Dictionary best data structure for train routes?

Question

So I\'ve been tasked with essentially reading in a file (notepad file) that has a bunch of train stops and the time it takes to get from one stop to another. For example it

Answer 1

A Dictionary is a set of values stored by the hashes of a set keys. The advantage of using a dictionary is the time needed to locate a specific record regardless of size is fixed (often called O(1)). Alternatively if you used a list, the time needed to locate a record would be equal to the time it takes to read each element (often called O(n) where n equals the number of elements in the list).