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Cargo.toml

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+[package]
+name = "advent-of-code-2020"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+bench = false
+
+[dependencies]
+rust-crypto = "*"
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input/2020/day1.txt

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+1945
+2004
+1520
+1753
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+1976
+1994
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src/day1.rs

@@ -0,0 +1,11 @@
+use itertools::Itertools;
+
+#[aoc_generator(day1, part1)]
+pub fn generator_p1(input: &str) -> Vec<u32> {
+    input.lines().map(|l| l.parse().unwrap()).collect()
+}
+
+#[aoc(day1, part1)]
+pub fn solve_p1(input: &[u32]) -> u32 {
+    input.iter().permutations(2).find(|v| v[0] + v[1] == 2020).unwrap().iter().map(|a| a.clone()).product()
+}

src/lib.rs

@@ -0,0 +1,7 @@
+#[macro_use]
+extern crate aoc_runner_derive;
+extern crate aoc_runner;
+
+pub mod day1;
+
+aoc_lib!{ year = 2020 }

src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}