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[package] |
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html |
||||
|
||||
[dependencies] |
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clap = "4.0.29" |
||||
@ -0,0 +1,58 @@
|
||||
use std::fs::File; |
||||
use std::io::BufRead; |
||||
use std::io::BufReader; |
||||
use std::io::Lines; |
||||
|
||||
use clap::Arg; |
||||
use clap::Command; |
||||
|
||||
struct Accumulator<B> { |
||||
lines: Lines<B>, |
||||
current: u32, |
||||
} |
||||
|
||||
trait Elvish<B> { |
||||
fn elf(self) -> Accumulator<B>; |
||||
} |
||||
|
||||
impl<B> Elvish<B> for Lines<B> { |
||||
fn elf(self) -> Accumulator<B> { |
||||
Accumulator { |
||||
lines: self, |
||||
current: 0, |
||||
} |
||||
} |
||||
} |
||||
|
||||
impl<B: BufRead> Iterator for Accumulator<B> { |
||||
type Item = u32; |
||||
|
||||
fn next(&mut self) -> Option<Self::Item> { |
||||
while let Some(Ok(line)) = self.lines.next() { |
||||
let line = line.trim(); |
||||
if line.is_empty() { |
||||
let result = self.current; |
||||
self.current = 0; |
||||
return Some(result); |
||||
} else { |
||||
self.current += line.parse::<u32>().unwrap(); |
||||
} |
||||
} |
||||
None |
||||
} |
||||
} |
||||
|
||||
fn main() { |
||||
let matches = Command::new("Day1").arg(Arg::new("filename")).get_matches(); |
||||
let filename = matches |
||||
.get_one::<String>("filename") |
||||
.expect("Need a filename"); |
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println!("Processing {}...", filename); |
||||
|
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let file = File::open(filename).expect("Can't read file"); |
||||
let reader = BufReader::new(file); |
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|
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let mut calories = reader.lines().elf().collect::<Vec<u32>>(); |
||||
calories.sort_by(|a, b| b.cmp(a)); |
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println!("Sum: {:?}", calories.iter().take(3).sum::<u32>()) |
||||
} |
||||
Loading…
Reference in new issue