What are some common errors when using 2D vectors in C++11?

What are some common errors when using 2D vectors in C++11?

Some common errors include incorrect initialization, accessing out-of-bounds elements, and forgetting to include the necessary headers.

Can you explain how to properly initialize a 2D vector?

Sure! You can initialize a 2D vector like this: std::vector<std::vector<int>> vec(rows, std::vector<int>(cols));.

What happens if I try to access an out-of-bounds element?

Accessing an out-of-bounds element can lead to undefined behavior, which may cause your program to crash or produce incorrect results.

How can I check if an index is valid before accessing it?

You can check if the index is within bounds by comparing it to the size of the vector: if (i < vec.size() && j < vec[i].size()) { /* safe to access */ }.