Day 1 part 1 complete in Rust

Author: jameshulse

.gitignore

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+**/target

2020/day-1/Cargo.lock

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+[package]
+name = "day-1"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+itertools = "0.10.0"

2020/day-1/Cargo.toml

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2020/day-1/input.txt

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+use itertools::Itertools;
+use std::fs;
+
+fn main() {
+    println!("Hello, world!");
+
+    let lines = fs::read_to_string("input.txt").expect("Couldn't read input file.");
+    let mut combos = lines
+        .split("\n")
+        .map(|val| val.parse::<u32>().expect("Nope!"))
+        .combinations(2);
+
+    let result: Result<Vec<u32>, &str> = loop {
+        match combos.next() {
+            Some(val) if val[0] + val[1] == 2020 => break Ok(val),
+            Some(_) => continue,
+            None => break Err("Couldn't find matching pair"),
+        };
+    };
+
+    match result {
+        Ok(val) => {
+            println!("Found the combintation: {:?}", val);
+            println!("The result is: {:?}", val[0] * val[1]);
+        }
+        Err(e) => println!("{}", e),
+    }
+}