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ELMO 2025 Problem 2

    A contest has 20252025 problems. Elmo initially knows that the answers are 11 , 22 , …\dots , 20252025 in some order. Every minute, Elmo selects a problem that has not been answered correctly, inputs an answer to it, and is told whether the answer is correct or incorrect. Elmo wins the contest if and only if he answers all 20252025 problems correctly in at most 20242024 attempts each. Can Elmo guarantee that he wins the contest?

    Andrew Lin and Calvin Wang

    Dataset text AI-MO AoPS. Quoted with source.

    Official text: ELMO 2025 official paper, page 1.

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