DK-GEORGMOHR 2020 Problem 5
Alma places spies on some of the squares on a game board. Now Bertha secretly chooses a quadradic area consisting of squares and tells Alma which spies are standing on a square in the secret quadradic area. At least how many spies must Alma have placed in order for her to determine with certainty which area Bertha has chosen?
Dataset text AI-MO AoPS. Quoted with source.
Official text: Georg Mohr Contest 2020 official paper, page 1.
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