归并排序: J5M+FwZq
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package org.rut.util.algorithm.support; u{H?4|'(
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import org.rut.util.algorithm.SortUtil; *?p|F&J
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/** 5z$,6T
* @author treeroot i'/m4 !>h
* @since 2006-2-2 2h=%K/hhY
* @version 1.0 HfNDD|Zz
*/ `TLzVB-j3
public class MergeSort implements SortUtil.Sort{ {tP%epQ
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/* (non-Javadoc) o2H1N~e#c
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) G@ \Pi#1
*/ 32)tJ|m
public void sort(int[] data) { QCOo
int[] temp=new int[data.length]; ^rNUAj9Z
mergeSort(data,temp,0,data.length-1); p*QKK@C
} <[ Xw)/#
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private void mergeSort(int[] data,int[] temp,int l,int r){ I3b"|%
int mid=(l+r)/2; [I*!
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if(l==r) return ; mB'3N;~
mergeSort(data,temp,l,mid); jdA
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mergeSort(data,temp,mid+1,r); v-j3bB
for(int i=l;i<=r;i++){ OW;tT=ql
temp=data; $^/0<i$
} <i\A_qqc/
int i1=l; C@\{ehG
int i2=mid+1; 9=l.T/?sf
for(int cur=l;cur<=r;cur++){ JAc_kl{4O
if(i1==mid+1) R[tC^]ai
data[cur]=temp[i2++]; l:|D,q
else if(i2>r) 1%[_`J;>Z
data[cur]=temp[i1++]; X@N$Z{
else if(temp[i1] data[cur]=temp[i1++]; U\@A_
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else w*7|dZk{
data[cur]=temp[i2++]; ;U=q-tb
} $m$;v<PSe
} vsB*rP=
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} . RVVWqW
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改进后的归并排序: Z3KO90O!8
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package org.rut.util.algorithm.support; (46 {r}_O
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import org.rut.util.algorithm.SortUtil; 2.uA|~qH
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/** uLeRZSC
* @author treeroot iOw3MfO
* @since 2006-2-2 M5L{*>4|6
* @version 1.0 K]oM8H1
*/ |iYg >
public class ImprovedMergeSort implements SortUtil.Sort { -F/st
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private static final int THRESHOLD = 10; .\Fss(Zn
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/* AbwbAm+
* (non-Javadoc) fN%jJ-[d
* qZk'tRv
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) FjfN3#qlg
*/ \kIMDg3}
public void sort(int[] data) { z$lF)r:Bc
int[] temp=new int[data.length]; :t$aN|>y
mergeSort(data,temp,0,data.length-1); \0;(VLN'U
} bKVj [r8D~
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private void mergeSort(int[] data, int[] temp, int l, int r) { MhEw
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int i, j, k; 4Cb9%Q0
int mid = (l + r) / 2; !c W[G/W8
if (l == r) q0mOG^
return; ~,6b_W p/
if ((mid - l) >= THRESHOLD) 4DWwbO
mergeSort(data, temp, l, mid); OKOu`Hz@
else m*0,s
insertSort(data, l, mid - l + 1); _W!p8cB
if ((r - mid) > THRESHOLD) f&@BKx
mergeSort(data, temp, mid + 1, r); `b5 @}',
else \,UZX&ip
insertSort(data, mid + 1, r - mid); 0[A9b,MMVO
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for (i = l; i <= mid; i++) { Btt]R
temp = data; E4.SF|=x
} ybdd;t}&1
for (j = 1; j <= r - mid; j++) { C_fY %O
temp[r - j + 1] = data[j + mid]; \$*$='6"
} j5$BK[p.
int a = temp[l]; mY!iu(R1
int b = temp[r]; &fP XU*l4
for (i = l, j = r, k = l; k <= r; k++) { I3S9Us-\
if (a < b) { ]<uQ.~
data[k] = temp[i++]; kdx
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a = temp; " K*
} else { JOnyrks
data[k] = temp[j--]; qf)$$ qi
b = temp[j]; Ei>m0
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} 'rP]Nw
} n_D8JF
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/** h:\oly\
* @param data 6$ Q,Y}j
* @param l s Wjy6;
* @param i =dP{ Gh
*/ [t]X/O3<
private void insertSort(int[] data, int start, int len) { >"3>s%
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); s=I'e/"7
}
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} _#$9 y1bd
} 5-u=o)>
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}