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MathNet 2022-part-05 — 197 problems (EN–VI) Question 95

Math Olympiad Vault · MathNet 2022-part-05 — 197 problems (EN–VI)

Question 95

There are $2022$ distinct lattice points in the plane. Let $I$ be the number of pairs of these points whose distance is exactly $1$. Find the largest possible value of $I$.

Note: a lattice point is a point whose $x$-coordinate and $y$-coordinate are both integers.