How do I use 2D vectors in C++ STL?

Can you explain how to create and use 2D vectors in C++ STL?

Sure! In C++, you can create a 2D vector using std::vector<std::vector<int>>. This allows you to create a vector of vectors.

How do I initialize a 2D vector with specific dimensions?

You can initialize it like this: std::vector<std::vector<int>> vec(rows, std::vector<int>(cols)); This creates a 2D vector with 'rows' and 'cols'.

What if I want to fill it with specific values?

You can use a loop to fill it, or initialize it with a value like this: std::vector<std::vector<int>> vec(rows, std::vector<int>(cols, value));.

Can you show me an example of accessing elements in a 2D vector?

Certainly! You can access elements using vec[i][j], where 'i' is the row index and 'j' is the column index.