Day3

day3/rust/Cargo.lock

@@ -0,0 +1,54 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aho-corasick"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "memchr"
+version = "2.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
+
+[[package]]
+name = "regex"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b544ef1b4eac5dc2db33ea63606ae9ffcfac26c1416a2806ae0bf5f56b201191"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "809e8dc61f6de73b46c85f4c96486310fe304c434cfa43669d7b40f711150908"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b15c43186be67a4fd63bee50d0303afffcef381492ebe2c5d87f324e1b8815c"
+
+[[package]]
+name = "rust"
+version = "0.1.0"
+dependencies = [
+ "regex",
+]

day3/rust/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+regex = "1.11.1"

day3/rust/src/main.rs

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+use std::io::Read;
+
+use regex::Regex;
+
+fn main() {
+    let mut stdin = std::io::stdin();
+
+    let mut input = String::new();
+    stdin.read_to_string(&mut input).unwrap();
+
+    let regex = Regex::new(r"mul\((\d{1,3}),(\d{1,3})\)|do\(\)|don't\(\)").unwrap();
+
+    let mut enabled = true;
+
+    let mut sum = 0;
+    let mut sum2 = 0;
+    for capture in regex.captures_iter(&input) {
+        let matched = capture.get(0).unwrap().as_str();
+        match matched {
+            "do()" => {
+                enabled = true;
+                continue;
+            }
+            "don't()" => {
+                enabled = false;
+                continue;
+            }
+            _ => (),
+        }
+
+        let (a, b): (isize, isize) = (
+            capture.get(1).unwrap().as_str().parse().unwrap(),
+            capture.get(2).unwrap().as_str().parse().unwrap(),
+        );
+
+        sum += a * b;
+
+        if enabled {
+            sum2 += a * b;
+        }
+    }
+
+    println!("{}", sum);
+    println!("{}", sum2);
+}