Killua and Magic Dungeon

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Killua is a famous adventurer. He likes to go through dungeons as fast as possible. A dungeon is represented as an NxM grid. When Killua enters the dungeon he has the choice of where he can start. He can choose any of the 'S' cells as his starting point. Cells with '.' indicate empty cells, through which Killua can pass and cells with 'X' indicate cells through which he can't. In one move, Kill

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solution.cppC++17

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