Advent of Code - 2025 - Day 12

var input = await File.ReadAllTextAsync("input.txt");
var blocks = input.Split($"{Environment.NewLine}{Environment.NewLine}");
var shapes = new int[6];

for (var i = 0; i < 6; i++)
{
    var block = blocks[..^1][i];
    shapes[i] = block.Count(c => c == '#');
}

var sections = blocks[^1].Split(Environment.NewLine).Select(s => s.Split(": ")).ToArray();
var part1 = 0;

foreach (var section in sections)
{
    var area = section[0].Split('x').Select(int.Parse).Aggregate(1, (a, b) => a * b);
    var coveredArea = 0;
    var requiredShapes = section[1].Split(" ").Select(int.Parse).ToArray();

    for (var j = 0; j < 6; j++)
    {
        coveredArea += requiredShapes[j] * shapes[j];
    }

    if (coveredArea <= area)
    {
        part1++;
    }
}

Console.WriteLine($"Part 1: {part1}");