@
* @since 2006-2-2 t{vJM!kdlQ
* @version 1.0 6V01F8&w
*/ YcpoL@ab
public class MergeSort implements SortUtil.Sort{ ;;N9>M?b
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/* (non-Javadoc) I9hK }D
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) kpN)zxfk
*/ %OOl'o"V{s
public void sort(int[] data) { hx]?&zT@
int[] temp=new int[data.length]; N[
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mergeSort(data,temp,0,data.length-1); A2jUmK.&
} :&9s,l
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private void mergeSort(int[] data,int[] temp,int l,int r){ 81
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int mid=(l+r)/2; x+@rg];m
if(l==r) return ; N5b!.B x-w
mergeSort(data,temp,l,mid); HCC#j9UN6
mergeSort(data,temp,mid+1,r); @r/nF5
for(int i=l;i<=r;i++){ oEZdd#*;
temp=data; %M|hA#04vZ
} }Ud*TOo `
int i1=l; _>X+ZlpU:
int i2=mid+1; 0^K">
for(int cur=l;cur<=r;cur++){ eV?2LtT#5
if(i1==mid+1) Zba2d,8/
data[cur]=temp[i2++]; J{fH['tzO
else if(i2>r) RdRp.pb8
data[cur]=temp[i1++]; l]l'4@1
else if(temp[i1] data[cur]=temp[i1++]; 338k?nHxv
else U#WF;q0L
data[cur]=temp[i2++]; l)l^[2
} n]o<S+z
} %aVq+kC h
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} |H+UOEiv,p
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改进后的归并排序: PBTnIU
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package org.rut.util.algorithm.support; P:MT*ra*,
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import org.rut.util.algorithm.SortUtil; mSl.mi(JiZ
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/** ok\vQs(a
* @author treeroot Q:d]imw!O
* @since 2006-2-2 0[?Xxk}s0
* @version 1.0 ?QdWrE_
*/ :(*V?WI
public class ImprovedMergeSort implements SortUtil.Sort { K:#I
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private static final int THRESHOLD = 10; =R$u[~Xl2X
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/* -Cc^d!::
* (non-Javadoc) ^ Q ?
* CU2*z(]&
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _H7x9
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*/ #( 146
public void sort(int[] data) { |~mOfuQb
int[] temp=new int[data.length]; ra
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mergeSort(data,temp,0,data.length-1); O`t&ldU
} fdi\hg^x
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private void mergeSort(int[] data, int[] temp, int l, int r) { eF-."1
int i, j, k; qHlQ+:n
int mid = (l + r) / 2; . ~~T\rmI
if (l == r) !Pfr,a
return; 7CURhDdk
if ((mid - l) >= THRESHOLD) C{xaENp
mergeSort(data, temp, l, mid); w;:*P
else ,G?WAOy,
insertSort(data, l, mid - l + 1); #r~# I}U
if ((r - mid) > THRESHOLD) (2E\p
mergeSort(data, temp, mid + 1, r); '/p/8V.O.
else XnMvKPerv'
insertSort(data, mid + 1, r - mid); Gk&)08
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for (i = l; i <= mid; i++) { 1FL~ndJs
temp = data; LxSpctiNx
} >7T'OC
for (j = 1; j <= r - mid; j++) { h_3E)jc
temp[r - j + 1] = data[j + mid]; ]dmrkZz:
} &d?CCb$|0Y
int a = temp[l]; }?_?V&K|
int b = temp[r]; qvKG-|j
for (i = l, j = r, k = l; k <= r; k++) { z3m85F%dR
if (a < b) { u?<%q!
data[k] = temp[i++]; yfjWbW
a = temp; Z4w!p?Wqa
} else { 6@F9G4<Z
data[k] = temp[j--]; sW'AjI
b = temp[j]; Y0dEH^I
} x,@B(9No
} Zbt.t]N
} '9Xu
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/** s.QwSbw-g
* @param data _P 3G
* @param l rCbDu&k]
* @param i SaAFz&WRl
*/ Q}K"24`=
private void insertSort(int[] data, int start, int len) { b;W3j
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); _Gi4A
} oC: {aK6\
} /1V xc 6
} 5o'FS{6U
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}