C++: std::deque vs std::vector

What are the main differences between std::deque and std::vector in C++?

The main differences are in memory allocation and performance. std::vector is faster for random access, while std::deque allows efficient insertions and deletions at both ends.

When should I use std::deque instead of std::vector?

Use std::deque when you need to frequently add or remove elements from both ends of the container. It's more efficient for those operations.

Are there any downsides to using std::deque?

Yes, std::deque may have slightly slower random access compared to std::vector due to its underlying structure, which can affect performance in some scenarios.

Can you give an example of when to choose std::vector?

Choose std::vector when you need fast access to elements and don't require frequent insertions or deletions at the front. It's ideal for dynamic arrays.