How do I initialize a 2D vector in C++11?

How do I initialize a 2D vector in C++11?

You can initialize a 2D vector in C++11 using the following syntax: std::vector<std::vector<int>> vec(rows, std::vector<int>(cols));.

Can you show me an example with specific values?

Sure! For example, to create a 2D vector with 3 rows and 4 columns initialized to 0, you can do: std::vector<std::vector<int>> vec(3, std::vector<int>(4, 0));.

What if I want to initialize it with different values?

You can do that by specifying the values in a nested initializer list like this: std::vector<std::vector<int>> vec = {{1, 2, 3}, {4, 5, 6}};.

Is there a way to resize the vector later?

Yes, you can resize a 2D vector using the resize method. For example, vec.resize(new_rows, std::vector<int>(new_cols)); will change its size.