O(1) in many cases involves a hashing function which is a non-trivial but constant cost. For smaller values of N it can be outperformed in terms of wall clock time by n^2 worst case algorithms.
- Writing groups. They often have sessions that provide feedback and also help writers find/build a sense of community. Your son would also get to listen to other writers talk about their work, problems they’ve run into and overcome, and other aspects of their craft.
- School (sometimes library) writing workshops. This helps students develop bonds with their peers and helps both students: the ones giving feedback are learning to be better editors.
Both of these offer a lot of value in terms of community building and also getting feedback from people vested in the the craft of writing.
That's AI.
[1] but I am not just a rhetorician!