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package org.rut.util.algorithm.support; C.rLog#
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import org.rut.util.algorithm.SortUtil; *4oj '}
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/** &Y/Myh[P
* @author treeroot Fo86WP}
* @since 2006-2-2 vx&r
* @version 1.0 @&
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*/ |wYOO(!
public class MergeSort implements SortUtil.Sort{ B^C!UWN>%X
{ :m%n-
/* (non-Javadoc) e6JT|>9A7
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) rs?"pGz;
*/ @M!WosRk
public void sort(int[] data) { c6"hk_
int[] temp=new int[data.length]; $&l}
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mergeSort(data,temp,0,data.length-1); 1P1"xT
} ~Vf+@_G8`
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private void mergeSort(int[] data,int[] temp,int l,int r){ = ^OXP+o
int mid=(l+r)/2; f#3U,n8:
if(l==r) return ; `3KXWN`.s
mergeSort(data,temp,l,mid); _T)G?iv:&
mergeSort(data,temp,mid+1,r); 2A^>>Q/,u
for(int i=l;i<=r;i++){ 0-!K@#$>=
temp=data; '.8E_Jd0E
} }q~M$
int i1=l; vn0}l6n3s
int i2=mid+1; eGi[LJ)np
for(int cur=l;cur<=r;cur++){
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if(i1==mid+1) RO10$1IW.2
data[cur]=temp[i2++]; u_~*)w+mS@
else if(i2>r) },@1i<Bb
data[cur]=temp[i1++]; 5C^oqUZ
else if(temp[i1] data[cur]=temp[i1++]; @C34^\aH+
else ^A"TY
data[cur]=temp[i2++]; vUa&9Y
} 5`?'}_[Yj
} MsL*\)*s
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} F7r!zKXZ
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改进后的归并排序: .2V`sg.!
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package org.rut.util.algorithm.support; as%ab[ fX
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import org.rut.util.algorithm.SortUtil; wh~g{(Xvq
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/** 6AW{qU6
* @author treeroot Eoo[)V#x{
* @since 2006-2-2 ee0)%hc1t
* @version 1.0 (4WAoye |
*/ 3TDjWW;#~
public class ImprovedMergeSort implements SortUtil.Sort { r?l7_aBv3
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private static final int THRESHOLD = 10; TrBBV]4
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/* ~)k OOoH
* (non-Javadoc) bQ3EBJT{P
* b?~%u+'3
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +U:U/c5Z^
*/ !N@d51T=N
public void sort(int[] data) { 0 kM4\En
int[] temp=new int[data.length]; +oT/ v3,
mergeSort(data,temp,0,data.length-1); `qnNEJL,
} 4%(\y"T
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private void mergeSort(int[] data, int[] temp, int l, int r) { G; *jL4
int i, j, k; <+tSTc4>r
int mid = (l + r) / 2; yX'f"*
if (l == r) uV@#;c4
return; mT7B#^H
if ((mid - l) >= THRESHOLD) kX2bU$1Q,i
mergeSort(data, temp, l, mid); i#lnSJ08
else dV( "g],
insertSort(data, l, mid - l + 1); ])sIQ{P
if ((r - mid) > THRESHOLD) l|z0aF;z
mergeSort(data, temp, mid + 1, r); 1zDat@<H
else `=zlS"dQ
insertSort(data, mid + 1, r - mid); qkEre
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for (i = l; i <= mid; i++) { !FqJP
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temp = data; /g_cz&luR
} M'n2 j
for (j = 1; j <= r - mid; j++) { p:GB"e9>H
temp[r - j + 1] = data[j + mid]; b3Uw"{p
} r}1.=a
int a = temp[l]; xxsax/h
int b = temp[r]; 7l%]/`Y-
for (i = l, j = r, k = l; k <= r; k++) { S{q c1qj
if (a < b) { 1j9R^
data[k] = temp[i++]; tLz,t&h
a = temp; i Sm
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} else { 8)wxc1
data[k] = temp[j--]; FKX+
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b = temp[j]; yFYFFv\?
} z;dFS
} 3Dd"qON!
} kTjx.
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/** ~ryB*eZH
* @param data j`'9;7h M6
* @param l &RzkM4"
* @param i
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*/ 'nrXRDb
private void insertSort(int[] data, int start, int len) { gB;5&;T:
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); #%;QcDXRe
} /oWn0
} eYN=?
} q,8TOn
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}