I was expecting a horror story about some leet code problem. It's been 5 years since I last interviewed, but I always memorized how to write the common sort algorithms ahead of time first. Having to write merge sort in C doesn't really feel like a big ask. I don't know, maybe I'm old fashioned. Even if we pretend people don't spend months training on leetcode before interviews nowadays, surely sorting algorithms are still taught in basic data structures classes, right?