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Record W2594960983

The Maximum Number of Runs in a String

2007· article· en· W2594960983 on OpenAlexaff
Bill Smyth

Bibliographic record

Venuenot available
Typearticle
Languageen
FieldComputer Science
TopicAlgorithms and Data Compression
Canadian institutionsMcMaster University
Fundersnot available
KeywordsSubstringCombinatoricsMathematicsString (physics)Integer (computer science)ExponentPeriod (music)PrefixDiscrete mathematicsPhysicsData structureComputer science
DOInot available

Abstract

fetched live from OpenAlex

nor x[i−|u|..i−1] equals u. We say the repetition has period |u| and exponent e; it can be specified by the integer triple (i, |u|, e). It is well known [2] that the maximum number of repetitions in a string x = x[1..n] is Θ(n log n), and that the number of repetitions in x can be computed in Θ(n log n) time [2, 1, 10]. A string u is a run iff it is periodic of (minimum) period p ≤ |u|/2. Thus x = abaabaabaabaab = (aba)4ab is a run of period |aba| = 3. A substring u = x[i..j] of x is a run or maximal periodicity in x iff it is a run of period p and neither x[i−1..j] nor x[i..j+1] is a run of period p. The run u has exponent e = b|u|/pc and possibly empty tail t = x[i+ep..j] (proper prefix of x[i..i+p−1]). Thus

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame machine prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.

metaresearch head score (Codex)0.001
metaresearch head score (Gemma)0.007
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Theoretical or conceptual · Consensus signal: none
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.007
Threshold uncertainty score0.022

Distilled classifier scores by category (both heads)

CategoryCodexGemma
Metaresearch0.0010.007
Meta-epidemiology (narrow)0.0010.000
Meta-epidemiology (broad)0.0010.000
Bibliometrics0.0010.001
Science and technology studies0.0010.001
Scholarly communication0.0020.003
Open science0.0010.002
Research integrity0.0010.001
Insufficient payload (model declined to judge)0.0070.002

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.011
GPT teacher head0.276
Teacher spread0.265 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designTheoretical or conceptual
Domainnot available
GenreEmpirical

How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".

Quick stats

Citations9
Published2007
Admission routes1
Has abstractyes

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