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RU-ALLRUSSIAN 2023 Problem 113

  • Grade 11

In every row of a grid 100×n100 \times n is written a permutation of the numbers 1,2…,1001,2 \ldots, 100. In one move you can choose a row and swap two non-adjacent numbers with difference 11. Find the largest possible nn, such that at any moment, no matter the operations made, no two rows may have the same permutations.

Dataset text AoPS wiki problems. Quoted with source.

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