SCIENCE CHINA Information Sciences, Volume 64 , Issue 5 : 152103(2021) https://doi.org/10.1007/s11432-019-2630-2

## Incremental algorithms for the maximum internal spanning tree problem

• AcceptedJul 28, 2019
• PublishedApr 6, 2021
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### References

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•

Algorithm 1 Simple $2$-competitive algorithm for IMIST

Require:A connected graph $G=(V,E)$.

Output:A feasible solution $S$ for $G$ with competitive ratio $2$.

if $G$ only contains one vertex then

Return an empty sequence;

end if

Let $T$ be a tree comprising an arbitrary edge in $E$;

Use $S$ to maintain the feasible solution and set the only edge in $T$ to be the first edge in $S$;

while $\abs{V(T)}<n$ do

if there exists a maximal path $P$ of length at least one in $G\setminus~V(T)$ whose starting vertex $v$, has a neighbor $u$ in $T$ then

Let $P&apos;=(u,~P)$;

Add all edges in $P&apos;$ to $T$

Append edges in $P&apos;$ one-by-one into $S$, from the first to the last along the path

else

for all $v\in~V\setminus~V(T)$

Add an edge $\{~u,~~v\}$ connecting $v$ and some vertex $u\in~V(T)$ to $T$;

Append $\{~u,~~v\}$ into $S$;

end for

end if

end while

Return $S$.

•

Algorithm 2 Refined algorithm for the IMIST problem

Let $P&apos;=(v,~P)$;

Require:A connected graph $G=(V,E)$.

Output:A feasible solution $S$ of $G$.

Determine a $\frac{5}{3}$-approximate maximum internal spanning tree $T$ of $G$;

Set $S$ to be an empty sequence;

Exhaustively apply Rules 1 and 2 to $T$ and only apply Rule 2 when Rule 1 is not applicable;

Determine a longest path $P$ in $T$;

Individually add the edges in $P$ to $S$ such that the edges in $S$ form a tree after each addition;

Let $T&apos;:=P$;

while $\abs{V(T&apos;)}<n$ do

Determined a longest path $P$ in $T\setminus~V(T&apos;)$;

Let $u$ be the endpoint of $P$ that has a neighbor $v$ in $T&apos;$;

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