From 0f5138df9215e0cce471d1652698a89300b84e55 Mon Sep 17 00:00:00 2001
From: Max Hohlfeld <maxhohlfeld@it-factum.de>
Date: Thu, 21 Dec 2023 10:58:35 +0100
Subject: [PATCH] feat: 2023 day six

---
 src/aoc2023/day06/input.txt |  2 ++
 src/aoc2023/day06/mod.rs    | 66 +++++++++++++++++++++++++++++++++++++
 src/aoc2023/mod.rs          |  1 +
 src/main.rs                 |  1 +
 4 files changed, 70 insertions(+)
 create mode 100644 src/aoc2023/day06/input.txt
 create mode 100644 src/aoc2023/day06/mod.rs

diff --git a/src/aoc2023/day06/input.txt b/src/aoc2023/day06/input.txt
new file mode 100644
index 0000000..9de08c1
--- /dev/null
+++ b/src/aoc2023/day06/input.txt
@@ -0,0 +1,2 @@
+Time:        46     82     84     79
+Distance:   347   1522   1406   1471
diff --git a/src/aoc2023/day06/mod.rs b/src/aoc2023/day06/mod.rs
new file mode 100644
index 0000000..3d86d2f
--- /dev/null
+++ b/src/aoc2023/day06/mod.rs
@@ -0,0 +1,66 @@
+pub fn task_one(input: &str) -> String {
+    let races = parse_input_for_task_one(input);
+    let mut product = 1_u64;
+
+    for race in races {
+        let uprounded_record_speed = (race.record_distance / race.record_time).ceil();
+
+        let mut count = 0;
+
+        for x in 0..(race.record_time as u32) {
+            if x > uprounded_record_speed as u32 && (race.record_time - x as f64) * x as f64 > race.record_distance {
+                count += 1;
+            }
+        }
+
+        product *= count
+    }
+
+    product.to_string()
+}
+
+pub fn task_two(input: &str) -> String {
+    let race = parse_input_for_task_two(input);
+
+    let uprounded_record_speed = (race.record_distance / race.record_time).ceil();
+
+    let mut count = 0;
+
+    for x in 0..(race.record_time as u32) {
+        if x > uprounded_record_speed as u32 && (race.record_time - x as f64) * x as f64 > race.record_distance {
+            count += 1;
+        }
+    }
+
+    count.to_string()
+}
+
+struct Race {
+    record_time: f64,
+    record_distance: f64
+}
+
+fn parse_input_for_task_one(input: &str) -> Vec<Race> {
+    let mut races = Vec::new();
+    
+    let mut iterator = input.lines();
+    let (_, times) = iterator.next().unwrap().split_once(':').unwrap();
+    let (_, distances) = iterator.next().unwrap().split_once(':').unwrap();
+
+    for pair in times.split_whitespace().zip(distances.split_whitespace()) {
+        races.push(Race { record_time: pair.0.parse().unwrap(), record_distance: pair.1.parse().unwrap() });
+    }
+
+    races
+}
+
+fn parse_input_for_task_two(input: &str) -> Race {
+    let mut iterator = input.lines();
+    let (_, times) = iterator.next().unwrap().split_once(':').unwrap();
+    let (_, distances) = iterator.next().unwrap().split_once(':').unwrap();
+
+    let record_time = times.split_whitespace().collect::<Vec<&str>>().join("").parse().unwrap();
+    let record_distance = distances.split_whitespace().collect::<Vec<&str>>().join("").parse().unwrap();
+
+    Race { record_time, record_distance }
+}
diff --git a/src/aoc2023/mod.rs b/src/aoc2023/mod.rs
index e051fbd..a671a0c 100644
--- a/src/aoc2023/mod.rs
+++ b/src/aoc2023/mod.rs
@@ -2,3 +2,4 @@ pub mod day01;
 pub mod day02;
 pub mod day03;
 pub mod day04;
+pub mod day06;
diff --git a/src/main.rs b/src/main.rs
index 53cf338..454815e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -49,6 +49,7 @@ fn main() {
     puzzles.push(Puzzle { day: 2, year: 2023, task_one: aoc2023::day02::task_one, task_two: aoc2023::day02::task_two });
     puzzles.push(Puzzle { day: 3, year: 2023, task_one: aoc2023::day03::task_one, task_two: aoc2023::day03::task_two });
     puzzles.push(Puzzle { day: 4, year: 2023, task_one: aoc2023::day04::task_one, task_two: aoc2023::day04::task_two });
+    puzzles.push(Puzzle { day: 6, year: 2023, task_one: aoc2023::day06::task_one, task_two: aoc2023::day06::task_two });
 
     puzzles.iter().for_each(|puzzle| puzzle.solve_and_print());
 }