Y by Mango247, Mango247, Mango247
A sequence
consisting of pairwise different cells of an
board is called a cycle if
and cell ai shares a side with cell
for every
, where
. We will say that a subset
of the set of cells of a board is malicious if every cycle on the board contains at least one cell belonging to
. Determine all real numbers
with the following property: for every integer
on an
board there exists a malicious set containing at most
cells.











