Nim x Nim

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Gon and Killua love playing games. One day, they came across the game of [Nim](https://en.wikipedia.org/wiki/Nim), but soon got disinterested once they found the winning strategy. Thus they created a new game, “Nim x Nim”. The game is similar to single-pile Nim, except that in each turn, a player can take only 1 to $ceil(n/x)$ stones from the pile, where $n$ is the number of stones in the pile, $x

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solution.cppC++17

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