/// <summary>
/// Gets the maximum number of points for the reindeer at the specified time index.
/// </summary>
/// <param name="flightData">The reindeer flight data.</param>
/// <param name="timeIndex">The time index.</param>
/// <returns>
/// The maximum number of points for a reindeer at the time index specified by <paramref name="timeIndex"/>.
/// </returns>
internal static int GetMaximumPointsOfFastestReindeer(ICollection <string> flightData, int timeIndex)
{
var data = flightData
.Select((p) => FlightData.Parse(p))
.ToList();
var scoreboard = data.ToDictionary((p) => p.Name, (p) => 0);
for (int i = 1; i < timeIndex; i++)
{
// Find how far each reindeer is from the starting point
var distances = data.ToDictionary((p) => p.Name, (p) => p.GetDistanceAfterTimeIndex(i));
// Find the furthest distance away one or more reindeer are
int maxDistance = distances.Max((p) => p.Value);
// Award each reindeer who is that distance away a point
foreach (var reindeer in distances.Where((p) => p.Value == maxDistance))
{
scoreboard[reindeer.Key]++;
}
}
return(scoreboard
.Select((p) => p.Value)
.Max());
}
/// <summary>
/// Gets the maximum distance travelled by the specified reindeer at the specified time index.
/// </summary>
/// <param name="flightData">The reindeer flight data.</param>
/// <param name="timeIndex">The time index.</param>
/// <returns>
/// The maximum distance travelled by a reindeer at the time index specified by <paramref name="timeIndex"/>.
/// </returns>
internal static int GetMaximumDistanceOfFastestReindeer(ICollection <string> flightData, int timeIndex)
{
var data = flightData
.Select((p) => FlightData.Parse(p))
.ToList();
return(data
.Select((p) => p.GetDistanceAfterTimeIndex(timeIndex))
.Max());
}