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//! Iterate a digraph's outdegree sequence.
//!
//! # Examples
//!
//! ```
//! use graaf::{
//! AddArc,
//! AdjacencyList,
//! Empty,
//! OutdegreeSequence,
//! };
//!
//! let mut digraph = AdjacencyList::empty(3);
//!
//! digraph.add_arc(0, 1);
//! digraph.add_arc(0, 2);
//! digraph.add_arc(1, 2);
//! digraph.add_arc(2, 0);
//!
//! assert!(digraph.outdegree_sequence().eq([2, 1, 1]));
//! ```
use crate::{
Outdegree,
Vertices,
};
/// Digraph outdegree sequence
pub trait OutdegreeSequence {
/// Iterate the digraph's outdegree sequence.
///
/// # Examples
///
/// ```
/// use graaf::{
/// AddArc,
/// AdjacencyList,
/// Empty,
/// OutdegreeSequence,
/// };
///
/// let mut digraph = AdjacencyList::empty(3);
///
/// digraph.add_arc(0, 1);
/// digraph.add_arc(0, 2);
/// digraph.add_arc(1, 2);
/// digraph.add_arc(2, 0);
///
/// assert!(digraph.outdegree_sequence().eq([2, 1, 1]));
/// ```
#[must_use]
fn outdegree_sequence(&self) -> impl Iterator<Item = usize>;
}
impl<D> OutdegreeSequence for D
where
D: Outdegree + Vertices,
{
fn outdegree_sequence(&self) -> impl Iterator<Item = usize> {
self.vertices().map(move |v| self.outdegree(v))
}
}
/// `OutdegreeSequence` tests
#[macro_export]
macro_rules! test_outdegree_sequence {
($fixture:path) => {
use $fixture::{
bang_jensen_34,
bang_jensen_94,
bang_jensen_196,
kattis_builddeps,
kattis_cantinaofbabel_1,
kattis_cantinaofbabel_2,
kattis_escapewallmaria_1,
kattis_escapewallmaria_2,
kattis_escapewallmaria_3,
};
#[test]
fn outdegree_sequence_bang_jensen_196() {
assert!(
bang_jensen_196()
.outdegree_sequence()
.eq([3, 3, 1, 2, 1, 1, 1, 1])
);
}
#[test]
fn outdegree_sequence_bang_jensen_34() {
assert!(
bang_jensen_34().outdegree_sequence().eq([1, 1, 3, 0, 0, 1])
);
}
#[test]
fn outdegree_sequence_bang_jensen_94() {
assert!(
bang_jensen_94()
.outdegree_sequence()
.eq([2, 1, 4, 1, 1, 0, 0])
);
}
#[test]
fn outdegree_sequence_kattis_builddeps() {
assert!(
kattis_builddeps()
.outdegree_sequence()
.eq([2, 0, 3, 1, 1, 1])
);
}
#[test]
fn outdegree_sequence_kattis_cantinaofbabel_1() {
assert!(
kattis_cantinaofbabel_1()
.outdegree_sequence()
.eq([1, 3, 1, 6, 1, 1, 2, 1, 2, 2, 1, 1])
);
}
#[test]
fn outdegree_sequence_kattis_cantinaofbabel_2() {
assert!(
kattis_cantinaofbabel_2()
.outdegree_sequence()
.eq([1, 2, 3, 1, 1, 2, 1, 1, 3, 1, 2, 1])
);
}
#[test]
fn outdegree_sequence_kattis_escapewallmaria_1() {
assert!(
kattis_escapewallmaria_1()
.outdegree_sequence()
.eq([0, 0, 0, 0, 0, 2, 1, 0, 0, 2, 0, 0, 0, 2, 0, 0])
);
}
#[test]
fn outdegree_sequence_kattis_escapewallmaria_2() {
assert!(
kattis_escapewallmaria_2()
.outdegree_sequence()
.eq([0, 0, 0, 0, 0, 2, 1, 0, 0, 1, 0, 0, 1, 2, 0, 0])
);
}
#[test]
fn outdegree_sequence_kattis_escapewallmaria_3() {
assert!(
kattis_escapewallmaria_3()
.outdegree_sequence()
.eq([0, 2, 2, 0, 0, 3, 2, 0, 0, 2, 0, 0, 1, 2, 0, 0])
);
}
};
}