归并排序: `h]f(
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package org.rut.util.algorithm.support; K?I&,t_*R
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import org.rut.util.algorithm.SortUtil; -L3RzX
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/** +Ea XS
* @author treeroot H2KY$;X[
* @since 2006-2-2 2$UR"P
* @version 1.0 q{(&:~M
*/ &1Iy9&y
public class MergeSort implements SortUtil.Sort{ B)NB6dCp
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/* (non-Javadoc) K Hc +
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) e4LNnJU\|
*/ QQcj"s
public void sort(int[] data) { (HxF\#r?
int[] temp=new int[data.length]; ^%^0x'"
mergeSort(data,temp,0,data.length-1); 9jO+ew
} N$b;8F
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private void mergeSort(int[] data,int[] temp,int l,int r){ 2"^9t1C2
int mid=(l+r)/2; k"c_x*f
if(l==r) return ; F4{<;4N0
mergeSort(data,temp,l,mid); pP&M]'
mergeSort(data,temp,mid+1,r); y?hW#l~#X
for(int i=l;i<=r;i++){ {HDlv[O%
temp=data; z#/*LP#oY
} C_)>VPD
int i1=l; iB-s*b<`~
int i2=mid+1; K>eG5tt
for(int cur=l;cur<=r;cur++){ c,ek]dTj
if(i1==mid+1)
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data[cur]=temp[i2++]; *5)!y
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else if(i2>r) >c eU!=>
data[cur]=temp[i1++]; 3!W&J
else if(temp[i1] data[cur]=temp[i1++]; RkM! BcB
else b>WT-.b0
data[cur]=temp[i2++]; ) P])0Y-
} I-"{m/PEdg
} n5/Q)*e0'#
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改进后的归并排序: 0rUf'S
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package org.rut.util.algorithm.support; s,x]zG"
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import org.rut.util.algorithm.SortUtil; $Plk4 o*g
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/** xcA:Q`c.{
* @author treeroot 4N&}hOM'S
* @since 2006-2-2 2D"/k'iA
* @version 1.0 O/nS,Ux
*/ ,,gYU_V
public class ImprovedMergeSort implements SortUtil.Sort { !NjE5USi
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private static final int THRESHOLD = 10; Q!v[b{]8
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/* o5uwa{v
* (non-Javadoc) 8),Y|4
* TH &B9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) .VT,,0
*/ 6npwu5!
public void sort(int[] data) { a$m?if=
int[] temp=new int[data.length]; 79_MP
mergeSort(data,temp,0,data.length-1); Viw3 /K
} Z%R^;8 !~
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private void mergeSort(int[] data, int[] temp, int l, int r) { ,d#4Ib
int i, j, k; W!*vO>^1W
int mid = (l + r) / 2; AbB>ZT>hR
if (l == r) K#@FKv|("
return; 4NIfQYC.
if ((mid - l) >= THRESHOLD) $P_Y8:
mergeSort(data, temp, l, mid); jYv
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else vCM'nkXY
insertSort(data, l, mid - l + 1); 1YxI q565
if ((r - mid) > THRESHOLD) =_Rd0,
mergeSort(data, temp, mid + 1, r); e<K=Q$U.
else }{J8U2])k
insertSort(data, mid + 1, r - mid); _NFJm(X.
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for (i = l; i <= mid; i++) { +8M{y D9#
temp = data; Hw?
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} >B0S5:S$W
for (j = 1; j <= r - mid; j++) { ??PpHBJ')
temp[r - j + 1] = data[j + mid]; FmPF7
} H'2 =yhtVh
int a = temp[l]; ^E^: =Q?'_
int b = temp[r]; \z
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for (i = l, j = r, k = l; k <= r; k++) { yr?\YKV)I
if (a < b) { 566EMy|
data[k] = temp[i++]; -/X-.#}-
a = temp; uvL|T48
} else { 0/$sr;
data[k] = temp[j--]; S%2qB;uw
b = temp[j]; ln5On_Wm
} &BkNkb 0
} =RA6 p
} aF:LL>H
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/** $)3/N&GXR
* @param data ) =[Tgh
* @param l 0U'r ia:$
* @param i W2RS G~|
*/ kVY@q&p
private void insertSort(int[] data, int start, int len) { C;` fOCz^
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); jolCR-FDu
} @)B_e*6>'
} "<n{/x(
} DWAU8>c+
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}