90 lines
2.1 KiB
Dart
90 lines
2.1 KiB
Dart
import "dart:convert";
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import "dart:io";
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import "package:args/command_runner.dart";
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enum Direction { left, right }
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class Rotation {
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Direction direction;
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int amount;
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Rotation(this.direction, this.amount);
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@override
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String toString() {
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return '{ direction: ${direction.name}, amount: $amount }';
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}
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}
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Future<List<Rotation>> parseInputFile(String filePath) async {
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var inputFile = File(filePath);
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var openFile = inputFile.openRead();
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var lines = openFile.transform(utf8.decoder).transform(LineSplitter());
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List<Rotation> inputList = [];
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await for (var line in lines) {
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var dir = line.substring(0, 1);
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var amount = int.parse(line.substring(1, line.length));
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inputList.add(
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Rotation(dir == 'L' ? Direction.left : Direction.right, amount),
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);
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}
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return inputList;
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}
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class Day1Command extends Command {
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// The [name] and [description] properties must be defined by every
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// subclass.
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@override
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final name = "day1";
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@override
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final description = "Run Advent of Code 2025 Day 1";
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Day1Command() {
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// we can add command specific arguments here.
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// [argParser] is automatically created by the parent class.
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}
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// [run] may also return a Future.
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@override
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Future<void> run() async {
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// [argResults] is set before [run()] is called and contains the flags/options
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// passed to this command.
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if (argResults!.rest.length != 1) {
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print(
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"Expected 1 positional arguments, found ${argResults!.rest.length}",
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);
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}
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var fileName = argResults!.rest[0];
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print("Parsing file: $fileName");
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var list = await parseInputFile(fileName);
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int dialValue = 50;
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int combination = 0;
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for (var instruction in list) {
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switch (instruction.direction) {
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case Direction.left:
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// Dial counter-clockwise by amount
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dialValue -= instruction.amount;
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case Direction.right:
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// Dial clockwise by amount
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dialValue += instruction.amount;
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}
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dialValue = dialValue % 100;
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if (dialValue == 0) {
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combination++;
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}
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}
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print("Combination: $combination");
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}
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}
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