public void Part2(string expectedResult, string input)
{
var codes = input.ToCharArray().Select(c => (int)c);
var rejoined = string.Join(",", codes);
var saltedInput = rejoined + "," + "17, 31, 73, 47, 23";
var splitCodes = saltedInput.SplitToIntegers(",").ToList();
var knot = new Knot();
for (var i = 0; i < 64; i++)
{
foreach (var length in splitCodes)
{
knot.Flip(length);
}
}
var hashSet = new List <int>();
var skip = 0;
Func <IList <int> > toHash = () =>
{
var next = knot.List.Skip(skip).Take(16);
skip += 16;
return(next.ToList());
};
while (skip < knot.MaxSize)
{
var next = toHash();
var hashPiece = 0;
foreach (var piece in next)
{
hashPiece = hashPiece ^ piece;
}
hashSet.Add(hashPiece);
}
var knotHashPieces = hashSet.Select(p =>
{
var piece = p.ToString("X");
if (piece.Length == 1)
{
piece = "0" + piece;
}
return(piece);
});
var knotHash = string.Join("", knotHashPieces);
Assert.AreEqual(expectedResult, knotHash.ToLower());
}
public void Part1(int expectedResult, string input)
{
var lengths = input.SplitToIntegers(",");
var knot = new Knot();
foreach (var length in lengths)
{
knot.Flip(length);
}
Assert.AreEqual(expectedResult, knot.MultiplyFirstTwo());
}
public void VerifyKnots(int expectFirst, int expectSecond, int startingLength, string inputLengths)
{
var lengths = inputLengths.SplitToIntegers(",");
var knot = new Knot(startingLength);
foreach (var length in lengths)
{
knot.Flip(length);
}
Assert.AreEqual(expectFirst, knot.List.First());
Assert.AreEqual(expectSecond, knot.List.Skip(1).First());
}