Day 5 complete

Cargo.lock

@@ -6,9 +6,25 @@ version = 3
 name = "AoC2015"
 version = "0.1.0"
 dependencies = [
+ "itertools",
  "md5",
 ]
 
+[[package]]
+name = "either"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90e5c1c8368803113bf0c9584fc495a58b86dc8a29edbf8fe877d21d9507e797"
+
+[[package]]
+name = "itertools"
+version = "0.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0fd2260e829bddf4cb6ea802289de2f86d6a7a690192fbe91b3f46e0f2c8473"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "md5"
 version = "0.7.0"

Cargo.toml

@@ -6,4 +6,5 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-md5 = "0.7.0"
+md5 = "0.7.0"
+itertools = "0.10.5"

src/day5.rs

@@ -0,0 +1,144 @@
+use std::fs;
+
+use itertools::Itertools;
+
+pub fn run() {
+    println!("Day 5:");
+    let input = fs::read_to_string("./inputs/day5.txt")
+        .expect("Could not read file")
+        .to_string();
+    // dbg!(input.)
+
+    println!("\tPart 1: {}", part1(&input));
+    println!("\tPart 2: {}", part2(&input));
+}
+
+fn part1(input: &String) -> usize {
+    let mut nice = 0;
+
+    for txt in input.split_whitespace() {
+        let mut blacklist_count = 0;
+        let blacklist = ["ab", "cd", "pq", "xy"];
+        for black in blacklist {
+            if txt.contains(black) {
+                blacklist_count += 1;
+            }
+        }
+        if blacklist_count != 0 {
+            continue;
+        }
+
+        let mut repeat_count = 0;
+        for (l, r) in txt.chars().tuple_windows() {
+            if l == r {
+                repeat_count += 1;
+            }
+        }
+        if repeat_count == 0 {
+            continue;
+        }
+
+        let vowels = "aeiou";
+        let mut vowel_count = 0;
+        for c in txt.chars() {
+            if vowels.contains(c) {
+                vowel_count += 1;
+            }
+        }
+
+        if vowel_count < 3 {
+            continue;
+        }
+
+        nice += 1;
+    }
+
+    return nice;
+}
+
+fn part2(input: &String) -> usize {
+    let mut nice = 0;
+
+    for txt in input.split_whitespace() {
+        let mut double = false;
+        for (l, r) in txt
+            .chars()
+            .tuple_windows::<(_, _)>()
+            .enumerate()
+            .tuple_combinations()
+        {
+            if l.1 == r.1 {
+                if l.0.abs_diff(r.0) > 1 {
+                    double = true;
+                }
+            }
+        }
+        if !double {
+            continue;
+        }
+
+        let mut double_split = false;
+        for (l, _, r) in txt.chars().tuple_windows::<(_, _, _)>() {
+            if l == r {
+                double_split = true;
+            }
+        }
+        if double_split {
+            nice += 1;
+        }
+    }
+
+    return nice;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_1_examples() {
+        assert_eq!(part1(&"ugknbfddgicrmopn".to_string()), 1);
+        assert_eq!(
+            part1(
+                &"ugknbfddgicrmopn\naaa\njchzalrnumimnmhp\nhaegwjzuvuyypxyu\ndvszwmarrgswjxmb"
+                    .to_string()
+            ),
+            2
+        );
+    }
+
+    #[test]
+    fn test_1_input() {
+        assert_eq!(
+            part1(
+                &fs::read_to_string("./inputs/day5.txt")
+                    .expect("Could not read file")
+                    .to_string()
+            ),
+            238
+        );
+    }
+
+    #[test]
+    fn test_2_examples() {
+        assert_eq!(part2(&"qjhvhtzxzqqjkmpb".to_string()), 1);
+        assert_eq!(part2(&"xxyxx".to_string()), 1);
+        assert_eq!(part2(&"aaa".to_string()), 0);
+        assert_eq!(part2(&"aaaaa".to_string()), 1);
+        assert_eq!(
+            part2(&"qjhvhtzxzqqjkmpb\nxxyxx\nuurcxstgmygtbstg\nieodomkazucvgmuy".to_string()),
+            2
+        );
+    }
+    #[test]
+    fn test_2_input() {
+        assert_eq!(
+            part2(
+                &fs::read_to_string("./inputs/day5.txt")
+                    .expect("Could not read file")
+                    .to_string()
+            ),
+            69
+        );
+    }
+}

src/main.rs

@@ -2,6 +2,7 @@ mod day1;
 mod day2;
 mod day3;
 mod day4;
+mod day5;
 
 fn main() {
     println!("Running Advent of Code 2021");
@@ -9,4 +10,5 @@ fn main() {
     day2::run();
     day3::run();
     day4::run();
+    day5::run();
 }