If I use vector class's functions to search my data, could you tell
me how I will know how fast its predefined algorithms will be. In order to be more precise about what I mean, if we, for instance, write a certain kind of algorithm to perform the searching task, we can compute the time taken for its performance, something like T(n^2) or T(nlogn),etc, but if it is already defined functions, how can we compute it ?

Thank you very much...
Regards,
Nina.