feat: part 1 of day 2

ankjevel · ankjevel · commit 378ea87e3671 · 2020-12-05T14:28:55.000+01:00
diff --git a/README.md b/README.md
@@ -4,7 +4,7 @@
 ## Progress:
 
 - [Day 1](https://github.com/ankjevel/adventofcode/tree/2020/day_01) 🌟 🌟
-- [Day 2](#)
+- [Day 2](https://github.com/ankjevel/adventofcode/tree/2020/day_02) 🌟
 - [Day 3](#)
 - [Day 4](#)
 - [Day 5](#)
diff --git a/day_02/Cargo.toml b/day_02/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "day_02"
+version = "0.1.0"
+authors = ["Dennis Pettersson <mail@dennispettersson.se>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/day_02/src/lib.rs b/day_02/src/lib.rs
@@ -0,0 +1,45 @@
+pub mod part_01;
+pub mod part_02;
+
+pub type Line = (u16, u16, char, String);
+
+pub fn parse_input(input: &str) -> Vec<Line> {
+    input
+        .lines()
+        .map(str::trim)
+        .filter(|string| !string.is_empty())
+        .map(|part| {
+            let mut iter = part.split(" ").map(str::trim);
+            let mut range = iter.next().unwrap().split("-");
+
+            let min = range.next().unwrap().parse::<u16>().unwrap();
+            let max = range.next().unwrap().parse::<u16>().unwrap();
+
+            let character = iter.next().unwrap().to_string().chars().next().unwrap();
+            let password = iter.next().unwrap().trim().to_owned();
+
+            (min, max, character, password)
+        })
+        .collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const EXAMPLE_DATA: &'static str = "
+        2-6 c: fcpwjqhcgtffzlbj
+        6-9 x: xxxtwlxxx
+    ";
+
+    #[test]
+    fn it_can_parse_input_as_expected() {
+        assert_eq!(
+            parse_input(&EXAMPLE_DATA),
+            vec![
+                (2, 6, 'c', "fcpwjqhcgtffzlbj".to_string()),
+                (6, 9, 'x', "xxxtwlxxx".to_string())
+            ]
+        );
+    }
+}
diff --git a/day_02/src/main.rs b/day_02/src/main.rs
@@ -0,0 +1,14 @@
+use std::io::Result;
+
+use day_02::{parse_input, part_01::main as part_01};
+
+fn main() -> Result<()> {
+    let input = parse_input(include_str!("../../input/day_02"));
+
+    println!("part_01: {:?}", part_01(&input).unwrap());
+
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {}
diff --git a/day_02/src/part_01.rs b/day_02/src/part_01.rs
@@ -0,0 +1,35 @@
+use crate::Line;
+use std::io::Result;
+
+pub fn main(input: &Vec<Line>) -> Result<u16> {
+    let mut count = 0;
+    for (min, max, char_to_match, password_string) in input {
+        let matches = password_string
+            .chars()
+            .into_iter()
+            .filter(|c| c == char_to_match)
+            .count() as u16;
+
+        if &matches >= min && &matches <= max {
+            count += 1;
+        }
+    }
+    Ok(count)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::parse_input;
+
+    const EXAMPLE_DATA: &'static str = "
+        1-3 a: abcde
+        1-3 b: cdefg
+        2-9 c: ccccccccc
+    ";
+
+    #[test]
+    fn it_gets_the_example_correct() {
+        assert_eq!(main(&parse_input(EXAMPLE_DATA)).unwrap(), 2)
+    }
+}
diff --git a/day_02/src/part_02.rs b/day_02/src/part_02.rs
@@ -0,0 +1,8 @@
+use std::io::Result;
+
+pub fn main() -> Result<()> {
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {}
diff --git a/input/day_02 b/input/day_02
