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#![feature(iter_next_chunk)]
use std::collections::HashSet;
fn main() {
part1();
part2();
}
fn part1() {
let input = include_str!("../input");
let ans: u32 = input.lines().map(|line| {
let first = &line[..line.len()/2];
let second = &line[line.len()/2..];
let first: HashSet<char> = first.chars().collect();
let second: HashSet<char> = second.chars().collect();
let common = *first.intersection(&second).next().unwrap();
let priority = match common {
'a'..='z' => 1 + common as u32 - 'a' as u32,
'A'..='Z' => 27 + common as u32 - 'A' as u32,
_ => unreachable!(),
};
priority
}).sum();
println!("{}", ans);
}
fn part2() {
let input = include_str!("../input");
let mut lines = input.lines();
let mut sum = 0;
while let Ok([first, second, third]) = lines.next_chunk::<3>() {
let first: HashSet<char> = first.chars().collect();
let second: HashSet<char> = second.chars().collect();
let third: HashSet<char> = third.chars().collect();
let common = *first
.intersection(&second)
.copied()
.collect::<HashSet<char>>()
.intersection(&third)
.next()
.unwrap();
let priority = match common {
'a'..='z' => 1 + common as u32 - 'a' as u32,
'A'..='Z' => 27 + common as u32 - 'A' as u32,
_ => unreachable!(),
};
sum += priority;
}
println!("{}", sum);
}
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