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I made this jupyter notebook for a better idea and to directly compare different grid serial numbers. I think the condition "stop when no new max has been found twice in a row" will work most of the time. I tested a few other serial numbers and it seemed OK: the condition is only true directly AFTER the absolute maximum. But yes, there could well be other serial numbers where there is a dip of length 2 BEFORE the absolute maximum. Screenshot of the graph from the notebook: https://i.imgur.com/VXXpZnh.png
Since Christmas I've slowly been going through the past events (in reverse chronological order). For me half of the fun was building up my Utilities library, which many solutions took full advantage of. My repo can be found on GitHub here. My README contains my 6 favorite puzzles from every year.
Hello fellow C# 400 star club member! :) Feel free to check out my repo as well
My own (still growing) C# repo.