day 6

Cargo.lock

@@ -34,6 +34,10 @@ version = "0.1.0"
 name = "day05"
 version = "0.1.0"
 
+[[package]]
+name = "day06"
+version = "0.1.0"
+
 [[package]]
 name = "memchr"
 version = "2.6.4"

Cargo.toml

@@ -7,7 +7,7 @@ members = [
 	"day03",
 	"day04",
 	"day05",
-#	"day06",
+	"day06",
 #	"day07",
 #	"day08",
 #	"day09",

day06/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day06"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day06/input.txt

@@ -0,0 +1,2 @@
+Time:        42     89     91     89
+Distance:   308   1170   1291   1467

day06/src/main.rs

@@ -0,0 +1,80 @@
+use std::fs;
+
+fn main() {
+  const FILE_PATH: &str = "input.txt";
+  println!(
+    "Welcome to AOC2023 day 6, first we will read the file {}",
+    FILE_PATH
+  );
+  let contents = fs::read_to_string(FILE_PATH).expect("Should have been able to read the file");
+
+  println!("And we parse the file!");
+  println!("First thing: {}", calculate_1(&parse1(&contents)));
+  println!("Second thing: {}", calculate(&parse2(&contents)));
+}
+
+fn parse1(input: &str) -> Vec<(u64, u64)> {
+  let mut lines = input.lines().map(|line| {
+    line
+      .split(": ")
+      .nth(1)
+      .unwrap()
+      .trim()
+      .split_ascii_whitespace()
+      .map(|n| n.parse().expect("NAN"))
+  });
+  let time = lines.next().unwrap();
+  let mut distance = lines.next().unwrap();
+  let mut output = Vec::new();
+  time.for_each(|n| output.push((n, distance.next().unwrap())));
+  output
+}
+
+fn parse2(input: &str) -> (u64, u64) {
+  let mut lines = input.lines().map(|line| {
+    line
+      .split(": ")
+      .nth(1)
+      .unwrap()
+      .chars()
+      .filter(|c| !c.is_ascii_whitespace())
+      .collect::<String>()
+  });
+  (
+    lines.next().unwrap().parse().expect("NAN"),
+    lines.next().unwrap().parse().expect("NAN"),
+  )
+}
+
+fn calculate_1(races: &Vec<(u64, u64)>) -> u64 {
+  races
+    .iter()
+    .map(|race| calculate(race))
+    .fold(1, |a, n| a * n)
+}
+
+fn calculate((time, distance): &(u64, u64)) -> u64 {
+  (1..*time)
+    .map(|p| p * (time - p))
+    .filter(|n| n > &distance)
+    .count()
+    .try_into()
+    .unwrap()
+}
+
+#[cfg(test)]
+mod test {
+  const INPUT: &str = r#"Time:      7  15   30
+Distance:  9  40  200"#;
+  use super::*;
+  #[test]
+  fn test1() {
+    let tst = parse1(INPUT);
+    assert_eq!(calculate_1(&tst), 288);
+  }
+  #[test]
+  fn test2() {
+    let tst = parse2(INPUT);
+    assert_eq!(calculate(&tst), 71503);
+  }
+}

template/src/main.rs

@@ -2,18 +2,18 @@ use std::fs;
 
 fn main() {
   const FILE_PATH: &str = "input.txt";
-    println!("Welcome to AOC2023 day NUMBER, first we will read the file {}", FILE_PATH);
+  println!(
-    let contents = fs::read_to_string(FILE_PATH)
+    "Welcome to AOC2023 day NUMBER, first we will read the file {}",
-        .expect("Should have been able to read the file");
+    FILE_PATH
+  );
+  let contents = fs::read_to_string(FILE_PATH).expect("Should have been able to read the file");
 
   println!("And we parse the file!");
   //let mut data = parse(&contents);
   //println!("First thing: {}", calculate_1(&data));
   //println!("Second thing: {}", calculate_2(&data));
-
 }
 
-
 #[cfg(test)]
 mod test {
   const INPUT: &str = r#""#;
@@ -24,7 +24,7 @@ mod test {
       assert_eq!(calculate_1(&tst), 24000);
   } */
   /*   #[test]
-    fn testtemplate2() {
+  fn test2() {
       let tst = parse(INPUT);
       assert_eq!(calculate_2(&tst), 24000);
   } */