How do I find the size of a 2D vector in C++?

How do I find the size of a 2D vector in C++?

You can use the size() method to get the number of rows in a 2D vector and size() on the first row to get the number of columns.

Can you show me an example code snippet?

Sure! Here's a simple example:

#include <iostream>
#include <vector>

int main() {
    std::vector<std::vector<int>> vec = {{1, 2, 3}, {4, 5, 6}};
    std::cout << "Rows: " << vec.size() << std::endl;
    std::cout << "Columns: " << vec[0].size() << std::endl;
    return 0;
}

What if the inner vectors have different sizes?

In that case, vec.size() will still give you the number of rows, but vec[0].size() will only give you the size of the first inner vector. You should check each inner vector's size individually.