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package org.rut.util.algorithm.support; KGHSEZi]
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import org.rut.util.algorithm.SortUtil; ANy*'/f
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/** NOuG# P
* @author treeroot D**GC
* @since 2006-2-2 7P7OTN
* @version 1.0 EP 4]#]5
*/ `om+p?j
public class MergeSort implements SortUtil.Sort{ B+j]C$8}
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/* (non-Javadoc) r~lZ8$KC
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) . \"k49M`
*/ 0{|HRiQH9+
public void sort(int[] data) { k=hWYe$iAz
int[] temp=new int[data.length]; `daqzn
mergeSort(data,temp,0,data.length-1); iU;e!\A
} ||_hET
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private void mergeSort(int[] data,int[] temp,int l,int r){ \ph.c*c
int mid=(l+r)/2; >w@+cUto
if(l==r) return ; =O![>Fu5
mergeSort(data,temp,l,mid); @)?]u
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mergeSort(data,temp,mid+1,r); ?
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for(int i=l;i<=r;i++){ OegeZV
temp=data; AQlB_@ b
} &(rWl`eTY`
int i1=l; i(^U<DW$
int i2=mid+1; {P]C>
for(int cur=l;cur<=r;cur++){ W(`QbNJ
if(i1==mid+1) rtRbr_
data[cur]=temp[i2++]; S3E,0%yo+)
else if(i2>r) xi=ApwNj
data[cur]=temp[i1++]; H<Oo./8+
else if(temp[i1] data[cur]=temp[i1++]; _*fNa!@hY
else ~,b^f{7`!
data[cur]=temp[i2++]; CwA_jOp
} ViPC Yt`of
} \=AA,Il
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} $(aq;DR
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改进后的归并排序: HYmC3
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package org.rut.util.algorithm.support; U]iI8c
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import org.rut.util.algorithm.SortUtil; f'^uuO#x
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/** a /sj W
* @author treeroot `hi=y BO
* @since 2006-2-2 //q(v,D%Q
* @version 1.0 vxOqo)yO
*/ &12KpEyf
public class ImprovedMergeSort implements SortUtil.Sort { _\ToA9 m
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private static final int THRESHOLD = 10; ;uUFgDi
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/* QPJ\Iu@D$
* (non-Javadoc) elOeXYO0
* G%<}TI1}
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) wA=r]BT
*/ ,#A(I#wL~
public void sort(int[] data) { $J`O-"M
int[] temp=new int[data.length]; h:YD$XE
mergeSort(data,temp,0,data.length-1); 5ilGWkb`'X
} N+|NI?R?}
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private void mergeSort(int[] data, int[] temp, int l, int r) { 5i!Q55Yv=,
int i, j, k; 3!"N;Q"
int mid = (l + r) / 2; n/+X3JJ
if (l == r) ~RhUg~o
return; #jQauO
if ((mid - l) >= THRESHOLD) J7+G"_)'
mergeSort(data, temp, l, mid); Dcl$?
else 6#?T?!vZ
insertSort(data, l, mid - l + 1); \<4N'|:
if ((r - mid) > THRESHOLD) $MQ}+*Wr
mergeSort(data, temp, mid + 1, r); cO~<iy
else Z!1D4`w
insertSort(data, mid + 1, r - mid); 1-KNXGb'
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for (i = l; i <= mid; i++) { 9DxHdpOk
temp = data; `8:)? 0Ez
} zfIo]M`
for (j = 1; j <= r - mid; j++) { O
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temp[r - j + 1] = data[j + mid]; m[9.'@ye
} 06&J!,p
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int a = temp[l]; :C~Ar]
int b = temp[r]; *'<AwG&
for (i = l, j = r, k = l; k <= r; k++) { M!UTqf7XL
if (a < b) { 2Je$SE8
data[k] = temp[i++]; .DCHc,DxA
a = temp; 0#,a#P
} else { 8Bf>
data[k] = temp[j--]; /{i~CGc;"
b = temp[j]; > H!sD\b
} 6>>; fy2
} Kc/1LeAik
} rhJ&* 0M
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/** _gvFs%J
* @param data ;[v!#+yml
* @param l 37#&:[w>
* @param i _C?j\Wy
*/ LW %AZkAx
private void insertSort(int[] data, int start, int len) { #2{-6ey
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); +\/Q
} |VBt:dd<
} Yh":>~k?SY
} sVLvnX,
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}