days 1-3

day01/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 = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "day01"
+version = "0.1.0"
+dependencies = [
+ "regex",
+]
+
+[[package]]
+name = "memchr"
+version = "2.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f665ee40bc4a3c5590afb1e9677db74a508659dfd71e126420da8274909a0167"
+
+[[package]]
+name = "regex"
+version = "1.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "380b951a9c5e80ddfd6136919eef32310721aa4aacd4889a8d39124b026ab343"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f804c7828047e88b2d32e2d7fe5a105da8ee3264f01902f796c8e067dc2483f"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"

day01/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "day01"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+regex = "1.10.2"

day01/src/main.rs

@@ -0,0 +1,45 @@
+use std::io::{stdin, BufRead};
+
+const NUM_TEST: [(&str, &str); 9] = [
+    ("one", "1"),
+    ("two", "2"),
+    ("three", "3"),
+    ("four", "4"),
+    ("five", "5"),
+    ("six", "6"),
+    ("seven", "7"),
+    ("eight", "8"),
+    ("nine", "9"),
+];
+
+fn main() {
+    let input = stdin().lock().lines().map(|l| l.unwrap());
+    let mut part_one_total = 0;
+    let mut part_two_total = 0;
+
+    for line in input {
+        part_one_total += part_one_calc(&line);
+        part_two_total += part_two_calc(&line);
+    }
+
+    println!("P1: {} P2: {}", part_one_total, part_two_total);
+}
+
+fn part_two_calc(line: &str) -> usize {
+    let mut line = String::from(line);
+
+    for str in NUM_TEST {
+        if line.contains(str.0) {
+            let swap = str.0.to_string() + str.1 + str.0;
+            line = line.replace(str.0, &swap);
+        }
+    }
+    part_one_calc(&line)
+}
+
+fn part_one_calc(line: &str) -> usize {
+    let mut nums = line.chars().filter(|c| c.is_numeric());
+    let first = nums.next().unwrap_or('0');
+    let last = nums.last().unwrap_or(first);
+    format!("{}{}", first, last).parse().unwrap()
+}