77 lines
2.2 KiB
Dart
77 lines
2.2 KiB
Dart
import "dart:io";
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import "package:args/command_runner.dart";
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class Day2Command 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 = "day2";
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@override
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final description = "Run Advent of Code 2025 Day 2";
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Day2Command() {
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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 filePath = argResults!.rest[0];
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print("Parsing file: $filePath");
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var inputFile = File(filePath);
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var openFile = await inputFile.readAsString();
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RegExp exp = RegExp(r'^([0-9]+)\1+$');
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var ids = openFile
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.trim()
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.split(',')
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.expand((range) {
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var extents = range.split('-');
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if (extents.length != 2) {
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throw Exception(
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"Expected range with 2 parts, but got ${extents.length} parts: {range}",
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);
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}
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var numRange = [int.parse(extents[0]), int.parse(extents[1])];
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List<int> createRange(int from, int to) =>
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List.generate(to - from + 1, (i) => i + from);
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return createRange(numRange[0], numRange[1]);
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})
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.map((id) => id.toString());
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var part1Answer = ids
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.where((id) => id.length.isEven)
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.where((id) {
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var firstHalf = id.substring(0, (id.length / 2).floor());
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var secondHalf = id.substring((id.length / 2).floor(), id.length);
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return firstHalf == secondHalf;
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})
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.map((id) => int.parse(id))
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.reduce((id1, id2) => id1 + id2);
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print("Part 1 Answer: $part1Answer");
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var part2Answer = ids
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.where((id) => exp.hasMatch(id))
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.map((id) {
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//print(id);
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return int.parse(id);
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})
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.reduce((id1, id2) => id1 + id2);
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print("Part 2 Answer: $part2Answer");
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}
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}
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