归并排序: NbfV6$jo
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package org.rut.util.algorithm.support; h*&-[nSo
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import org.rut.util.algorithm.SortUtil; LL.YkYu
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/** 4WDh8U
* @author treeroot 7X1T9'jI2
* @since 2006-2-2 KLlW\MF1
* @version 1.0 *qGxQ?/
*/ j@Z4(XL
public class MergeSort implements SortUtil.Sort{ $\{@wL
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/* (non-Javadoc) >*dqFZF
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ZOfyy E
*/ hesL$Z [
public void sort(int[] data) { ^P\(IDJCo
int[] temp=new int[data.length]; ?r#e
mergeSort(data,temp,0,data.length-1); jsc1B
} BPe5c :z
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private void mergeSort(int[] data,int[] temp,int l,int r){ fY$M**/,
int mid=(l+r)/2; yp_:]RE
if(l==r) return ; (B]rINY|
mergeSort(data,temp,l,mid); mq su8ti
mergeSort(data,temp,mid+1,r); h0d;a
for(int i=l;i<=r;i++){ t-i;
temp=data; KR%DpQ&{'
} @'s^
int i1=l; fD]}&xc
int i2=mid+1; WFULQQ*
for(int cur=l;cur<=r;cur++){ j8L!miv6
if(i1==mid+1) -T`rk~A9A
data[cur]=temp[i2++]; vG69z&
else if(i2>r) 8"Hy'JA$O
data[cur]=temp[i1++]; {Jwh .bJ
else if(temp[i1] data[cur]=temp[i1++]; (
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else 9}jF]P*Q
data[cur]=temp[i2++]; [C9 ->`(`
} ON\_9\kv
} J9zSBsp_
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} xP
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改进后的归并排序: c54oQ1Q&"
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package org.rut.util.algorithm.support; O4S~JE3o
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import org.rut.util.algorithm.SortUtil; V31<~&O~%
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/** VkZrb2]v
* @author treeroot 4(f[Z9 iZ]
* @since 2006-2-2 db'Jl^
* @version 1.0 Zchs/C 9{
*/ M6[&od
public class ImprovedMergeSort implements SortUtil.Sort { &2d^=fih
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private static final int THRESHOLD = 10; bb`GV
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/* 4U*J{''L
* (non-Javadoc) Om,+59ua*
* Q
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 540-l Me
*/ d dkh*[
public void sort(int[] data) { 67wY_\m 9I
int[] temp=new int[data.length]; ,|<2wn#q
mergeSort(data,temp,0,data.length-1); 4#1[i|:M
} MuQyHEDF
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private void mergeSort(int[] data, int[] temp, int l, int r) { 6*J`2U9Q
int i, j, k; 3pl/kT.\
int mid = (l + r) / 2; !ZJ"lm
if (l == r) imv[xBA(d
return; <,$(,RX
if ((mid - l) >= THRESHOLD) *Fi`o_d9[`
mergeSort(data, temp, l, mid); /'ccFm2
else
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insertSort(data, l, mid - l + 1); KuL2X@)}
if ((r - mid) > THRESHOLD) 4Z12Z@ A#7
mergeSort(data, temp, mid + 1, r); M_<O'Ii3
else meA=lg?
insertSort(data, mid + 1, r - mid); CkKr@. dV
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for (i = l; i <= mid; i++) { }(4U7Ac
temp = data; sKVN*8ia
} $!)Sgb
for (j = 1; j <= r - mid; j++) { O0`sg90,C
temp[r - j + 1] = data[j + mid]; rlEEf/m:
} o{f|==<t3#
int a = temp[l]; ACxOC 2\n
int b = temp[r]; -!f)P=S
for (i = l, j = r, k = l; k <= r; k++) { "l &=a1l
if (a < b) { 8QDs4Bv|
data[k] = temp[i++]; U` uP^
a = temp; ViIt'WX
} else { $hZb<Xz
data[k] = temp[j--]; sEP-jEuwG
b = temp[j]; DN3#W w2[r
} BQu_)@
} <5X?6*Qvr
} SAMP,un7
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/** J6r"_>)z
* @param data bw\fKZ
* @param l GVhO}m
* @param i h
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*/ M0zJGIT~b
private void insertSort(int[] data, int start, int len) { ofH=h
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ^m8T$^z>
} :iqFC >D
} &7"a.&*9xX
} /T1zz2l~
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}