init: day 1&2

one/.gitignore

@@ -0,0 +1 @@
+/target

one/Cargo.lock

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+# 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 = "memchr"
+version = "2.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f665ee40bc4a3c5590afb1e9677db74a508659dfd71e126420da8274909a0167"
+
+[[package]]
+name = "one"
+version = "0.1.0"
+dependencies = [
+ "regex",
+]
+
+[[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"

one/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "one"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+regex = "1.10.2"
+
+[features]
+default = ["part_two"]
+part_two = []

one/src/main.rs

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+use std::{
+    fs::File,
+    io::{BufRead, BufReader},
+};
+
+use regex::Regex;
+
+fn main() {
+    let input_file = File::open("input.txt").unwrap();
+    let reader = BufReader::new(input_file);
+    let regexp = Regex::new(r"[a-zA-z]").unwrap();
+
+    let mut sum = 0;
+    for line in reader.lines() {
+        if let Ok(line) = line {
+            let nums = regexp.replace_all(&line, "").to_string();
+            let str = nums.chars().nth(0).unwrap().to_string()
+                + nums.chars().last().unwrap().to_string().as_str();
+            sum += str.parse::<i32>().unwrap();
+        }
+    }
+
+    println!("{}", sum);
+}