From 7ac8ef843d063fdfe3be0f0f31f36df53f26437e Mon Sep 17 00:00:00 2001
From: Fabian Schmidt <fabschmidt96@gmail.com>
Date: Mon, 16 Sep 2024 12:42:55 +0200
Subject: [PATCH] Solution 8

---
 src/bin/problem_8.rs | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 src/bin/problem_8.rs

diff --git a/src/bin/problem_8.rs b/src/bin/problem_8.rs
new file mode 100644
index 0000000..e1eb5e3
--- /dev/null
+++ b/src/bin/problem_8.rs
@@ -0,0 +1,34 @@
+const NUMBER: &str =  "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450";
+
+fn main() {
+    let result = adjacent_product(NUMBER, 13);
+    println!("Result: {}", result);
+}
+
+fn adjacent_product(number: &str, window: usize) -> i64 {
+    let result: i64 = number
+        .chars()
+        .collect::<Vec<char>>()
+        .windows(window)
+        .map(|adjacent_digits| {
+            adjacent_digits
+                .iter()
+                .map(|digit| digit.to_digit(10).unwrap() as i64)
+                .product()
+        })
+        .max()
+        .unwrap();
+
+    return result;
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{adjacent_product, NUMBER};
+
+    #[test]
+    fn it_works() {
+        let result = adjacent_product(NUMBER, 4);
+        assert_eq!(result, 5832);
+    }
+}