GRAPH - Total paths

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There is a man standing in front of a market, 1 represent filled area and 0 represents road. In how many ways can he visit all roads (0s), you have to print that. He cannot move through 1s, but he can move through 0s. There won't be any loops in the paths of 0s. Two paths are different if at any of the point of intersection of two roads he takes a different direction. He can revisit a road (0 or 0

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solution.cppC++17

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