porting over AOC from previous years to a monorepo.

2023/aoc_libs/src/distances.rs

@@ -0,0 +1,3 @@
+pub trait Distances{
+    fn taxicab_distance(&self, other: &Self)->usize;
+}

2023/aoc_libs/src/lib.rs

@@ -0,0 +1,4 @@
+pub mod points;
+pub mod range;
+pub mod misc;
+pub mod distances;

2023/aoc_libs/src/misc.rs

@@ -0,0 +1,43 @@
+pub fn arr_lcm(input: &[usize]) -> usize {
+    input.iter().copied().reduce(lcm).unwrap_or(0)
+}
+
+pub fn lcm(first: usize, second: usize) -> usize {
+    first * second / gcd(&first, &second)
+}
+
+pub fn gcd(a: &usize, b: &usize) -> usize {
+    let mut a = *a;
+    let mut b = *b;
+    while b != 0 {
+        let tmp = b;
+        b = a.rem_euclid(b);
+        a = tmp;
+    }
+    a
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_arr_lcm() {
+        assert_eq!(arr_lcm(&[4, 6]), 12);
+        assert_eq!(arr_lcm(&[5, 2]), 10);
+        assert_eq!(arr_lcm(&[5, 2, 6]), 30);
+        assert_eq!(arr_lcm(&[5, 2, 6, 3]), 30);
+    }
+
+    #[test]
+    fn test_lcm() {
+        assert_eq!(lcm(4, 6), 12);
+        assert_eq!(lcm(5, 2), 10);
+    }
+
+    #[test]
+    fn test_gcd() {
+        assert_eq!(gcd(&8, &12), 4);
+        assert_eq!(gcd(&54, &24), 6);
+    }
+}

2023/aoc_libs/src/points.rs

@@ -0,0 +1,229 @@
+use crate::distances::Distances;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default, Hash)]
+pub struct Point {
+    pub x: isize,
+    pub y: isize,
+}
+
+impl Point {
+    /// converts a point (representing a point on a 4 quadrant grid with positive xy in the
+    /// top-right) into a upoint (representing a point on a 1 quadrant grid with the origin in the
+    /// top-left corner). Returns none if the resulting point would have either number negative.
+    pub fn to_upoint(self, zero_coord: &UPoint) -> Option<UPoint> {
+        Some(UPoint {
+            x: zero_coord.x.checked_add_signed(self.x)?,
+            y: zero_coord.y.checked_add_signed(-self.y)?,
+        })
+    }
+}
+
+impl Distances for Point {
+    fn taxicab_distance(&self, other: &Self) -> usize {
+        self.x.abs_diff(other.x) + self.y.abs_diff(other.y)
+    }
+}
+
+impl std::ops::Add for Point {
+    type Output = Point;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self {
+            x: self.x + rhs.x,
+            y: self.y + rhs.y,
+        }
+    }
+}
+
+impl std::ops::AddAssign for Point {
+    fn add_assign(&mut self, rhs: Self) {
+        *self = *self + rhs
+    }
+}
+
+impl std::ops::Sub for Point {
+    type Output = Point;
+
+    fn sub(self, rhs: Self) -> Self::Output {
+        Self {
+            x: self.x - rhs.x,
+            y: self.y - rhs.y,
+        }
+    }
+}
+
+impl std::ops::SubAssign for Point {
+    fn sub_assign(&mut self, rhs: Self) {
+        *self = *self - rhs
+    }
+}
+
+impl std::ops::Neg for Point {
+    type Output = Point;
+
+    fn neg(self) -> Self::Output {
+        Point {
+            x: -self.x,
+            y: -self.y,
+        }
+    }
+}
+
+/// an unsigned point in 2d space
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct UPoint {
+    pub x: usize,
+    pub y: usize,
+}
+
+impl UPoint {
+    /// converts a upoint (representing a point on a 1 quadrant grid with the origin in the
+    /// top-left corner) into a point( representing a point on a 4 quadrant grid with positive xy
+    /// in the top-right)
+    pub fn to_point(self, zero_coord: &UPoint) -> Point {
+        Point {
+            x: -(zero_coord.x as isize - self.x as isize),
+            y: zero_coord.y as isize - self.y as isize,
+        }
+    }
+}
+
+impl Distances for UPoint {
+    fn taxicab_distance(&self, other: &Self) -> usize {
+        self.x.abs_diff(other.x) + self.y.abs_diff(other.y)
+    }
+}
+
+impl std::ops::Add for UPoint {
+    type Output = UPoint;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self {
+            x: self.x + rhs.x,
+            y: self.y + rhs.y,
+        }
+    }
+}
+
+impl std::ops::AddAssign for UPoint {
+    fn add_assign(&mut self, rhs: Self) {
+        *self = *self + rhs
+    }
+}
+
+impl std::ops::Sub for UPoint {
+    type Output = UPoint;
+
+    fn sub(self, rhs: Self) -> Self::Output {
+        Self {
+            x: self.x - rhs.x,
+            y: self.y - rhs.y,
+        }
+    }
+}
+
+impl std::ops::SubAssign for UPoint {
+    fn sub_assign(&mut self, rhs: Self) {
+        *self = *self - rhs
+    }
+}
+
+/// A matrix that allows negative co-oordinates. Will panic if referencing out of bounds, just like
+/// a normal 2d array.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct FourQuadrantMatrix<const X: usize, const Y: usize, T> {
+    matrix: [[T; X]; Y],
+    max_point: Point,
+    min_point: Point,
+    zero_coord: UPoint,
+}
+
+impl<const X: usize, const Y: usize, T> FourQuadrantMatrix<{ X }, { Y }, T>
+where
+    T: Copy,
+    T: Default,
+{
+    /// generates a new FourQuadrantMatrix with a given zero point (the point in the underlying 2d
+    /// array considered to be (0,0))
+    pub fn new(zero_coord: UPoint) -> FourQuadrantMatrix<{ X }, { Y }, T> {
+        FourQuadrantMatrix {
+            matrix: [[T::default(); X]; Y],
+            max_point: UPoint { x: X - 1, y: 0 }.to_point(&zero_coord),
+            min_point: UPoint { x: 0, y: Y - 1 }.to_point(&zero_coord),
+            zero_coord,
+        }
+    }
+
+    pub fn zero_coord(&self) -> UPoint {
+        self.zero_coord
+    }
+
+    pub fn min_point(&self) -> Point {
+        self.min_point
+    }
+
+    pub fn max_point(&self) -> Point {
+        self.max_point
+    }
+
+    /// makes sure a point is in bounds and if not, brings it in bounds.
+    pub fn bound_point(&self, point: &mut Point) {
+        if point.x > self.max_point.x {
+            point.x = self.max_point.x
+        }
+
+        if point.y > self.max_point.y {
+            point.y = self.max_point.y
+        }
+
+        if point.x < self.min_point.x {
+            point.x = self.min_point.x
+        }
+
+        if point.y < self.min_point.y {
+            point.y = self.min_point.y
+        }
+    }
+
+    /// checks if the point is in bounds.
+    pub fn is_in_bounds(&self, point: &Point) -> bool {
+        point.x <= self.max_point.x
+            && point.y <= self.max_point.y
+            && point.x >= self.min_point.x
+            && point.y >= self.min_point.y
+    }
+    /// fills the matrix with the Ts default value.
+    pub fn reset_matrix(&mut self) {
+        self.matrix = [[T::default(); X]; Y];
+    }
+}
+
+impl<T, const X: usize, const Y: usize> std::ops::IndexMut<Point>
+    for FourQuadrantMatrix<{ X }, { Y }, T>
+{
+    fn index_mut(&mut self, index: Point) -> &mut Self::Output {
+        let upoint = index
+            .to_upoint(&self.zero_coord)
+            .expect("would result in negative unsigned coordinate!");
+        &mut self.matrix[upoint.y][upoint.x]
+    }
+}
+
+impl<T, const X: usize, const Y: usize> std::ops::Index<Point>
+    for FourQuadrantMatrix<{ X }, { Y }, T>
+{
+    type Output = T;
+
+    fn index(&self, index: Point) -> &Self::Output {
+        let upoint = index
+            .to_upoint(&self.zero_coord)
+            .expect("would result in negative unsigned coordinate!");
+        &self.matrix[upoint.y][upoint.x]
+    }
+}
+
+impl<T, const X: usize, const Y: usize> From<FourQuadrantMatrix<{ X }, { Y }, T>> for [[T; X]; Y] {
+    fn from(value: FourQuadrantMatrix<{ X }, { Y }, T>) -> Self {
+        value.matrix
+    }
+}

2023/aoc_libs/src/range.rs

@@ -0,0 +1,118 @@
+// #[derive(Debug, PartialEq, Eq, Clone, Copy)]
+// /// range that includes the start, but excludes the end.
+// pub struct Range<T>
+// where
+//     T: PartialOrd + Ord + PartialEq + Copy,
+// {
+//     start: T,
+//     end: T,
+// }
+
+use std::ops::Range;
+
+pub trait RangeIntersection {
+    fn any_overlap(&self, other: &Self) -> bool;
+    fn calc_intersection(&self, other: &Self) -> Option<Self>
+    where
+        Self: std::marker::Sized;
+    fn complete_overlap(&self, other: &Self) -> bool;
+}
+
+impl<T> RangeIntersection for Range<T>
+where
+    T: PartialOrd + Ord + PartialEq + Copy,
+{
+    /// calcs whether self and other overlap at all. symettric.
+    fn any_overlap(&self, other: &Self) -> bool {
+        if self.is_empty() || other.is_empty() {
+            false
+        } else {
+            self.start < other.end && self.end > other.start
+        }
+    }
+
+    /// calculates the range that is part of both ranges.
+    /// Returns None if the ranges do not overlap.
+    fn calc_intersection(&self, other: &Self) -> Option<Self> {
+        if self.any_overlap(other) {
+            Some(self.start.max(other.start)..self.end.min(other.end))
+        } else {
+            None
+        }
+    }
+
+    ///calcs whether self completely contains other
+    fn complete_overlap(&self, other: &Self) -> bool {
+        if self.is_empty() || other.is_empty() {
+            false
+        } else {
+            self.start <= other.start && self.end >= other.end
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn calc_intersection() {
+        let a = 1..5;
+        let b = 3..9;
+        let c = 4..6;
+        let d = 6..8;
+        let e = 1..4;
+        assert_eq!(a.calc_intersection(&b), Some(3..5));
+        assert_eq!(b.calc_intersection(&a), Some(3..5));
+
+        assert_eq!(a.calc_intersection(&d), None);
+        assert_eq!(d.calc_intersection(&a), None);
+
+        assert_eq!(c.calc_intersection(&b), Some(c.clone()));
+        assert_eq!(b.calc_intersection(&c), Some(c.clone()));
+
+        assert_eq!(e.calc_intersection(&b), Some(3..4));
+        assert_eq!(b.calc_intersection(&e), Some(3..4));
+    }
+
+    #[test]
+    fn test_any_overlap() {
+        let a = 1..5;
+        let b = 3..9;
+        let c = 4..6;
+        let d = 6..8;
+        let e = 1..4;
+        assert!(a.any_overlap(&b));
+        assert!(b.any_overlap(&a));
+
+        assert!(b.any_overlap(&c));
+        assert!(c.any_overlap(&b));
+
+        assert!(!d.any_overlap(&a));
+        assert!(!a.any_overlap(&d));
+
+        assert!(e.any_overlap(&b));
+        assert!(b.any_overlap(&e));
+
+        assert!(!e.any_overlap(&d));
+        assert!(!d.any_overlap(&e));
+    }
+    #[test]
+    fn test_complete_overlap() {
+        let a = 1..5;
+        let b = 3..9;
+        let c = 4..6;
+        let d = 6..8;
+        let e = 1..4;
+        assert!(a.complete_overlap(&a));
+
+        assert!(a.complete_overlap(&e));
+        assert!(!e.complete_overlap(&a));
+
+        assert!(b.complete_overlap(&c));
+        assert!(!c.complete_overlap(&b));
+
+        assert!(b.complete_overlap(&d));
+        assert!(!d.complete_overlap(&b));
+    }
+}