KURSCHAK 2020 Problem 3
There are houses in a city. Every Christmas, Santa visits these houses in some order. Show that if is large enough, then it holds that for three consecutive years there are always are houses such that they have been visited in the same order for two years (out of the three consecutive years). Determine the smallest for which this holds.
Dataset text AI-MO AoPS. Quoted with source.
Solutions
No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.
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