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RU-ALLRUSSIAN 2023 Problem 115

  • Grade 11

Initially, 1010 ones are written on a blackboard. Grisha and Gleb are playing game, by taking turns; Grisha goes first. On one move Grisha squares some 55 numbers on the board. On his move, Gleb picks a few (perhaps none) numbers on the board and increases each of them by 11 . If in 10,00010,000 moves on the board a number divisible by 20232023 appears, Gleb wins, otherwise Grisha wins. Which of the players has a winning strategy?

Dataset text AI-MO AoPS. Quoted with source.

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