pt 1

day2/.devcontainer/Dockerfile

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+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.205.2/containers/rust/.devcontainer/base.Dockerfile
+
+# [Choice] Debian OS version (use bullseye on local arm64/Apple Silicon): buster, bullseye
+ARG VARIANT="buster"
+FROM mcr.microsoft.com/vscode/devcontainers/rust:0-${VARIANT}
+
+# [Optional] Uncomment this section to install additional packages.
+# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+#     && apt-get -y install --no-install-recommends <your-package-list-here>

day2/.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.205.2/containers/rust
+{
+	"name": "Rust",
+	"build": {
+		"dockerfile": "Dockerfile",
+		"args": {
+			// Use the VARIANT arg to pick a Debian OS version: buster, bullseye
+			// Use bullseye when on local on arm64/Apple Silicon.
+			"VARIANT": "buster"
+		}
+	},
+	"runArgs": [
+		"--cap-add=SYS_PTRACE",
+		"--security-opt",
+		"seccomp=unconfined"
+	],
+
+	// Set *default* container specific settings.json values on container create.
+	"settings": {
+		"lldb.executable": "/usr/bin/lldb",
+		// VS Code don't watch files under ./target
+		"files.watcherExclude": {
+			"**/target/**": true
+		},
+		"rust-analyzer.checkOnSave.command": "clippy"
+	},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [
+		"vadimcn.vscode-lldb",
+		"mutantdino.resourcemonitor",
+		"matklad.rust-analyzer",
+		"tamasfe.even-better-toml",
+		"serayuzgur.crates"
+	],
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "rustc --version",
+
+	// Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+	"remoteUser": "vscode"
+}

day2/Cargo.toml

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+[package]
+name = "day2"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = "1.0.130"

day2/rust/Cargo.toml

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

day2/rust/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}

day2/src/main.rs

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+use std::fs;
+
+fn main() {
+    let input = fs::read_to_string("./input.txt").expect("Could not read file");
+
+    let commands: Vec<(&str, i32)> = input
+        .lines()
+        .map(|s| {
+            let mut split = s.split_whitespace();
+            (
+                split.next().unwrap(),
+                split.next().unwrap().parse::<i32>().unwrap(),
+            )
+        })
+        .collect();
+
+    part1(commands)
+}
+
+fn part1(commands: Vec<(&str, i32)>) {
+    let mut position = 0;
+    let mut depth = 0;
+
+    for (dir, amt) in commands.iter().map(|a| *a) {
+        let change = match dir {
+            "forward" => (amt, 0),
+            "up" => (0, -amt),
+            "down" => (0, amt),
+            _ => (0, 0),
+        };
+
+        position += change.0;
+        depth += change.1;
+    }
+    println!("Part 1: {}", position * depth);
+}