day5 part 1

src/day5/mod.rs

@@ -0,0 +1 @@
+pub mod part1;

src/day5/part1.rs

@@ -0,0 +1,34 @@
+use std::fs;
+
+#[allow(dead_code)]
+pub fn solve() {
+    let file = fs::read_to_string("src/day5/input.txt").expect("You didn't provide input.txt.");
+
+    let mut reading_ranges = true;
+    let mut fresh_products = vec![];
+    let mut ranges = vec![];
+    for line in file.lines() {
+        if line.is_empty() {
+            reading_ranges = false;
+            continue;
+        }
+
+        if reading_ranges {
+            let mut parts = line.split("-");
+            let start = parts.next().unwrap().parse::<usize>().unwrap();
+            let end = parts.next().unwrap().parse::<usize>().unwrap();
+            let range = start..=end;
+            ranges.push(range);
+        } else {
+            let value = line.parse::<usize>().unwrap();
+            for range in &ranges {
+                if range.contains(&value) {
+                    fresh_products.push(value);
+                    break;
+                }
+            }
+        }
+    }
+
+    println!("Fresh products: {:?}", fresh_products.len());
+}

src/day5/sample_input.txt

@@ -0,0 +1,11 @@
+3-5
+10-14
+16-20
+12-18
+
+1
+5
+8
+11
+17
+32

src/main.rs

@@ -2,7 +2,8 @@ mod day1;
 mod day2;
 mod day3;
 mod day4;
+mod day5;
 
 fn main() {
-    day4::part2::solve();
+    day5::solve();
 }