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MathNet 2023-part-07 — 187 problems (EN–VI) Question 173

Math Olympiad Vault · MathNet 2023-part-07 — 187 problems (EN–VI)

Question 173

There are 2022 equally spaced points on a circular track $\gamma$ of circumference 2022. The points are labeled $A_1, A_2, \dots, A_{2022}$ in some order, each label used once. Initially, Bunbun the Bunny begins at $A_1$. She hops along $\gamma$ from $A_1$ to $A_2$, then from $A_2$ to $A_3$, until she reaches $A_{2022}$, after which she hops back to $A_1$. When hopping from $P$ to $Q$, she always hops along the shorter of the two arcs $\overarc{PQ}$ of $\gamma$; if $\overarc{PQ}$ is a diameter of $\gamma$, she moves along either semicircle.
Determine the maximal possible sum of the lengths of the 2022 arcs which Bunbun traveled, over all possible labellings of the 2022 points.