Finished day 1

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "AoC2015"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "AoC2015"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/day1.rs

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+use std::fs;
+
+pub fn run() {
+    println!("Day 1:");
+    let input = fs::read_to_string("./inputs/day1.txt")
+        .expect("Could not read file")
+        .to_string();
+
+    // part1(&lines);
+    // part2(&lines);
+
+    println!("\tPart 1: {}", part1(&input));
+    println!("\tPart 2: {}", part2(&input));
+}
+
+fn part1(directions: &String) -> isize {
+    directions
+        .chars()
+        .map(|c| match c {
+            '(' => 1,
+            ')' => -1,
+            _ => 0,
+        })
+        .sum::<isize>()
+}
+fn part2(directions: &String) -> usize {
+    let mut floor: isize = 0;
+
+    for (num, dir) in directions.chars().enumerate() {
+        floor += match dir {
+            '(' => 1,
+            ')' => -1,
+            _ => 0,
+        };
+
+        if floor == -1 {
+            return num + 1;
+        }
+    }
+
+    return directions.len() + 1;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_1() {
+        let mut input = "(())".to_string();
+        assert_eq!(part1(&input), 0);
+
+        input = "()()".to_string();
+        assert_eq!(part1(&input), 0);
+
+        input = "(((".to_string();
+        assert_eq!(part1(&input), 3);
+
+        input = "(()(()(".to_string();
+        assert_eq!(part1(&input), 3);
+
+        input = "())".to_string();
+        assert_eq!(part1(&input), -1);
+
+        input = ")())())".to_string();
+        assert_eq!(part1(&input), -3);
+    }
+
+    #[test]
+    fn test_2() {
+        let mut input = ")".to_string();
+        assert_eq!(part2(&input), 1);
+
+        input = "()())".to_string();
+        assert_eq!(part2(&input), 5);
+    }
+}

src/main.rs

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+mod day1;
+
+fn main() {
+    println!("Running Advent of Code 2021");
+    day1::run();
+}