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For challenges involving data on a hexagonal grid. Use this tag also for triangular grids, the dual of the hexagonal grid (that is, the vertices of the hexagonal grid form the faces of the triangular grid and vice versa).
3
votes
Hexagonal adjacency
05AB1E (legacy), 30 29 27 bytes
α2‹i1q}1ݹ+v12y*3-tîÌy+}Ÿ²å
Try it online!
Explanation of code:
α2‹i1q} : if the absolute diff of the two number is 1 or 0 return 1
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