归并排序: C@[U:\
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package org.rut.util.algorithm.support; S{v]B_N[M
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import org.rut.util.algorithm.SortUtil; KT*>OYI
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/** Jf0i$
* @author treeroot VXlAK(
* @since 2006-2-2 kj.9\
* @version 1.0 \t/0Yh-'
*/ {]Cn@.TPD
public class MergeSort implements SortUtil.Sort{ !*HJBZ]q
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/* (non-Javadoc) )''V}Zn.X
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1Sza%D;3
*/ $duT'G, -
public void sort(int[] data) { D^V)$ME
int[] temp=new int[data.length]; lhnGk'@d
mergeSort(data,temp,0,data.length-1); $-~"G,;F
} ZBFn
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private void mergeSort(int[] data,int[] temp,int l,int r){ b62B|0i
int mid=(l+r)/2; A%7f;&x!
if(l==r) return ; >Yk|(!v
mergeSort(data,temp,l,mid); >;bym)
mergeSort(data,temp,mid+1,r); .pdcwd9
for(int i=l;i<=r;i++){ '1xhP}'3)
temp=data; Iz'Et'w8!
} |5:2?S2R
int i1=l; JR
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int i2=mid+1; tLN^k;w
for(int cur=l;cur<=r;cur++){ GUqG1u z9
if(i1==mid+1) MEJX5qG6m
data[cur]=temp[i2++]; pwS"BTZ
else if(i2>r) &WL::gy_S
data[cur]=temp[i1++]; 9E8&~y
else if(temp[i1] data[cur]=temp[i1++]; <|?)^;R5!
else surNJ,)
data[cur]=temp[i2++]; WiB~sIp
} V9qA'k
} :8@eon}
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改进后的归并排序:
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package org.rut.util.algorithm.support; c2,g%(
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import org.rut.util.algorithm.SortUtil; j[FB*L1!D
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/** c}|.U
* @author treeroot &z5?]`ALu
* @since 2006-2-2 FE{c{G<
* @version 1.0 %t!r
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*/ |4P8N{ L>O
public class ImprovedMergeSort implements SortUtil.Sort { mAGD qz>f
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private static final int THRESHOLD = 10; u0sN[<
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/* vE8'B^h1
* (non-Javadoc) ]v),[]Xs
* ?I?~BWu
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \v\ONp"
*/ kdlmj[=
public void sort(int[] data) { +v5f-CBu
int[] temp=new int[data.length]; "=C~IW
mergeSort(data,temp,0,data.length-1); s-'~t#h
} }fkdv6mz
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private void mergeSort(int[] data, int[] temp, int l, int r) { r(Z?Fs/
int i, j, k; )4s7,R
int mid = (l + r) / 2; bpU>(j
if (l == r) ~vA8I#.
return; He4HIZ
if ((mid - l) >= THRESHOLD) yHC[8l8%
mergeSort(data, temp, l, mid); >R6mI
else MZf?48"f
insertSort(data, l, mid - l + 1); 0<uLQVoR2n
if ((r - mid) > THRESHOLD) &Z!y>k%6
mergeSort(data, temp, mid + 1, r); qN' 3{jiPL
else l/B+k
insertSort(data, mid + 1, r - mid); $M0l
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for (i = l; i <= mid; i++) { x0{B7/FN
temp = data; e1JHN
} YU+P+m2X
for (j = 1; j <= r - mid; j++) { yi~]}M
temp[r - j + 1] = data[j + mid]; [_3&
} J!6w9,T_
int a = temp[l]; LWhy5H;Es
int b = temp[r]; <8?
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for (i = l, j = r, k = l; k <= r; k++) { )p;t
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if (a < b) { 5bXpj86mY
data[k] = temp[i++]; -EFdP] XO
a = temp; SB('Nqih
} else { I9aiAD0s
data[k] = temp[j--]; )16+Pm8
b = temp[j]; d/Wp>A@dob
} F;_o `h
} fJ
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} ;vPFRiFK
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/** NKB["+S<
* @param data T]1.":
* @param l )=#Js<&3:
* @param i xZ%3e
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*/ K8-1?-W
private void insertSort(int[] data, int start, int len) { R1Q,m
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); U,T#{
} e:4,rfF1
} hJ[keaO
} ht6}v<x.eA
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}