Are you maybe confusion the maps keys with its values? In your case `pair` is the keys and `vector>` is the values. If you want to know the size of the `pair`s you should clarify what you mean with size of that pairs. However I guess you want to know the sizes (possibly accumulated?) of the vectors, right?
– 463035818_is_not_an_aiOct 25 '16 at 15:16