1 files changed, 36 insertions, 0 deletions
diff --git a/src/bin/2021/day1.rs b/src/bin/2021/day1.rs
new file mode 100644
index 0000000..fce763c
--- /dev/null
+++ b/src/bin/2021/day1.rs
@@ -0,0 +1,36 @@
+use advent_of_code::prelude::*;
+
+pub fn parse(fh: File) -> Result<Vec<i64>> {
+    Ok(parse::lines(fh).collect())
+}
+
+pub fn part1(ints: Vec<i64>) -> Result<usize> {
+    Ok(ints
+        .windows(2)
+        .map(|a| a[1] - a[0])
+        .filter(|x| *x > 0)
+        .count())
+}
+
+pub fn part2(ints: Vec<i64>) -> Result<usize> {
+    Ok(ints
+        .windows(3)
+        .map(|a| a[0] + a[1] + a[2])
+        .collect::<Vec<_>>()
+        .windows(2)
+        .map(|a| a[1] - a[0])
+        .filter(|x| *x > 0)
+        .count())
+}
+
+#[test]
+fn test() {
+    assert_eq!(
+        part1(parse(parse::data(2021, 1).unwrap()).unwrap()).unwrap(),
+        1602
+    );
+    assert_eq!(
+        part2(parse(parse::data(2021, 1).unwrap()).unwrap()).unwrap(),
+        1633
+    );
+}