He/him hates knees. I like #cycling, #rowing, #walking, #photography, #maps, #programming in C, #electronics tinkering and #FipRadio. I pretend to like Italian #films but in reality they're French.
Indexing: #fedi22 #procycling #velophant #cyclocross #veldrijden #roeien #wandelen
Avatar is an #Ottifant, a cartoon elephant by German comedian Otto Waalkes.
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"Een behandeling op basis van een bekend verdovingsmiddel, lidocaïne, biedt verlichting bij mensen met langdurige klachten na Covid-19. Dat blijkt uit Nederlands onderzoek onder 103 patiënten die al 2,5 jaar kampten met postcovid."
I wrote an explainer for today's #AdventOfCode puzzle. It's a beam machine (cf. "bean machine") for Plinko!
RE: https://mastodon.social/@ednl/115679497619190696
Plinko! The one leap I needed was to keep track of all intermediate columns, compared to just the nodes on a hex grid of Pascal's Triangle.
Runs in only 10 µs on an Apple M4, or 29 µs on a Raspberry Pi 5 (internal timer, does not include reading from disk).
Pretty late again but this time because I kept tinkering with reading/parsing/data structures until I had one function for both parts. Looks elegant now, if I do say do myself :)
Consequently, it doesn't squeeze out every last microsecond but it's still plenty fast: 22 µs on an Apple M4, 79 µs on a Raspberry Pi 5.
Picture is my pivot function, full source at https://github.com/ednl/adventofcode/blob/main/2025/06.c
Still pretty chuffed about that function, by the way—I made it myself :)
Edit, crucial bit of info added in the comments: "array [...] must already be sorted in ascending order, first by .a then by .b"
Late today but not because of the puzzle. I knew I had my range-merging algorithm from AoC 2016 day 20 "Firewall Rules" and after sorting both the ranges and the IDs, matching them for part 1 was quick enough. After already having merged the ranges, part 2 was almost immediate!
Total program runs in 40 µs on an Apple M4, 70 µs on an M1, 134 µs on a RasPi 5 (internal timer, not including reading from disk, does include parsing).
In C: https://github.com/ednl/adventofcode/blob/main/2025/05.c
