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VN-TST 2022 Problem 6

    Given a set A={1;2;...;4044}A=\{1;2;...;4044\} . They color 20222022 numbers of them by white and the rest of them by black. With each i∈Ai\in A , called the important number of ii be the number of all white numbers smaller than ii and black numbers larger than ii . With every natural number mm , find all positive integers kk that exist a way to color the numbers that can get kk important numbers equal to mm .

    Dataset text AI-MO AoPS. Quoted with source.

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