aoc/AOC2021/Day01.cs

namespace AOC2021;

/// <summary>
/// Day 1: <a href="https://adventofcode.com/2021/day/1"/>
/// </summary>
public sealed class Day01 : Day
{
    private List<int>? _readings;

    public Day01() : base(2021, 1, "Sonar Sweep")
    {
    }

    public override void ProcessInput()
    {
        _readings = Input.Select(int.Parse).ToList();
    }

    public override object Part1() =>
        Enumerable.Range(0, _readings!.Count - 1).Count(i => _readings[i + 1] > _readings[i]);

    public override object Part2() =>
        Enumerable.Range(0, _readings!.Count - 3).Count(i => _readings[i + 3] > _readings[i]);
}