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{
    "pk": 64907,
    "title": "Optimal schemes for combinatorial query problems with integer feedback",
    "subtitle": null,
    "abstract": "A query game is a pair of a set \\(Q\\) of queries and a set \\(\\mathcal{F}\\) of functions, or codewords \\(f:Q\\rightarrow \\mathbb{Z}.\\) We think of this as a two-player game. One player, Codemaker, picks a hidden codeword \\(f\\in \\mathcal{F}\\). The other player, Codebreaker, then tries to determine \\(f\\) by asking a sequence of queries \\(q\\in Q\\), after each of which Codemaker must respond with the value \\(f(q)\\). The goal of Codebreaker is to uniquely determine \\(f\\) using as few queries as possible. Two classical examples of such games are coin-weighing with a spring scale, and Mastermind, which are of interest both as recreational games and for their connection to information theory.\nIn this paper, we will present a general framework for finding short solutions to query games. As applications, we give new self-contained proofs of the query complexity of variations of the coin-weighing problems, and prove new results that the deterministic query complexity of Mastermind with \\(n\\) positions and \\(k\\) colors is \\(\\Theta(n \\log k/ \\log n + k)\\) if only black-peg information is provided, and \\(\\Theta(n \\log k / \\log n + k/n)\\) if both black- and white-peg information is provided. In the deterministic setting, these are the first up to constant factor optimal solutions to Mastermind known for any \\(k\\geq n^{1-o(1)}\\).\n \nMathematics Subject Classifications: 91A46, 68Q11, 05B99\n \nKeywords: Combinatorial games, query complexity, Mastermind, coin-weighing",
    "language": "en",
    "license": {
        "name": "Creative Commons Attribution 4.0",
        "short_name": "CC BY 4.0",
        "text": "Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.\n\nNo additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.",
        "url": "https://creativecommons.org/licenses/by/4.0"
    },
    "keywords": [
        {
            "word": "Combinatorial games"
        },
        {
            "word": "query complexity"
        },
        {
            "word": "Mastermind"
        },
        {
            "word": "coin-weighing"
        }
    ],
    "section": "Research Articles",
    "is_remote": true,
    "remote_url": "https://escholarship.org/uc/item/5cb9m4f1",
    "frozenauthors": [
        {
            "first_name": "Anders",
            "middle_name": "",
            "last_name": "Martinsson",
            "name_suffix": "",
            "institution": "Department of Computer Science, ETH Zurich, Zurich, Switzerland",
            "department": ""
        }
    ],
    "date_submitted": "2023-09-14T08:30:48Z",
    "date_accepted": "2023-09-14T08:30:48Z",
    "date_published": "2023-09-15T07:00:00Z",
    "render_galley": null,
    "galleys": [
        {
            "label": "",
            "type": "pdf",
            "path": "https://journalpub.escholarship.org/combinatorial_theory/article/64907/galley/49717/download/"
        }
    ]
}