#AdventOfCode #Day7 with #rust
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#AdventOfCode #Day7 with #rust
pretty straightforward, but I hit a weird issue: I cannot use a loca variable for a row of my grid while iterating, otherwise it complains I'm mixing mutable and immutable borrowings.
And yet, using an index directly makes the compiler happy? Why?
I suspect the indexing is hiding stuff, and the fact this compiles means "this may explode at runtime, idk" and not "this will work fine".https://gist.github.com/riffraff/05bbbf38100697d88410534238f43c55
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#AdventOfCode #Day7 with #rust
pretty straightforward, but I hit a weird issue: I cannot use a loca variable for a row of my grid while iterating, otherwise it complains I'm mixing mutable and immutable borrowings.
And yet, using an index directly makes the compiler happy? Why?
I suspect the indexing is hiding stuff, and the fact this compiles means "this may explode at runtime, idk" and not "this will work fine".https://gist.github.com/riffraff/05bbbf38100697d88410534238f43c55
mh, if claude is to be believed, the index one works cause we have a single-expression borrow of the value in grid[nrow] followed by a _copy_ of the value in grid[nrow][ncol].
I am not sure this is true, but I've learned that indices work and that is good enough for now. -
#AdventOfCode #Day7 with #rust
pretty straightforward, but I hit a weird issue: I cannot use a loca variable for a row of my grid while iterating, otherwise it complains I'm mixing mutable and immutable borrowings.
And yet, using an index directly makes the compiler happy? Why?
I suspect the indexing is hiding stuff, and the fact this compiles means "this may explode at runtime, idk" and not "this will work fine".https://gist.github.com/riffraff/05bbbf38100697d88410534238f43c55
@riffraff Fascinating. I didn’t make a grid at all. Instead for part 1 I just maintained a hash set of ints where there was a tachyon, and then just iterated through each line and created two new ones whenever there was an overlap with the splitters.
Second part I used a dfs-inspired approach with memoization/dynamic programming.
https://github.com/teotwaki/aoc/blob/main/2025/07/src/lib.rs
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@riffraff Fascinating. I didn’t make a grid at all. Instead for part 1 I just maintained a hash set of ints where there was a tachyon, and then just iterated through each line and created two new ones whenever there was an overlap with the splitters.
Second part I used a dfs-inspired approach with memoization/dynamic programming.
https://github.com/teotwaki/aoc/blob/main/2025/07/src/lib.rs
@teotwaki I used a hash in my ruby version for part 2, but I didn't think of the DFS/DP idea, nice
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@maddmaths è sempre colpa della matematica, ovvio.
Poi potrei però citare Rob Eastaway, che oggi ha scritto su Twitter
In her @SparxMaths
homework, I watch a GCSE pupil being asked to expand the expression (3x + 5)^4 . So she doesn't cheat with AI she has to answer correctly online AND write out all her workings on paper. Sorry, this isn't maths, it's 5 minutes of pointless number-crunching.
(And she finds it mind-numbingly dull.)Come dare loro torto?
Cc: @matematica
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@ALFA eh sì.. è dello scorso anno..
buona serata 🌌
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foto: Ugo Mulas, Il laboratorio, una mano sviluppa l’altra fissa. Dal volume Ugo Mulas, Federico Motta Editore, 1989
Ugo Mulas (Pozzolengo, 1928 – Milan, 1973) was an Italian photographer.
Mulas immersed himself in Milan’s artistic scene of the 1950s, frequenting the Jamaica Bar, a gathering place for intellectuals and artists. His career took off in 1954 when he began photographing the Venice Biennale ... https://cctm.website/ugo-mulas-italia/
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@adriananselmo @versodiverso @floreana forse, ma sono solo pensieri, manca un “movimento”, un “manifesto” comune da seguire, in cui riconoscersi. Senza leader, dove ognuno è portatore d’interesse… mi rendo conto che suona quasi utopia…qualcosa da umani molto evoluti visto che molto si gioca sulla responsabilità individuale. Perché ora siamo frammentati. Qualcosa di trasversale che tocchi temi che abbiano le caratteristiche di scalzare il passato.
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@simonett_a
OK!
Però questo è già completo.
Vabbè... 👍👍
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People who speak in superlatives are liars.
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In which period was the music you listen to recorded and/or released? Choose all that apply.
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@ALFA grazie!
c'è anche una alternativa all' #AvventodiAllegria
sempre attuale.. #AvventodiPace ↙️
https://mastodon.uno/@simonett_a/113579445415757930
