smallest no of 3-cell to point a 5x5 square, painting at most 1 corner
Source: Caucasus 2015 10.3
April 26, 2019
combinatoricscombinatorial geometryTilingtiles
Problem Statement
What is the smallest number of -cell corners that you need to paint in a square so that you cannot paint more than one corner of one it? (Shaded corners should not overlap.)