public string SolveSecondStar(StreamReader reader)
{
var rulesMap = BuildRulesMap(reader);
reader.ReadLine();
var yourTicket = StringParsers.SplitDelimitedStringIntoIntList(reader.ReadLine(), ",".ToCharArray());
reader.ReadLine();
reader.ReadLine();
var line = reader.ReadLine();
var nearbyTickets = new List <List <int> >();
while (!string.IsNullOrWhiteSpace(line))
{
var nearbyTicket = StringParsers.SplitDelimitedStringIntoIntList(line, ",".ToCharArray());
if (GetTicketErrorRate(nearbyTicket, rulesMap) == 0)
{
nearbyTickets.Add(nearbyTicket);
}
line = reader.ReadLine();
}
var possibleIndices = GetPossibleIndices(nearbyTickets, rulesMap);
var indexMap = MatchFieldsToIndices(possibleIndices);
long productToReturn = 1;
foreach (var field in indexMap.Keys)
{
if (field.StartsWith("departure"))
{
var indexOfDepartureField = indexMap[field];
productToReturn *= yourTicket[indexOfDepartureField];
}
}
return(productToReturn.ToString());
}
public string SolveFirstStar(StreamReader reader)
{
var rulesMap = BuildRulesMap(reader);
reader.ReadLine();
var yourTicket = StringParsers.SplitDelimitedStringIntoIntList(reader.ReadLine(), ",".ToCharArray());
reader.ReadLine();
reader.ReadLine();
var line = reader.ReadLine();
long errorRate = 0;
while (!string.IsNullOrWhiteSpace(line))
{
var nearbyTicket = StringParsers.SplitDelimitedStringIntoIntList(line, ",".ToCharArray());
errorRate += GetTicketErrorRate(nearbyTicket, rulesMap);
line = reader.ReadLine();
}
return(errorRate.ToString());
}
public string SolveSecondStar(StreamReader reader)
{
var numbers = StringParsers.SplitDelimitedStringIntoIntList(reader.ReadLine(), ",".ToCharArray());
return(GetNthNumberSpoken(numbers, SecondStarN).ToString());
}