归并排序: '@.Lg0`
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package org.rut.util.algorithm.support; Q=[ IO,f
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import org.rut.util.algorithm.SortUtil; 2t?>0)*m
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/** D]'8BS3
* @author treeroot vt(}8C+
* @since 2006-2-2 XS&;8 PO
* @version 1.0 9MQwc
*/ |KPNl\%ID
public class MergeSort implements SortUtil.Sort{ /Gb)BJk!
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/* (non-Javadoc) Lew
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^K~=2^sh
*/ v-!Spf
public void sort(int[] data) { 6y?uH;SL
int[] temp=new int[data.length]; }+u<w{-7/
mergeSort(data,temp,0,data.length-1); w9gfva$&
} CL(D&8v8~
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private void mergeSort(int[] data,int[] temp,int l,int r){ Yyw3+3
int mid=(l+r)/2; 4/S3hH
if(l==r) return ; fv*
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mergeSort(data,temp,l,mid); x @9rc,by
mergeSort(data,temp,mid+1,r); y<v-,b*
for(int i=l;i<=r;i++){ JV!F<
temp=data; {Ov{O,c5
} D7B g!*
int i1=l; %(\et%[]
int i2=mid+1; R"F: (
for(int cur=l;cur<=r;cur++){ l
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if(i1==mid+1) v.,D,6qZ
data[cur]=temp[i2++]; 1^WkW\9kO
else if(i2>r) LiGECqWBa'
data[cur]=temp[i1++]; 0NvicZ7VR
else if(temp[i1] data[cur]=temp[i1++]; Z)u_2e
else +& M>J|
data[cur]=temp[i2++]; x;STt3M~
} !0KNA1w,
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改进后的归并排序: {
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package org.rut.util.algorithm.support; zx?|5=+!
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import org.rut.util.algorithm.SortUtil; uF
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/** S1i~r+jf
* @author treeroot @'J[T: e
* @since 2006-2-2 #%z@yg
* @version 1.0 7$"5qJ{ s
*/ [zCKJR
public class ImprovedMergeSort implements SortUtil.Sort { A- #c1KU!
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private static final int THRESHOLD = 10; g- INhzMu
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/* 1n>AN.nI
* (non-Javadoc) Q$yQ^ mG
* Qgo|\=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) X#MC|Fzy@
*/ uxW<Eh4H*
public void sort(int[] data) { )@.0ai
int[] temp=new int[data.length]; OeQ~g-n
mergeSort(data,temp,0,data.length-1); j#H&~f
} S09Xe_q
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private void mergeSort(int[] data, int[] temp, int l, int r) { %w3tzE1Hq
int i, j, k; 7U&<{U<
int mid = (l + r) / 2; E@Yq2FBpnn
if (l == r) ZYTBc#f
return; 7;sF0oB5e
if ((mid - l) >= THRESHOLD) ^|cax|>
mergeSort(data, temp, l, mid); EM'#'fBZ>Y
else ;T>.
insertSort(data, l, mid - l + 1); `2G%&R,k"D
if ((r - mid) > THRESHOLD) kNrd=s,-]D
mergeSort(data, temp, mid + 1, r); ng[LSB*57Y
else |1+mHp
insertSort(data, mid + 1, r - mid); rGQ([e
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for (i = l; i <= mid; i++) { t RTJ Q
temp = data; 0 \o5+
} qcBamf
for (j = 1; j <= r - mid; j++) { *OY
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temp[r - j + 1] = data[j + mid]; (Ii+}Mfp
} e{ZS"e`!
int a = temp[l]; ^8g<>,$
int b = temp[r]; ;![rwra
for (i = l, j = r, k = l; k <= r; k++) { iis}=i7|
if (a < b) { :l {%H^;1
data[k] = temp[i++]; <;!#+|L/
a = temp; *i,A(f'e4X
} else { OlsD
data[k] = temp[j--]; L5]uT`Twa
b = temp[j]; %^;rYn3
} *adwCiB
} 9%?a\#C
} ,Q+.kAh !G
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/** G4n-}R&'
* @param data ebf/cCh
* @param l F||oSJrI
* @param i cB 1NN<
*/ >Qs{LEsLb
private void insertSort(int[] data, int start, int len) { s)kr=zdyo
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); N >];xb>
} qoC<qn{.a
} ,mE}#cyY
} 6dqI{T-i?
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}