public override long SolvePart1()
{
foreach (string busId in busIds)
{
if (busId.Equals("x"))
{
continue;
}
BusTimestamp busTimestamp = null;
long busIdConverted = Convert.ToInt32(busId);
long currentTimestamp = busIdConverted;
while (busTimestamp == null)
{
if (currentTimestamp >= earliestTimestamp)
{
busTimestamp = new BusTimestamp(busIdConverted, currentTimestamp);
}
currentTimestamp += busIdConverted;
}
if (!availableTimestamps.ContainsKey(busTimestamp.Timestamp))
{
availableTimestamps.Add(busTimestamp.Timestamp, busTimestamp.BusId);
}
}
BusTimestamp earliestAvailableTimestamp = GetEarliestAvailableTimestamp();
return(earliestAvailableTimestamp.BusId * (earliestAvailableTimestamp.Timestamp - earliestTimestamp));
}
private BusTimestamp GetEarliestAvailableTimestamp()
{
BusTimestamp earliestAvailableTimestamp = null;
long currentTimestamp = earliestTimestamp;
while (earliestAvailableTimestamp == null)
{
if (availableTimestamps.ContainsKey(currentTimestamp))
{
earliestAvailableTimestamp = new BusTimestamp((long)availableTimestamps[currentTimestamp], currentTimestamp);
}
currentTimestamp++;
}
return(earliestAvailableTimestamp);
}
