first 2 days

.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 = "rustadventofcode"
+version = "0.1.0"

Cargo.toml

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

src/day1.rs

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+use std::fs;
+
+pub fn step1() -> i32 {
+    let data = collect_data();
+    let elfdata = organise_data(data);
+    let highest = return_highest(elfdata);
+    return highest;
+}
+
+pub fn step2() -> i32 {
+    let data = collect_data();
+    let mut elfdata = organise_data(data);
+    elfdata.sort_by(|a, b| b.cmp(a));
+    let total = add_together(vec![elfdata[0], elfdata[1], elfdata[2]]);
+    return total;
+}
+
+fn add_together(data: Vec<i32>) -> i32 {
+    return data.iter().sum();
+}
+
+fn collect_data() -> Vec<String> {
+    let data = fs::read_to_string("src/day1/input.txt").expect("Unable to read file");
+    let eachline: Vec<String> = data.split("\n").map(str::to_string).collect();
+    return eachline;
+}
+
+fn organise_data(data: Vec<String>) -> Vec<i32> {
+    let mut elfscores: Vec<i32> = Vec::new();
+
+    let mut amount: i32 = 0;
+    for line in data {
+        if line.len() < 1 {
+            if amount > 0 {
+                elfscores.push(amount);
+                amount = 0;
+            }
+            continue;
+        }
+        amount += line.parse::<i32>().unwrap();
+    }
+
+    return elfscores;
+}
+
+fn return_highest(data: Vec<i32>) -> i32 {
+    return *data.iter().max().unwrap();
+}

src/day2.rs

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+use std::fs;
+
+fn collect_data() -> Vec<String> {
+    let data = fs::read_to_string("src/day2/input.txt").expect("Unable to read file");
+    let eachline: Vec<String> = data.split("\n").map(str::to_string).collect();
+    return eachline;
+}
+
+fn get_points_for_match(mat: &str) -> i32 {
+    let items: Vec<String> = mat.split(" ").map(str::to_string).collect();
+
+    let mut points = 0;
+
+    if items[1] == "X" {
+        points += 1;
+    } else if items[1] == "Y" {
+        points += 2;
+    } else if items[1] == "Z" {
+        points += 3;
+    }
+
+    if (items[0] == "C" && items[1] == "X")
+        || (items[0] == "B" && items[1] == "Z")
+        || (items[0] == "A" && items[1] == "Y")
+    {
+        points += 6
+    } else if (items[0] == "A" && items[1] == "Z")
+        || (items[0] == "C" && items[1] == "Y")
+        || (items[0] == "B" && items[1] == "X")
+    {
+        points += 0;
+    } else {
+        points += 3;
+    }
+
+    return points;
+}
+
+fn get_points_for_match_2(mat: &str) -> i32 {
+    let items: Vec<String> = mat.split(" ").map(str::to_string).collect();
+
+    let mut points = 0;
+
+    if items[1] == "Y" {
+        points += 3
+    } else if items[1] == "Z" {
+        points += 6;
+    }
+
+    if items[0] == "A" {
+        points += 2;
+    } else if items[0] == "B" {
+        points += 3;
+    } else if items[0] == "C" {
+        points += 1;
+    }
+
+    return points;
+}
+
+pub fn step1() -> i32 {
+    let items = collect_data();
+
+    let mut total = 0;
+    for item in items {
+        total += get_points_for_match(&item);
+    }
+
+    return total;
+}
+
+pub fn step2() -> i32 {
+    let items = collect_data();
+
+    let mut total = 0;
+    for item in items {
+        total += get_points_for_match_2(&item);
+    }
+
+    return total;
+}

src/main.rs

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+mod day1;
+mod day2;
+
+fn main() {
+    println!(
+        "The answer to day 1 task 1 is: {}",
+        day1::step1().to_string()
+    );
+    println!("The answer to day 1 task 2 is: {}", day1::step2());
+
+    println!("The answer to day 2 task 1 is: {}", day2::step1());
+    println!("The answer to day 2 task 2 is: {}", day2::step2());
+}