solution: day 3

src/days.rs

@@ -1,6 +1,6 @@
 pub mod d1;
 pub mod d2;
-// pub mod d3;
+pub mod d3;
 // pub mod d4;
 // pub mod d5;
 // pub mod d6;

src/days/d3.rs

@@ -0,0 +1,48 @@
+use crate::prelude::*;
+
+pub type I = &'static str;
+pub type O = usize;
+
+fn _silver (data: &I) -> O {
+    data.lines().filter(|line| {
+        let v = line.trim().split_ascii_whitespace().filter(|part| !part.is_empty()).map(|num| num.trim().parse::<u16>().unwrap()).collect_vec();
+
+        v[0] + v[1] > v[2] &&
+        v[1] + v[2] > v[0] &&
+        v[0] + v[2] > v[1]
+    }).count()
+}
+
+fn _gold (data: &I) -> O {
+    let mut counter = 0;
+    for chunk in &data.lines().chunks(3) {
+        let v = chunk.map(|line| line.trim().split_ascii_whitespace().filter(|part| !part.is_empty()).map(|num| num.trim().parse::<u16>().unwrap()).collect_vec()).collect_vec();
+        counter += (0usize..3).into_iter().filter(|&i| v[0][i] + v[1][i] > v[2][i] && v[1][i] + v[2][i] > v[0][i] && v[2][i] + v[0][i] > v[1][i]).count();
+    }
+    counter
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    fn read () -> I {
+        inc!(3)
+    }
+
+    #[test]
+    fn silver () {
+        let data = read();
+        let ans = _silver(&data);
+
+        assert_eq!(ans, 993)
+    }
+
+    #[test]
+    fn gold () {
+        let data = read();
+        let ans = _gold(&data);
+
+        assert_eq!(ans, 1849)
+    }
+}