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L ong/Nose :marseylongpost: Serial Serious Replyer :marseylongpost:  11mo ago (text post) Edited 11mo ago 1,275 thread views #225463

r/drama Advent of Code S02E01 - Official DISCUSSION Thread

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Took me a long time to remember to do this but I beat the release of day two :)

I bounced off haskell immediately and cbf re-learning from scratch so it's rust season again:

// line, head, tail, recursive
fn part2(line: String, first: Option<char>, last: Option<char>) -> String {
   let mut new_first = first;
   let mut new_last = last;

   if line.len() == 0 {
       return format!("{}{}", first.unwrap(), last.unwrap());
   } else {
       for p in [
           ("one", '1'),
           ("two", '2'),
           ("three", '3'),
           ("four", '4'),
           ("five", '5'),
           ("six", '6'),
           ("seven", '7'),
           ("eight", '8'),
           ("nine", '9'),
       ] {
           if line.starts_with(p.0) {
               if first.is_none() {
                   new_first = Some(p.1);
               }
               new_last = Some(p.1);
               break;
           }
       }

       let mut ln_new = line.chars();
       let c = ln_new.next().unwrap();
       if c.is_digit(10) {
           if first.is_none() {
               new_first = Some(c);
           }
           new_last = Some(c);
       }

       return part2(ln_new.collect(), new_first, new_last);
   }
}

fn main() {
   // Part One
   let lines = include_str!("input.txt").lines().collect::<Vec<_>>();
   let mut n = 0;
   for line in lines.clone() {
       let mut first: Option<char> = None;
       let mut last: Option<char> = None;
       for c in line.chars() {
           if c.is_digit(10) {
               if first.is_none() {
                   first = Some(c);
               }
               last = Some(c);
           }
       }

       n += format!("{}{}", first.unwrap(), last.unwrap())
           .parse::<i32>()
           .unwrap();
   }

   println!("Part 1: {}", n);

   // Part Two
   let mut m = 0;
   for line in lines {
       m += part2(line.to_string(), None, None).parse::<i32>().unwrap();
   }

   println!("Part 2: {}", m);
}
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You had a chance to not be completely worthless, but it looks like you threw it away. At least you're consistent.

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I have to say rust is less ugly than I thought it'd be. Why did they choose let var: Type = ... instead of just Type var = ...?

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Most of the time it will infer the type from what's passed in/used later, but yeah shit can get cluttered

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