MathDB
Problem 6

Source: 239-School Open Olympiad (Senior Level)

April 25, 2022
combinatoricshatColors239

Problem Statement

239239 wise men stand in a circle near an opaque baobab. The king put on the head of each of these wise men a hat og one of 1616 colors. Each wise men does nor know the color of his hat and can only see the two nearest wise men on each side around the circle. Without communicating, these wise men must at the same time make a guess about the color of their hat ((i.e, tell one color)). These wise men were allowed to consult in advance, while they are afraid of being too lucky. What is the maximum kk for which, in any arrangement of hats, they can certainly ensure that no more than kk wise men guess the color of their hats??