y2016d3

y2016/src/bin/d3.rs

@@ -0,0 +1,20 @@
+use std::fs;
+
+use y2016::days::d3;
+
+fn main() {
+    part1();
+    part2();
+}
+
+fn part1() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/3_input.txt")).unwrap();
+    println!("{}", d3::process_part1(&content));
+}
+
+fn part2() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/3_input.txt")).unwrap();
+    println!("{}", d3::process_part2(&content));
+}

y2016/src/days/d3.rs

@@ -0,0 +1,60 @@
+pub fn process_part1(input: &str) -> i32 {
+    input
+        .lines()
+        .map(|line| {
+            let sides = line
+                .split_whitespace()
+                .map(|side| side.parse::<u32>().unwrap())
+                .collect::<Vec<u32>>();
+            if sides[0] + sides[1] > sides[2]
+                && sides[0] + sides[2] > sides[1]
+                && sides[1] + sides[2] > sides[0]
+            {
+                return 1;
+            }
+            0
+        })
+        .sum()
+}
+
+pub fn process_part2(input: &str) -> u32 {
+    input
+        .lines()
+        .map(|line| {
+            line.split_whitespace()
+                .map(|side| side.parse::<u32>().unwrap())
+                .collect::<Vec<u32>>()
+        })
+        .collect::<Vec<Vec<u32>>>()
+        .chunks(3)
+        .map(|line_triple| {
+            (0..3)
+                .map(|triangle_idx| {
+                    if line_triple[0][triangle_idx] + line_triple[1][triangle_idx]
+                        > line_triple[2][triangle_idx]
+                        && line_triple[0][triangle_idx] + line_triple[2][triangle_idx]
+                            > line_triple[1][triangle_idx]
+                        && line_triple[1][triangle_idx] + line_triple[2][triangle_idx]
+                            > line_triple[0][triangle_idx]
+                    {
+                        return 1;
+                    }
+                    0
+                })
+                .sum::<u32>()
+        })
+        .sum()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const INPUT: &str = " 5 10 25";
+
+    #[test]
+    fn part1() {
+        let result = process_part1(INPUT);
+        assert_eq!(result, 0);
+    }
+}

y2016/src/days/mod.rs

@@ -1,3 +1,5 @@
 pub mod d1;
 
 pub mod d2;
+
+pub mod d3;