归并排序: )]%GNdU
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package org.rut.util.algorithm.support; QH%{r4
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import org.rut.util.algorithm.SortUtil; BcT|TX+ct
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/** G2k r~FG
* @author treeroot Wv"[,5
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* @since 2006-2-2 0n_Cuh\
* @version 1.0 t?v0ylN
*/ %rTXT
public class MergeSort implements SortUtil.Sort{ U3^T.i"R
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/* (non-Javadoc) O;:8mm%(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) H+; _fd
*/ ~"5WQK`@
public void sort(int[] data) { S&V5zB""n
int[] temp=new int[data.length]; r&\}E+
mergeSort(data,temp,0,data.length-1); odquAqn
} $Tq-<FbM)
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private void mergeSort(int[] data,int[] temp,int l,int r){ ;X\>oV3#
int mid=(l+r)/2; {P(Z{9 u%
if(l==r) return ; ''wWw(2O
mergeSort(data,temp,l,mid); P!m~tu}B
mergeSort(data,temp,mid+1,r); ~]A';xH&
for(int i=l;i<=r;i++){ Gn;eh~uw;l
temp=data; e9q/[xMi
} o)?"P;UhJX
int i1=l; &^4W+I{H
int i2=mid+1; q!<`ci,uS
for(int cur=l;cur<=r;cur++){ DSy,#yA
if(i1==mid+1) ~/\;7E{8!
data[cur]=temp[i2++]; *Yvfp{B
else if(i2>r) r[M]2h
data[cur]=temp[i1++]; )u]<8
else if(temp[i1] data[cur]=temp[i1++]; n\*>mp)
else *`);_EVc
data[cur]=temp[i2++]; q`}Q[Li
} f<WnPoV
} OV>T}Fq
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} K~@-*8%
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改进后的归并排序: =YZp,{T
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package org.rut.util.algorithm.support; ,h5.Si>
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import org.rut.util.algorithm.SortUtil; rQ*'2Zf'<
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/** nUhD41GJ
* @author treeroot -j]r\EVKS
* @since 2006-2-2 `U!eh1*b
* @version 1.0 ED"5y
*/ Y#{KGVT<
public class ImprovedMergeSort implements SortUtil.Sort { ',6QL4qV/
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private static final int THRESHOLD = 10; 0V}vVAa(B
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/* [CRy>hfV
* (non-Javadoc) ~@BV
* vo uQ.utl
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) .(CzsupY_q
*/ tmK@Veb*a'
public void sort(int[] data) { k'%c| kx8U
int[] temp=new int[data.length]; p`Omcl~Q
mergeSort(data,temp,0,data.length-1); ?_W "=WpC
} k%:]PQjYT
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private void mergeSort(int[] data, int[] temp, int l, int r) { A~I}[O~(pb
int i, j, k; ):LJ {.0R
int mid = (l + r) / 2; 1uMnlimr
if (l == r) ?*,N
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return; q'+XTal
if ((mid - l) >= THRESHOLD) vxr3|2`
mergeSort(data, temp, l, mid); :XBeGNI*#
else -hp,O?PM
insertSort(data, l, mid - l + 1); 8,dCx}X
if ((r - mid) > THRESHOLD) 0NpxqeIDY
mergeSort(data, temp, mid + 1, r); 1.yw\ZC\
else _h@7>+vl~
insertSort(data, mid + 1, r - mid); &sJpn*W
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for (i = l; i <= mid; i++) { 9S&6u1
temp = data; Mk|h ><Q"
} '$1-A%e$1
for (j = 1; j <= r - mid; j++) { ;N ]ElwP
temp[r - j + 1] = data[j + mid]; 'D\(p,(Mt
} -Q 6W`*8
int a = temp[l]; :;{U2q+
int b = temp[r]; qdZn9i
for (i = l, j = r, k = l; k <= r; k++) { 4^70r9hV9
if (a < b) { fgn*3 pg
data[k] = temp[i++]; .yi.GRk
a = temp; xE;fM\7pu
} else { o0s+ roiD
data[k] = temp[j--]; LL9Mty,
b = temp[j]; ]wa?~;1^&
} 8-juzL}
} =kZPd>&L
} go2:D#mf
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/**
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* @param data rx_'(
* @param l 5>}L3r>a;
* @param i {U^mL6=&v
*/ <diI*H<G
private void insertSort(int[] data, int start, int len) { 1#]tCi`
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); y7d)[d*Mz
} te" 8ZmJ
} a4g=cs<9}
} vWe)c J
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}