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arXiv · 2104.01664

On the R\'enyi-Ulam Game with Restricted Size Queries

Ádám Fraknói·Dávid Márton·Dániel Simon·Dániel Lenger
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Abstract

We investigate the following version of the well-known R\'enyi-Ulam game. Two players - the Questioner and the Responder - play against each other. The Responder thinks of a number from the set $\{1,\ldots,n\}$, and the Questioner has to find this number. To do this, he can ask whether a chosen set of at most $k$ elements contains the thought number. The Responder answers with YES or NO immediately, but during the game, he may lie at most $\ell$ times. The minimum number of queries needed for the Questioner to surely find the unknown element is denoted by $RU_\ell^k(n)$. First, we develop a highly effective tool that we call Convexity Lemma. By using this lemma, we give a general lower bound of $RU_\ell^k(n)$ and an upper bound which differs from the lower one by at most $2\ell+1$. We also give its exact value when $n$ is sufficiently large compared to $k$. With these, we managed to improve and generalize the results obtained by Meng, Lin, and Yang in a 2013 paper about the case $\ell=1$.

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Ádám Fraknói, Dávid Márton, Dániel Simon, Dániel Lenger. 2021-04-04. On the R\'enyi-Ulam Game with Restricted Size Queries. https://doi.org/10.1016/j.disopt.2023.100772

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