AOC 2020 Day 06

#load "xunit"
#load "AOC Connector"
#load "AOC 2d Array"

void Main()
{
    RunTests();  // Call RunTests() or press Alt+Shift+T to initiate testing.

    //get aoc data
    var aoc = new AdventOfCode(2020, 6);

    //solve A
    aoc.SubmitAnswer(SolveA(aoc.InputLines), Part.A);

    //solve B
    aoc.SubmitAnswer(SolveB(aoc.InputLines), Part.B);
}

public int SolveA(string[] input)
{
    return input.SplitInputOnDoubleBreak()
        .Select(x => x.Where(y => y != ' ') //grab all items not whitespace
            .Distinct().Count() //count the unique items
        ).Sum(); //total
}

public int SolveB(string[] input)
{
    return input.SplitInputOnDoubleBreak()
    .Sum(x =>
    (
        x.Replace(" ", "") //remove whitespaces
        .GroupBy(y => y) //count each answer
        .Count(y => y.Count() == x.Count(y => y == ' ') + 1)     //count the whitespace in in the original and + 1 is people count,
    ));
}

#region private::Tests
#region test data
string[] testData = new []
{
"abc",
"",
"a",
"b",
"c",
"",
"ab",
"ac",
"",
"a",
"a",
"a",
"a",
"",
"b",
};

#endregion
//tests
[Fact] void TestA() => Assert.Equal(11, SolveA(testData));
[Fact] void TestB() => Assert.Equal(6,  SolveB(testData));
#endregion