Enumeration of monadic second-order queries on trees
Enumeration of monadic second-order queries on trees
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树上一元二阶查询的枚举
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发表时间:
2013
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通讯作者:
L. Segoufin
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作者:
Wojciech Kazana;L. Segoufin
We consider the enumeration problem of Monadic Second-Order (MSO) queries with first-order free variables over trees. In Bagan [2006] it was shown that this problem is in CONSTANT-DELAYlin. An enumeration problem belongs to CONSTANT-DELAYlin if for an input structure of size n it can be solved by:
—an O(n) precomputation phase building an index structure,
—followed by a phase enumerating the answers with no repetition and a constant delay between two consecutive outputs.
In this article we give a different proof of this result based on the deterministic factorization forest decomposition theorem of Colcombet [2007].