int-interval-stack 0.3.1

Integer half-open interval stack structures for overlap multiplicity.
Documentation 
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use std::collections::BTreeSet;

use crate::int_co_stack::test_support::naive_height_at;

use super::*;

pub(crate) fn cp(at: i32, height_after: usize) -> ChangePoint<i32> {
    ChangePoint { at, height_after }
}

pub(crate) fn oracle_points(intervals: &[(i32, i32)]) -> Vec<ChangePoint<i32>> {
    let ats: BTreeSet<i32> = intervals.iter().flat_map(|&(s, e)| [s, e]).collect();
    let mut prev = 0usize;
    let mut out = Vec::new();

    for at in ats {
        let next = naive_height_at(intervals, at);
        if next != prev {
            out.push(ChangePoint {
                at,
                height_after: next,
            });
            prev = next;
        }
    }

    out
}