Advent of Code 2022/6 'Tuning Trouble'' in C# by encse

The preparations are finally complete; you and the Elves leave camp on foot and begin to make your way toward the star fruit grove.

As you move through the dense undergrowth, one of the Elves gives you a handheld device. He says that it has many fancy features, but the most important one to set up right now is the communication system.

Read the full puzzle.

using System;
using System.Linq;

namespace AdventOfCode.Y2022.Day06;

[ProblemName("Tuning Trouble")]
class Solution : Solver {

    public object PartOne(string input) => StartOfBlock(input, 4);
    public object PartTwo(string input) => StartOfBlock(input, 14);

    // Slides a window of length l over the input and finds the first position
    // where each character is different. Returns the right end of the window.
    int StartOfBlock(string input, int l) =>
         Enumerable.Range(l, input.Length)
            .First(i => input.Substring(i - l, l).ToHashSet().Count == l);
}

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