day 1

.gitignore

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+target/

day1/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day1"
+version = "0.1.0"

day1/Cargo.toml

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+[package]
+name = "day1"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day1/src/main.rs

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+use std::fs::File;
+use std::io::{BufReader, BufRead, Error, Read};
+
+fn main() -> Result<(), Error> {
+    let path = "input.txt";
+
+    let input = File::open(path)?;
+    let mut buffered = BufReader::new(input);
+
+    let mut biggest_value: i32 = 0;
+    let mut counter: i32 = 0;
+    let mut vec: Vec<i32> = Vec::new();
+    let mut p = buffered.by_ref().lines().peekable();
+
+    while let Some(i) = p.next() {
+        let number: i32 = i?.parse().unwrap_or(0);
+
+        counter = counter + number;
+
+        if number == 0 {
+            if counter > biggest_value { biggest_value = counter };
+            vec.push(counter);
+
+            counter = 0;
+        };
+
+    };
+    if counter > biggest_value { biggest_value = counter };
+    vec.push(counter);
+    vec.sort();
+
+    println!("{}", biggest_value);
+    let last3 = vec.as_slice()[vec.len()-3..].to_vec();
+    println!("{:?}", last3.iter().sum::<i32>());
+
+    Ok(())
+}