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IMO 2025 — Complete Shortlist Question 2

IMO Shortlist · IMO 2025 — Complete Shortlist

Question 2

The sunshine cost of a sequence $ a_{1}, a_{2}, \ldots, a_{100} $ of integers is the largest possible value of

$$ \left|\left(a_{1}+a_{2}+\cdots+a_{i}\right)-a_{j}\right| $$

as i and j vary over all integers 1,2,...,100.

Determine the smallest possible sunshine cost over all sequences $ a_{1}, a_{2}, \ldots, a_{100} $ of pairwise distinct integers.