Add day 1 for 2022

1 files changed, 72 insertions, 0 deletions

diff --git a/2022/day1/src/lib.rs b/2022/day1/src/lib.rs
new file mode 100644
index 0000000..26df697
--- /dev/null
+++ b/2022/day1/src/lib.rs
@@ -0,0 +1,72 @@
+pub fn get_sums(input: &str) -> Vec<i32> {
+    let groups: Vec<&str> = input.split("\n\n").collect::<Vec<&str>>();
+    let data_groups = groups
+        .into_iter()
+        .map(|x| {
+            let numbers: i32 = x
+                .split('\n')
+                .map(|x| x.parse::<i32>().unwrap_or_default())
+                .sum();
+
+            return numbers;
+        })
+        .collect::<Vec<i32>>();
+
+    data_groups
+}
+
+pub fn part1(input: &str) -> i32 {
+    let sums = get_sums(input);
+
+    sums.into_iter().max().unwrap()
+}
+
+pub fn part2(input: &str) -> i32 {
+    let mut sums = get_sums(input);
+
+    sums.sort();
+    sums.reverse();
+
+    sums[0] + sums[1] + sums[2]
+}
+
+#[cfg(test)]
+mod day1_tests {
+    use super::*;
+
+    #[test]
+    fn test_example() {
+        let data = include_str!("../example.txt");
+
+        let result = part1(data);
+
+        assert_eq!(result, 24000);
+    }
+
+    #[test]
+    fn test_input() {
+        let data = include_str!("../input.txt");
+
+        let result = part1(data);
+
+        assert_eq!(result, 69912);
+    }
+
+    #[test]
+    fn test_example_part2() {
+        let data = include_str!("../example.txt");
+
+        let result = part2(data);
+
+        assert_eq!(result, 45000);
+    }
+
+    #[test]
+    fn test_input_part2() {
+        let data = include_str!("../input.txt");
+
+        let result = part2(data);
+
+        assert_eq!(result, 208180);
+    }
+}