Ciel and Earthquake

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The country in which Chef Ciel lives has many earthquakes. Since Ciel's restaurant is far away from an evacuation center, Ciel is afraid of earthquakes. So, Ciel would like to know the probability that Ciel can reach from Ciel's restaurant to the evacuation center when an earthquake occurs. Your task is calculating the probability under the following assumptions. Ciel's city has R*C junctions

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solution.cppC++17

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