Question

I have a nested vector of strings like:

std::vector<std::vector<string>>

I want to access eight element of inner vector which is itself second element of outer vector.

Answer 1

Just as you would with a two-dimensional array:

std::vector<std::vector<std::string>> vec;
// Fill it
std::cout << vec[1][7] << std::endl;

If you want bounds checking, use std::vector::at:

std::cout << vec.at(1).at(7) << std::endl;

Note that the indices are 1 and 7 because indexing starts at 0.