feat: day 14 (1)

Cargo.toml

@@ -18,6 +18,7 @@ full = [
     "day11",
     "day12",
     "day13",
+    "day14",
 ]
 default = ["full"]
 day1 = []
@@ -33,6 +34,7 @@ day10 = []
 day11 = []
 day12 = []
 day13 = []
+day14 = []
 
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

inputs/day14/example.txt

@@ -0,0 +1,12 @@
+p=0,4 v=3,-3
+p=6,3 v=-1,-3
+p=10,3 v=-1,2
+p=2,0 v=2,-1
+p=0,0 v=1,3
+p=3,0 v=-2,-2
+p=7,6 v=-1,-3
+p=3,0 v=-1,-2
+p=9,3 v=2,3
+p=7,3 v=-1,2
+p=2,4 v=2,-3
+p=9,5 v=-3,-3

src/day14.rs

@@ -0,0 +1,78 @@
+#![allow(
+    clippy::cast_sign_loss,
+    clippy::cast_possible_wrap,
+    clippy::too_many_lines
+)]
+
+use std::str::FromStr;
+
+use color_eyre::eyre::{self, OptionExt};
+
+struct Robot {
+    x: isize,
+    y: isize,
+    vx: isize,
+    vy: isize,
+}
+
+impl Robot {
+    fn move_robot(&mut self, dims: (isize, isize)) {
+        self.x += self.vx;
+        self.y += self.vy;
+        if self.x >= dims.0 {
+            self.x -= dims.0;
+        }
+        if self.y >= dims.1 {
+            self.y -= dims.1;
+        }
+        if self.x < 0 {
+            self.x += dims.0;
+        }
+        if self.y < 0 {
+            self.y += dims.1;
+        }
+    }
+}
+impl FromStr for Robot {
+    type Err = eyre::Error;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let (pos, vel) = s.split_once(' ').ok_or_eyre("line malformed")?;
+        let position = pos.split_once(',').ok_or_eyre("line malformed")?;
+        let velocity = vel.split_once(',').ok_or_eyre("line malformed")?;
+        Ok(Robot {
+            x: position
+                .0
+                .split_once('=')
+                .ok_or_eyre("malformed position")?
+                .1
+                .parse()?,
+            y: position.1.parse()?,
+            vx: velocity
+                .0
+                .split_once('=')
+                .ok_or_eyre("malformed velocity")?
+                .1
+                .parse()?,
+            vy: velocity.1.parse()?,
+        })
+    }
+}
+
+pub fn pt1(input: &str) -> usize {
+    let dims: (isize, isize) = (101, 103);
+    let mut robots = input.lines().flat_map(Robot::from_str).collect::<Vec<_>>();
+    for _ in 0..100 {
+        for robot in &mut robots {
+            robot.move_robot(dims);
+        }
+    }
+    robots.iter().filter(|r| r.x < 50 && r.y < 51).count()
+        * robots.iter().filter(|r| r.x > 50 && r.y < 51).count()
+        * robots.iter().filter(|r| r.x < 50 && r.y > 51).count()
+        * robots.iter().filter(|r| r.x > 50 && r.y > 51).count()
+}
+
+pub fn pt2(_input: &str) -> String {
+    "lol no".into()
+}

src/main.rs

@@ -29,6 +29,8 @@ mod day11;
 mod day12;
 #[cfg(feature = "day13")]
 mod day13;
+#[cfg(feature = "day14")]
+mod day14;
 
 fn main() -> eyre::Result<()> {
     color_eyre::install()?;
@@ -61,6 +63,8 @@ fn main() -> eyre::Result<()> {
     solve_day(12, day12::pt1, day12::pt2);
     #[cfg(feature = "day13")]
     solve_day(13, day13::pt1, day13::pt2);
+    #[cfg(feature = "day14")]
+    solve_day(14, day14::pt1, day14::pt2);
     Ok(())
 }