Initial solution

.gitignore

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+/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 = "day01"
+version = "0.1.0"

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]

src/main.rs

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+use std::fs::File;
+use std::io;
+use std::io::BufRead;
+use std::path::Path;
+
+fn main() {
+    let path = Path::new("input.txt");
+    let file = File::open(&path).expect("Could not find file");
+    let lines = io::BufReader::new(file).lines();
+    let mut totals = Vec::new();
+    let mut running_tot = 0;
+
+    for line in lines {
+        if let Ok(line) = line {
+            if line.is_empty() {
+                totals.push(running_tot);
+                running_tot = 0;
+            } else if let Ok(i) = line.parse::<i32>() {
+                running_tot += i;
+            }
+        }
+    }
+
+    totals.sort_unstable_by(|a, b| b.partial_cmp(a).unwrap());
+    let max = totals[0];
+    let total :i32 = totals.into_iter().take(3).sum();
+
+    println!("first answer {}", max);
+    println!("second answer {}", total);
+}