AdventOfCode/AdventOfCode.Solutions/2022/Day 08/Day08Part1.cs

namespace AdventOfCode.Solutions._2022
{
    public class Day08Part1 : Answerable
    {
        public override int Year { get; set; } = 2022;
        public override int Day { get; set; } = 8;
        public override int Part { get; set; } = 1;

        public override string GetAnswer(byte[] data)
        {
            string[] treeGrid = GetAsStringArray(data);

            int visibleTreeCount = 0;
            for (int row = 0; row < treeGrid.Length; row++)
            {
                for (int col = 0; col < treeGrid[row].Length; col++)
                {
                    char treeHeight = treeGrid[row][col];
                    bool visibleFromLeft = !Enumerable.Range(0, col).Any(leftIndex => treeGrid[row][leftIndex] >= treeHeight);
                    bool visibleFromRight = !Enumerable.Range(col + 1, treeGrid[row].Length - col - 1).Any(rightIndex => treeGrid[row][rightIndex] >= treeHeight);
                    bool visibleFromTop = !Enumerable.Range(0, row).Any(topIndex => treeGrid[topIndex][col] >= treeHeight);
                    bool visibleFromBottom = !Enumerable.Range(row + 1, treeGrid.Length - row - 1).Any(bottomIndex => treeGrid[bottomIndex][col] >= treeHeight);

                    if (visibleFromBottom || visibleFromLeft || visibleFromRight || visibleFromTop) visibleTreeCount++;
                }
            }

            return visibleTreeCount.ToString();
        }
    }
}