use std::{
    fs::File,
    io::{BufRead, BufReader},
};

struct Pair {
    low: i32,
    high: i32,
}

impl Pair {
    fn new(input: &str) -> Self {
        let tmpvec = input
            .split('-')
            .map(|val| val.parse::<i32>().unwrap())
            .collect::<Vec<_>>();
        return Self {
            low: tmpvec[0],
            high: tmpvec[1],
        };
    }

    fn contains_fully(self: &Self, other: &Self) -> bool {
        self.low <= other.low && self.high >= other.high
    }
}

fn main() -> () {
    let path = "input.txt";

    let input = File::open(path).unwrap();
    let buf = BufReader::new(input);

    let score: i32 = buf
        .lines()
        .map(|line| {
            let line = line.unwrap();
            let pairs = line
                .split(',')
                .map(|pair_str| Pair::new(pair_str))
                .collect::<Vec<_>>();
            pairs[0].contains_fully(&pairs[1]) || pairs[1].contains_fully(&pairs[0])
        })
        .map(|b| if b { 1 } else { 0 })
        .sum();

    println!("{}", score);
}