#[derive(PartialEq, Eq, PartialOrd, Ord, Clone)]
pub struct Interval {
    pub start: u64,
    pub end: u64,
}

impl Interval {
    pub fn new(start: u64, end: u64) -> Interval {
        Interval { start, end }
    }

    pub fn contains(&self, value: u64) -> bool {
        self.start <= value && value <= self.end
    }

    pub fn len(&self) -> u64 {
        self.end - self.start + 1
    }
}