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

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

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

Can you explain what rows and cols represent?

Sure! rows is the number of rows in the 2D vector, and cols is the number of columns.

How do I access an element in this 2D vector?

You can access an element using vec[row][col], where row is the index of the row and col is the index of the column.

What if I want to initialize all elements to zero?

You can initialize all elements to zero by using std::vector<std::vector<int>> vec(rows, std::vector<int>(cols, 0));.