use std::fs;
use std::io::{self, BufRead};

// fn subinterval(a0: i32, a1: i32, b0: i32, b1: i32) -> bool {
//     a0 <= b0 && b1 <= a1
// }

fn subcontained(a0: i32, a1: i32, b0: i32, b1: i32) -> bool {
    // subinterval(a0, a1, b0, b1) || subinterval(b0, b1, a0, a1)
    ((a0 - b0) * (a1 - b1)) <= 0
}

fn overlap(a0: i32, a1: i32, b0: i32, b1: i32) -> bool {
    a0 <= b1 && b0 <= a1
}

fn main() {
    let file = fs::File::open("input").unwrap();
    let lines = io::BufReader::new(file).lines();
    let mut subcont = 0;
    let mut overlaps = 0;
    for line in lines {
        let li = line.expect("line");
        if let [a0, a1, b0, b1] = li
            .split(&[',', '-'])
            .map(|x| x.parse::<i32>().unwrap())
            .collect::<Vec<i32>>()[..4]
        {
            if subcontained(a0, a1, b0, b1) {
                subcont += 1
            }
            if overlap(a0, a1, b0, b1) {
                overlaps += 1
            }
        } else {
            panic!("Bad line input")
        };
    }

    assert_eq!(515, subcont);
    assert_eq!(883, overlaps);
    println!("All test passed.")
}