归并排序: w2]]##J
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package org.rut.util.algorithm.support; 8Vm)jnM
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import org.rut.util.algorithm.SortUtil; -[A=\]RfJ
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/** <QRRD*\
* @author treeroot JW=P}h
* @since 2006-2-2 g/z7_Aq/
* @version 1.0 Q[% +y.
*/ ^' b[#DG>F
public class MergeSort implements SortUtil.Sort{ V%w]HIhq
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/* (non-Javadoc) 3B ;aoejHm
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) sTzt
*/ ";/,FUJJ
public void sort(int[] data) { k
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int[] temp=new int[data.length]; ;LFs.Jc<
mergeSort(data,temp,0,data.length-1); yex0rnQ|
} BWG#W C
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private void mergeSort(int[] data,int[] temp,int l,int r){ pM_oIH'8:
int mid=(l+r)/2; -* piC(
if(l==r) return ; {#TZFB
mergeSort(data,temp,l,mid); X2C&q$8
mergeSort(data,temp,mid+1,r); } |? W
for(int i=l;i<=r;i++){ a.G;s2>
temp=data; OYk/K70l3
} 05[k@f$n
int i1=l; ,=t}|!jx
int i2=mid+1; {edjvPlk
for(int cur=l;cur<=r;cur++){ _*dUH5
if(i1==mid+1) gO]jeO
data[cur]=temp[i2++]; `BKV/Xl
else if(i2>r) ,wH]|`w
data[cur]=temp[i1++]; >0jg2vqt
else if(temp[i1] data[cur]=temp[i1++]; .hytn`+9
else F*/J`l
data[cur]=temp[i2++]; \m3ca-Y
} 0r'<aA`=I
} aiwKkf`\
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} \~@a/J
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改进后的归并排序: HF]|>1WV[
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package org.rut.util.algorithm.support; LRmH@-qP
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import org.rut.util.algorithm.SortUtil; S,2{^X
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/** &0%x6vea
* @author treeroot LIMPW w g
* @since 2006-2-2 ^Y+P(o$HM
* @version 1.0 vvcA-k?
*/ 85]3y%f9
public class ImprovedMergeSort implements SortUtil.Sort { HD{2nZT
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private static final int THRESHOLD = 10; {Z{!tR?+
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/* u|D|pRM-LT
* (non-Javadoc) ;*409P
* 8k
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^Jdji:
*/ ' lMPI@C6r
public void sort(int[] data) { `\5u/i'Ca!
int[] temp=new int[data.length]; ?*2Uw{~}
mergeSort(data,temp,0,data.length-1); zDx*R3%
} +{pS2I}d
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private void mergeSort(int[] data, int[] temp, int l, int r) { {S5HH"
int i, j, k; `KUl
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int mid = (l + r) / 2; 0}iND$6@a
if (l == r) FJ(}@U}57
return; tw%z!u[a
if ((mid - l) >= THRESHOLD) M7g6m
mergeSort(data, temp, l, mid); S{F'k;x/5
else U%E364;F
insertSort(data, l, mid - l + 1); )xj!7:n)
if ((r - mid) > THRESHOLD)
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mergeSort(data, temp, mid + 1, r); UKBaGX:v
else QO(P_az3mg
insertSort(data, mid + 1, r - mid); !f!HVna
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for (i = l; i <= mid; i++) { A/w7(
temp = data; y ZR\(\?<
} ;f+bIYQz
for (j = 1; j <= r - mid; j++) { Y5?OJO{h"
temp[r - j + 1] = data[j + mid]; LyWgaf#/d
} $%BNoSK
int a = temp[l]; hqVxvS"
int b = temp[r]; ;@l5kdZx`
for (i = l, j = r, k = l; k <= r; k++) { pu?D^h9/
if (a < b) { nN$aZSb`
data[k] = temp[i++]; -TU^*
a = temp; ]3bXJE
} else { i"J`$u
data[k] = temp[j--]; &R;Cm]jt
b = temp[j]; *wD| eK7
} xY94v
} r\DA&b
} /yNLFL"
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/** pGdo:L?
* @param data vo JmNH
* @param l mx;1'!'fr
* @param i 7\nR'MOZ
*/
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private void insertSort(int[] data, int start, int len) { o"-*,:Qe
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); pZaOd;t
} nb ,+!)+
} ~s4o1^6L
} :#&Y
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}