public bool IsValid()
{
int numberOfSantas = Santas[0].GetLength(0);
int numberOfDays = Santas.Length;
int numberOfVisits = VisitsDuration.Length;
return(true &&
Santas.All(day => day.GetLength(0) == numberOfSantas) &&
Santas.Zip(Visits, (a, b) => Tuple.Create(a, b)).All(e => e.Item1.GetLength(1) == e.Item2.GetLength(1)) &&
Santas.Length == numberOfDays &&
VisitsDuration.Length == numberOfVisits &&
Visits.All(v => v.GetLength(0) == numberOfVisits) &&
Distances.GetLength(0) == numberOfVisits &&
Distances.GetLength(1) == numberOfVisits
);
}