use std::usize;


pub fn calculate_time(discs: &Vec<(usize, usize)>) -> Result<usize, ()> {
    'main: for t in 0..usize::MAX {
        for (i, &(p, m)) in discs.iter().enumerate() {
            if (t + i + 1 + p) % m != 0 {
                continue 'main;
            }
        }

        return Ok(t);
    }

    Err(())
}


fn main() {
    let time_1 = calculate_time(&vec![
        (2, 5),
        (7, 13),
        (10, 17),
        (2, 3),
        (9, 19),
        (0, 7)
    ]);

    println!("time_1={:?}", time_1);

    let time_2 = calculate_time(&vec![
        (2, 5),
        (7, 13),
        (10, 17),
        (2, 3),
        (9, 19),
        (0, 7),
        (0, 11)
    ]);

    println!("time_2={:?}", time_2);
}


#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn example_01() {
        assert_eq!(Ok(5), calculate_time(&vec![(4, 5), (1, 2)]));
    }
}