2018: aoc02 part1

2018/aoc02/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "aoc02"
+version = "0.1.0"
+authors = ["Antoine Martin <antoine97.martin@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

2018/aoc02/input/input.txt

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2018/aoc02/src/main.rs

@@ -0,0 +1,44 @@
+use std::collections::HashMap;
+use std::env;
+use std::fs;
+
+type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
+
+fn main() -> Result<()> {
+    let mut args = env::args();
+    args.next();
+
+    let input = fs::read_to_string(
+        &args
+            .next()
+            .expect("Please provide the path to the input file"),
+    )?;
+
+    part1(&input)?;
+
+    Ok(())
+}
+
+fn part1(input: &str) -> Result<()> {
+    let mut twice = 0;
+    let mut thrice = 0;
+
+    for line in input.lines() {
+        let mut seen: HashMap<char, u32> = HashMap::new();
+        for c in line.chars() {
+            *seen.entry(c).or_default() += 1;
+        }
+
+        if seen.values().any(|x| *x == 2) {
+            twice += 1;
+        }
+
+        if seen.values().any(|x| *x == 3) {
+            thrice += 1;
+        }
+    }
+
+    println!("{}", twice * thrice);
+
+    Ok(())
+}

Cargo.lock

@@ -4,3 +4,7 @@
 name = "aoc01"
 version = "0.1.0"
 
+[[package]]
+name = "aoc02"
+version = "0.1.0"
+

Cargo.toml

@@ -1,4 +1,5 @@
 [workspace]
 members = [
     "2018/aoc01",
+    "2018/aoc02",
 ]