use std::collections::HashMap;

#[cfg(debug_assertions)]
const FILENAME: &str = "example.txt";
#[cfg(not(debug_assertions))]
const FILENAME: &str = "input.txt";

fn main() {
    let binding = std::fs::read_to_string(FILENAME).unwrap();
    let data: Vec<_> = binding.lines().collect();

    part1(&data);
    part2(&data);
}

fn part2(data: &[&str]) {
    let mut counts = vec![HashMap::new(); data[0].len()];

    for message in data {
        message.chars().enumerate().for_each(|(idx, c)| {
            counts[idx].entry(c).and_modify(|i| *i += 1).or_insert(1);
        });
    }

    for count in counts {
        let the_char = count
            .iter()
            .min_by_key(|(_, val)| **val)
            .map(|(c, _)| c)
            .unwrap();

        print!("{the_char}");
    }
    println!();
}

fn part1(data: &[&str]) {
    let mut counts = vec![HashMap::new(); data[0].len()];

    for message in data {
        message.chars().enumerate().for_each(|(idx, c)| {
            counts[idx].entry(c).and_modify(|i| *i += 1).or_insert(1);
        });
    }

    for count in counts {
        let the_char = count
            .iter()
            .max_by_key(|(_, val)| **val)
            .map(|(c, _)| c)
            .unwrap();

        print!("{the_char}");
    }
    println!();
}