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use advent_lib::prelude::*;
use std::collections::BTreeSet;
fn main() -> Result<()> {
let mut args = std::env::args();
if args.len() != 2 {
eprintln!("Usage: advent input");
}
let _ = args.next();
let filename = args.next().unwrap();
let input = advent_lib::read_lines_file(&filename)?;
let mut yes_counts = Vec::new();
let mut yes_answers = BTreeSet::new();
for line in &input {
if line.trim().len() == 0 {
let count = yes_answers.len();
yes_counts.push(count);
yes_answers = BTreeSet::new();
}
for c in line.trim().chars() {
yes_answers.insert(c);
}
}
let count = yes_answers.len();
yes_counts.push(count);
let mut sum = 0;
for count in yes_counts {
sum += count;
}
println!("{}", sum);
let mut everyone_yes_counts = Vec::new();
let mut everyone_yes_answers = BTreeSet::new();
let mut is_within_group = false;
for line in &input {
let this_line_is_blank = line.trim().len() == 0;
if this_line_is_blank {
let count = everyone_yes_answers.len();
everyone_yes_counts.push(count);
//println!("{}", count);
everyone_yes_answers = BTreeSet::new();
is_within_group = false;
}
let mut this_person_yes_answers = BTreeSet::new();
for c in line.trim().chars() {
this_person_yes_answers.insert(c);
}
//println!("{} {}", everyone_yes_answers.len(), this_person_yes_answers.len());
if is_within_group {
let intersection =
everyone_yes_answers.intersection(&this_person_yes_answers);
let mut copied = BTreeSet::new();
for c in intersection {
copied.insert(c.clone());
}
everyone_yes_answers = copied;
} else {
everyone_yes_answers = this_person_yes_answers;
}
is_within_group = !this_line_is_blank;
}
let count = everyone_yes_answers.len();
everyone_yes_counts.push(count);
let mut everyone_sum = 0;
for count in everyone_yes_counts {
everyone_sum += count;
}
println!("{}", everyone_sum);
Ok(())
}
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