Round-Trip Minimum Price

You are given a 2D array flights where flights[i] contains three integers [source, destination, price] representing a flight from source to destination with price. You are starting from city A and want to purchase a round-trip ticket, return the minimum cost of the round-trip ticket. Assume there is always a possible round-trip. Example Input 5 0 1 100 1 2 100 2 0 100 3 4 50 4 3 50