day03: Add part 1 solution

This commit is contained in:
MasterofJOKers 2022-12-16 18:33:33 +01:00
parent 7b82a1f46b
commit 55038c87da
3 changed files with 45 additions and 0 deletions

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day03/Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "day03"
version = "0.1.0"

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day03/Cargo.toml Normal file
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[package]
name = "day03"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]

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day03/src/main.rs Normal file
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use std::collections::HashSet;
use std::error;
use std::fs::File;
use std::io::BufRead;
use std::io::BufReader;
fn set_from_str(chars: &str) -> HashSet<u32> {
HashSet::from_iter(chars.chars().map(|c| if c.is_uppercase() { c as u32 - 38 } else { c as u32 - 96 }))
}
fn main() -> Result<(), Box<dyn error::Error>> {
let f = File::open("input.txt")?;
let reader = BufReader::new(f);
let mut sum: u32 = 0;
for line in reader.lines() {
let line = line?;
let (c1, c2) = line.split_at(line.len() / 2);
let c1_set = set_from_str(c1);
let c2_set = set_from_str(c2);
sum += c1_set.intersection(&c2_set).sum::<u32>();
}
println!("{}", sum);
Ok(())
}