Advent of Code 2022
On this page, I’ll sum up daily my experience doing the Advent of Code 2022.
Day 1: Counting calories
That is the easy introduction day. Nothing much to say: Lists, doing sums. Then sorting, and picking 3 numbers.
for line in lines {
if line.is_empty() {
all_cals.push(current_cal);
current_cal = 0;
} else {
current_cal += line.parse::<i32>().expect("need a mumber");
}
}
all_cals.push(current_cal);
all_cals.sort();
all_cals.reverse();
I should refactor the sort & reverse calls. I’m pretty sure this could be a 1 liner…
Day 2: Paper, Scissors, Rock or Rock, Paper, Scissors or …
I was too lazy. I’ll be honest: I’ve written too much match in my solution. I should refactor the thing to do 0. But that was end of the week and I wanted to get a walk.
let playtype = match a {
Play::Rock => {
match b {
Play::Paper => Type::Loss,
Play::Scissors => Type::Win,
Play::Rock => Type::Draw,
}
},
Wah I’ve just seen this blog post with quite better parsing using try_from. I really should use those.
Day 3: Intersections
Today’s exercise was about doing intersections of sets. Well, rust happens to have a very nice collection type for this: HashSet. And it also happens that this HashSet type has an intersection function.
while groups.len() > 0 {
let inter = groups.pop().unwrap().intersection(&groups.pop().unwrap()).cloned().collect();
let inter: HashSet<char> = groups.pop().unwrap().intersection(&inter).cloned().collect();
for c in inter.iter() {
score_part2 += badge_to_number(*c);
}
}
All other exercises are on my Github account.