1 files changed, 39 insertions, 0 deletions
diff --git a/2021/src/day01.rs b/2021/src/day01.rs
new file mode 100644
index 0000000..7b1e6a9
--- /dev/null
+++ b/2021/src/day01.rs
@@ -0,0 +1,39 @@
+use std::error::Error;
+use std::fs;
+use std::path::Path;
+
+fn get_input(path: &Path) -> Result<Vec<u16>, Box<dyn Error>> {
+    let data = fs::read_to_string(path)?;
+    Ok(data.lines().filter_map(|x| x.parse::<u16>().ok()).collect())
+}
+
+#[cfg(part1)]
+pub fn solve(path: &Path) -> Result<(), Box<dyn Error>> {
+    let values = get_input(path)?;
+    let mut last = u16::MAX;
+    let mut larger = 0;
+    for v in values {
+        if v > last {
+            larger += 1;
+        }
+
+        last = v;
+    }
+
+    println!("{}", larger);
+    Ok(())
+}
+
+#[cfg(part2)]
+pub fn solve(path: &Path) -> Result<(), Box<dyn Error>> {
+    let values = get_input(path)?;
+    let mut increase = 0;
+    for i in 0..(values.len() - 3) {
+        if values[i] < values[i + 3] {
+            increase += 1;
+        }
+    }
+
+    println!("{}", increase);
+    Ok(())
+}