move everything to single crate

aoc2018/src/day01.rs

@@ -0,0 +1,147 @@
+use std::collections::HashSet;
+
+use super::Result;
+
+const INPUT: &str = include_str!("../input/day01.txt");
+
+pub fn run() -> Result<()> {
+    println!("part 1: {}", part1(INPUT)?);
+    println!("part 2: {}", part2(INPUT)?);
+
+    Ok(())
+}
+
+fn part1(input: &str) -> Result<i32> {
+    let freq = input
+        .lines()
+        .map(|line| line.parse::<i32>().unwrap())
+        .sum::<i32>();
+    Ok(freq)
+}
+
+fn part2(input: &str) -> Result<i32> {
+    let mut freqs = HashSet::new();
+    let mut freq = 0;
+    loop {
+        for line in input.lines() {
+            if freqs.contains(&freq) {
+                return Ok(freq);
+            } else {
+                freqs.insert(freq);
+            }
+            freq += line.parse::<i32>()?;
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn part1_provided1() {
+        let input = "+1
+-2
++3
++1
+";
+
+        assert_eq!(part1(input).unwrap(), 3);
+    }
+
+    #[test]
+    fn part1_provided2() {
+        let input = "+1
++1
++1
+";
+
+        assert_eq!(part1(input).unwrap(), 3);
+    }
+
+    #[test]
+    fn part1_provided3() {
+        let input = "+1
++1
+-2
+";
+
+        assert_eq!(part1(input).unwrap(), 0);
+    }
+
+    #[test]
+    fn part1_provided4() {
+        let input = "-1
+-2
+-3
+";
+
+        assert_eq!(part1(input).unwrap(), -6);
+    }
+
+    #[test]
+    fn part1_real() {
+        assert_eq!(part1(INPUT).unwrap(), 427);
+    }
+
+    #[test]
+    fn part2_provided1() {
+        let input = "+1
+-2
++3
++1
+";
+
+        assert_eq!(part2(input).unwrap(), 2);
+    }
+
+    #[test]
+    fn part2_provided2() {
+        let input = "+1
+-1
+";
+
+        assert_eq!(part2(input).unwrap(), 0);
+    }
+
+    #[test]
+    fn part2_provided3() {
+        let input = "+3
++3
++4
+-2
+-4
+";
+
+        assert_eq!(part2(input).unwrap(), 10);
+    }
+
+    #[test]
+    fn part2_provided4() {
+        let input = "-6
++3
++8
++5
+-6
+";
+
+        assert_eq!(part2(input).unwrap(), 5);
+    }
+
+    #[test]
+    fn part2_provided5() {
+        let input = "+7
++7
+-2
+-7
+-4
+";
+
+        assert_eq!(part2(input).unwrap(), 14);
+    }
+
+    #[test]
+    fn part2_real() {
+        assert_eq!(part2(INPUT).unwrap(), 341);
+    }
+}