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.gitignore

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+/target
+
+
+# Added by cargo
+#
+# already existing elements were commented out
+
+#/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc-01"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "aoc-01"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/main.rs

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+use std::env;
+use std::fs;
+use std::io::{self, BufRead};
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    let filename = if args.len() > 1 {
+        &args[1]
+    } else {
+        "input.txt"
+    };
+
+    println!("Gonna load {}!", filename);
+
+    let file = fs::File::open(filename).unwrap();
+    let lines = io::BufReader::new(file).lines();
+
+    let mut max_cals: u32 = 0;
+    let mut cur_cals: u32 = 0;
+    for l in lines {
+        if let Ok(cals) = l.unwrap().parse::<u32>() {
+            cur_cals += cals;
+        } else {
+            max_cals = max_cals.max(cur_cals);
+            println!("new cals: {}, max so far: {}", cur_cals, max_cals);
+            cur_cals = 0;
+        };
+    }
+}