Added 2022 day 4

aoc2022/Cargo.toml

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+[package]
+name = "aoc2022"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

aoc2022/src/day_4.rs

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+#[derive(Debug)]
+struct Range(i32, i32);
+
+impl Range {
+    fn contains(&self, other: &Range) -> bool {
+        return self.0 <= other.0 && self.1 >= other.1;
+    }
+
+    fn from_str(string: &str) -> Range {
+        let (start, end) = string.split_once('-').unwrap();
+        return Range(start.parse::<i32>().unwrap(), end.parse::<i32>().unwrap());
+    }
+}
+
+fn parse_pairs(line: &str) -> (Range, Range) {
+    let (left, right) = line.split_once(',').unwrap();
+    return (Range::from_str(left), Range::from_str(right));
+}
+
+fn solution_part1(input: &str) -> i32 {
+    let mut result: i32 = 0;
+    for line in input.lines() {
+        let (left, right) = parse_pairs(line);
+        if left.contains(&right) || right.contains(&left) {
+            result += 1;
+        }
+    }
+    return result;
+}
+
+fn solution_part2(input: &str) -> i32 {
+    let mut result: i32 = 0;
+    for line in input.lines() {
+        let (left, right) = parse_pairs(line);
+        if left.0 <= right.1 && left.1 >= right.0 {
+            result += 1;
+        }
+    }
+    return result;
+}
+
+#[cfg(test)]
+mod tests {
+    use std::fs;
+
+    use super::*;
+
+    #[test]
+    fn contains() {
+        assert!(Range(4, 6).contains(&Range(6, 6)))
+    }
+
+    #[test]
+    fn basic_example() {
+        let input = "2-4,6-8\n2-3,4-5\n5-7,7-9\n2-8,3-7\n6-6,4-6\n2-6,4-8";
+        let expected = 2;
+        let result = solution_part1(input);
+        assert_eq!(result, expected);
+    }
+
+    #[test]
+    fn answer_part1() {
+        let input = fs::read_to_string("inputs/day_4.txt").unwrap();
+        println!(
+            "Answer to part 1 of day 4: {:#?}",
+            solution_part1(input.as_str())
+        );
+    }
+
+    #[test]
+    fn answer_part2() {
+        let input = fs::read_to_string("inputs/day_4.txt").unwrap();
+        println!(
+            "Answer to part 2 of day 4: {:#?}",
+            solution_part2(input.as_str())
+        );
+    }
+}

aoc2022/src/lib.rs

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+#[allow(dead_code)]
+mod day_4;