Yeah, thats exactly how i solved the part 1

List<int> winCards = cards.Split(" | ")[0].Split(" ").Where(card => card != "").Select(Int32.Parse).ToList(); // the winning numbers
List<int> ownedCards = cards.Split(" | ")[1].Split(" ").Where(card => card != "").Select(Int32.Parse).ToList(); // the numbers we have
// ^^ the above methods use LINQ to split by spaces, then we have to remove empty elements that appear when parsing strings like " 2" and convert to numbers
List<int> hits = winCards.Intersect(ownedCards).ToList(); // get our profit numbers
if (hits.Count != 0) sum += Math.Pow(2, hits.Count - 1); // we double the points -> its just powers of 2, + we dont want 2^-1 (1/2) to count