Filling the maze

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Consider a maze like this one, encoded in ASCII as a grid of R by C cells, denoted by characters # (a wall) and o (a walkable cell). The top left cell of the maze is the start and the bottom right one is the goal. All walkable cells are initially white. Cell B is reachable from cell A iff A and B are both walkable and it's possible to get to B by starting at A and moving only to walkable cells in

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solution.cppC++17

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