How do I use std::vector in C++ for 2D arrays?

Can you explain how to use std::vector for creating a 2D array in C++?

Sure! You can create a 2D array using std::vector by declaring a vector of vectors. For example: std::vector<std::vector<int>> matrix;.

How do I initialize it with specific dimensions?

You can initialize it like this: std::vector<std::vector<int>> matrix(rows, std::vector<int>(cols)); where rows and cols are the dimensions.

What if I want to access an element in this 2D vector?

You can access an element using the syntax matrix[i][j], where i is the row index and j is the column index.

Can I resize the 2D vector after initializing it?

Yes, you can resize it using the resize method, like this: matrix.resize(new_rows, std::vector<int>(new_cols));.