porting over AOC from previous years to a monorepo.

2023/days/09/src/part1.rs

@@ -0,0 +1,20 @@
+use crate::parse::*;
+
+pub fn part1(input: &[Vec<i32>]) -> i32 {
+    input.iter().map(|l| extrapolate_sequence(l)).sum()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() {
+        let input = vec![
+            vec![0, 3, 6, 9, 12, 15],
+            vec![1, 3, 6, 10, 15, 21],
+            vec![10, 13, 16, 21, 30, 45],
+        ];
+        assert_eq!(part1(&input), 114);
+    }
+}