归并排序: OE8H |?%
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package org.rut.util.algorithm.support; j"J[dlm2M
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import org.rut.util.algorithm.SortUtil; 2nv-/%]
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/** MU#$tXmnC
* @author treeroot Q"D%xY
* @since 2006-2-2 uEE#A0
* @version 1.0 t=6Wk4
*/ zrazFI0G
public class MergeSort implements SortUtil.Sort{ 5;yVA
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/* (non-Javadoc) ndxijqw
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) mj^]e/s%
*/ (Gp|K6
public void sort(int[] data) {
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int[] temp=new int[data.length]; +`$[h2Z=:
mergeSort(data,temp,0,data.length-1); F3,djZq
} }rbsarG@
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private void mergeSort(int[] data,int[] temp,int l,int r){ x}*Y =Xh
int mid=(l+r)/2; Ymr\8CG/
if(l==r) return ; uL[%R2
mergeSort(data,temp,l,mid); n?z^"vv$i
mergeSort(data,temp,mid+1,r); Z+J;nl
for(int i=l;i<=r;i++){ 7J$5dFV2
temp=data; |&xjuBC
}
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int i1=l; #{L
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int i2=mid+1; GP._C=] ?c
for(int cur=l;cur<=r;cur++){ ukH?O)0O
if(i1==mid+1) v*.#LJEm
data[cur]=temp[i2++]; eV x
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else if(i2>r) },'Ij;
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data[cur]=temp[i1++]; DHO+JtO
else if(temp[i1] data[cur]=temp[i1++]; G*$a81dAX
else DZ9qIc}Y
data[cur]=temp[i2++]; lS:R##
} -a(\(^NW
} <78LB/:
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} -$J%.fdPs
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改进后的归并排序: gc6T`O-_;
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package org.rut.util.algorithm.support; }:5>1FfX=
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import org.rut.util.algorithm.SortUtil; 4{1.[##]o
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/** (KDv>@5
* @author treeroot dqvgy yq
* @since 2006-2-2 <Gr775"
* @version 1.0 V,@Y,
*/ E*t0ia8
public class ImprovedMergeSort implements SortUtil.Sort { tt7l%olw
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private static final int THRESHOLD = 10;
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/* Jc#()4
* (non-Javadoc) &Z^,-Y
* 1wqsGad+;
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1Jx|0YmO
*/ sO!YM5v8
public void sort(int[] data) { U/JeEI%L
int[] temp=new int[data.length]; -;?5<>zZ
mergeSort(data,temp,0,data.length-1); zJfoU*G/B
} ?=]*r>a3
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private void mergeSort(int[] data, int[] temp, int l, int r) { O_p:`h:;M
int i, j, k; h69: Tj!
int mid = (l + r) / 2; 'CH|w~E
if (l == r) gJyFt8Z<
return; kd9GHN;7
if ((mid - l) >= THRESHOLD) oK GF Dl]3
mergeSort(data, temp, l, mid); KJwkkCE/=
else up~l4]b+
insertSort(data, l, mid - l + 1); <N %8"o
if ((r - mid) > THRESHOLD) P7I,xcOm
mergeSort(data, temp, mid + 1, r); m4@y58n=
else |f^/((:D
insertSort(data, mid + 1, r - mid); :zC'jceO
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for (i = l; i <= mid; i++) { fuQ|[tpvQG
temp = data; c
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} >NN |vj
for (j = 1; j <= r - mid; j++) { #N|)hBz9-
temp[r - j + 1] = data[j + mid]; lHpo/R:
} eB:obz
int a = temp[l]; 'nNw
int b = temp[r]; Q^v8n1
for (i = l, j = r, k = l; k <= r; k++) { =L$};ko
if (a < b) { &50Kn[
data[k] = temp[i++]; $}S5&
a = temp; HnVUG4yZTD
} else { AAsl)
data[k] = temp[j--]; $&m^WrZaY
b = temp[j]; 2I:vie
} gU/\'~HG
} Y. yM 1 z
} k6~k
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/** R,A|"Q
* @param data J1"u,H F*(
* @param l n(a7%Hx2
* @param i +*g[hRw[
*/ "HVwm>qEi
private void insertSort(int[] data, int start, int len) { K+H?,I
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); VVJhQ bP
} SV]M]CAe
} [*?P2.b f
} "G|Gyc
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}