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everyone welcome back and let's write some more neat code today so today let's solve the problem reconstruct itinerary this is a pretty difficult problem but it's doable if you have a good understanding of graphs and graph traversals especially dfs which we're going to be using in this problem but we're given a list of airline tickets and these tickets are basically a graph edge we have a from and a two so basically a source and a destination and it connects two nodes together in this case the nodes are going to represent airports or cities and basically using this list of tickets we want to reconstruct the itinerary and basically what that means is we want to reconstruct the flight history of a person who had this list of tickets all of the tickets belong to someone who departed from jfk so no matter what this is going to be our starting edge in our graph so basically if you take a look at this picture we're always going to be starting at jfk so we're pretty much guaranteed that jfk...