TUYMAADA 2008 J3
100 unit squares of an infinite squared plane form a square. Unit segments forming these squares are coloured in several colours. It is known that the border of every square with sides on grid lines contains segments of at most two colours. (Such square is not necessarily contained in the original square.) What maximum number of colours may appear in this colouring?
Author: S. Berlov
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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