Correct. Part 1: easy. Apply part 1 solution to example, works. Apply part 1 solution to real input, works. Part 2: hard to very hard. Apply part 2 solutio

Correct. Part 1: easy. Apply part 1 solution to example, works. Apply part 1 solution to real input, works. Part 2: hard to very hard. Apply part 2 solution to example, usually works. Apply part 2 solution to real input, doesn't work due to time / memory constraints. But having to look at the input to discover a pattern that isn't explained as part of the instructions always irks me.