Day 1 Solution

rust/.gitignore

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+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb

rust/Cargo.toml

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+[package]
+name = "aoc2022"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

rust/make.sh

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+#!/bin/bash
+
+DIR="$(dirname "$0")"
+
+if cargo "$@"; then
+    [ -d "$DIR/target/debug" ] && cp -r "$DIR/resources" "$DIR/target/debug/resources"
+    [ -d "$DIR/target/release" ] && cp -r "$DIR/resources" "$DIR/target/release/resources"
+fi

rust/src/day1.rs

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+use std::fs::File;
+use std::io::BufReader;
+use std::io::BufRead;
+
+pub fn run() {
+    let file = File::open("resources/day1input.txt").expect("Input file not found.");
+    let reader = BufReader::new(file);
+    let mut calorie_totals: Vec<i64> = Vec::new();
+    let mut current_elf_calories = 0;
+
+    for line in reader.lines() {
+        let calories = line.unwrap().parse::<i64>().unwrap_or(0);
+        println!("Input calories: {:?}", calories);
+        if calories == 0 {
+            println!("Adding to current elf total: {:?}", current_elf_calories);
+            calorie_totals.push(current_elf_calories);
+            current_elf_calories = 0;
+        } else {
+            current_elf_calories += calories;
+        }
+    }
+
+    if current_elf_calories > 0 {
+        println!("Adding to current elf total: {:?}", current_elf_calories);
+        calorie_totals.push(current_elf_calories);
+        current_elf_calories = 0;
+    }
+
+    calorie_totals.sort();
+    calorie_totals.reverse();
+
+    assert!(calorie_totals.len() >= 3);
+    println!("Day 1 Part A Answer: {}", calorie_totals[0]);
+    println!("Day 1 Part B Answer: {}", calorie_totals[0] + calorie_totals[1] + calorie_totals[2]);
+
+}

rust/src/main.rs

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+mod day1;
+
+fn main() {
+    day1::run();
+}