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MathNet 2023-part-01 — 191 problems (EN–VI) Question 59

Math Olympiad Vault · MathNet 2023-part-01 — 191 problems (EN–VI)

Question 59

Find the greatest integer $k \le 2023$ for which, regardless of how Alice colors exactly $k$ numbers among $\{1, 2, \dots, 2023\}$ in red, Bob can color some of the remaining uncolored numbers in blue, such that the sum of the red numbers is the same as the sum of the blue ones.