Day 17 part 1

2021/input/2021/day17.txt

@@ -0,0 +1 @@
+target area: x=88..125, y=-157..-103

2021/src/day17.rs

@@ -0,0 +1,76 @@
+use advent::prelude::*;
+use aoc_runner_derive::{aoc, aoc_generator};
+
+#[derive(Debug)]
+struct Target {
+    x_min: isize,
+    x_max: isize,
+    y_min: isize,
+    y_max: isize,
+}
+
+impl FromStr for Target {
+    type Err = Infallible;
+
+    fn from_str(input: &str) -> std::result::Result<Target, Infallible> {
+        let parts: Vec<_> = input.split(' ').collect();
+        let x = &parts[2][2..].strip_suffix(',').unwrap();
+        let y = &parts[3][2..];
+        let (x_min, x_max) = x
+            .split_once("..")
+            .and_then(|(min, max)| Some((min.parse().unwrap(), max.parse().unwrap())))
+            .unwrap();
+        let (y_min, y_max) = y
+            .split_once("..")
+            .and_then(|(min, max)| Some((min.parse().unwrap(), max.parse().unwrap())))
+            .unwrap();
+
+        Ok(Target {
+            x_min,
+            x_max,
+            y_min,
+            y_max,
+        })
+    }
+}
+
+#[aoc(day17, part1)]
+fn part1(input: &str) -> Result<usize> {
+    let tgt: Target = input.parse()?;
+    dbg!(&tgt);
+    Ok((0..(tgt.y_min).abs() as usize).sum())
+}
+
+/*
+#[aoc(day17, part2)]
+fn part2(input: &str) -> Result<usize> {
+    todo!("part2");
+    Ok(0)
+}
+*/
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() -> Result<()> {
+        let input = r#"
+target area: x=20..30, y=-10..-5
+"#
+        .trim();
+        assert_eq!(part1(input)?, 45);
+        Ok(())
+    }
+
+    /*
+    #[test]
+    fn test_part2()->Result<()> {
+        let input = r#"
+    "#
+        .trim();
+        assert_eq!(part2(input)?, usize::MAX);
+    Ok(())
+    }
+    */
+}

2021/src/lib.rs

@@ -6,6 +6,7 @@ pub mod day13;
 //pub mod day14;
 pub mod day15;
 pub mod day16;
+pub mod day17;
 pub mod day2;
 pub mod day3;
 pub mod day4;