What are some advanced techniques for using vectors in C++?

What are some advanced techniques for using vectors in C++?

Some advanced techniques include using vector of vectors, custom comparators, and leveraging algorithms from the STL.

Can you explain how to use a vector of vectors?

Sure! A vector of vectors allows you to create a 2D array-like structure. You can declare it as std::vector<std::vector<int>> matrix; and access elements using matrix[i][j].

What about using custom comparators with vectors?

Custom comparators can be used with std::sort to sort vectors based on specific criteria. You define a function or a lambda that specifies the sorting logic.

Can you give an example of a custom comparator?

Certainly! Here's a simple example: std::sort(vec.begin(), vec.end(), [](int a, int b) { return a > b; }); This sorts the vector in descending order.