Add day01

day01/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day01"
+version = "0.1.0"

day01/Cargo.toml

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+[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]

day01/src/main.rs

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+use std::error;
+use std::fs::File;
+use std::io::BufRead;
+use std::io::BufReader;
+
+
+fn main() -> Result<(), Box<dyn error::Error>> {
+	let f = File::open("input.txt")?;
+	let reader = BufReader::new(f);
+
+	let mut sums: Vec<u32> = Vec::new();
+	let mut current_sum: u32 = 0;
+	for value in reader.lines() {
+		let value = value.unwrap();
+		if value == "" {
+			sums.push(current_sum);
+			current_sum = 0;
+		} else {
+			current_sum += value.parse::<u32>()?;
+		}
+	}
+	sums.push(current_sum);
+	sums.sort();
+	sums.reverse();
+	
+	println!("{:?}", sums[..3].iter().sum::<u32>());
+    Ok(())
+}