[//, This, is, a, database, with, distances, between, a, number]
[//, of, cities., The, cities, are, numbered, 0,, 1,, 2,, ...,, n-1.]
[//, The, first, lines, contains, the, integer, n,, i.e., the]
[//, number, of, cities., Each, following, line, contains, three]
[//, integers, i,, j,, and, d, separated, by, spaces., The, positive]
[//, number, d, is, the, distance, between, i, and, j.]
[6, , , , , , , , //, Size]