Julio Biason 2 years ago
parent
commit
f9011f7ca7
  1. 231
      day2/Cargo.lock
  2. 9
      day2/Cargo.toml
  3. 58
      day2/src/main.rs

231
day2/Cargo.lock generated

@ -0,0 +1,231 @@
# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
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9
day2/Cargo.toml

@ -0,0 +1,9 @@
[package]
name = "day2"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
clap = "4.0.29"

58
day2/src/main.rs

@ -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");
println!("Processing {}...", filename);
let file = File::open(filename).expect("Can't read file");
let reader = BufReader::new(file);
let mut calories = reader.lines().elf().collect::<Vec<u32>>();
calories.sort_by(|a, b| b.cmp(a));
println!("Sum: {:?}", calories.iter().take(3).sum::<u32>())
}
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