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