public int FirstAnswer()
{
var ord = Buslines
.OrderBy(x => TimeToNext(x));
return(ord.First() * TimeToNext(ord.First()));
}
public bool IsAnswer(long t)
{
bool answer = Buslines
.Zip(Diffs, (a, b) => (t + b) % a)
.All(x => x == 0);
return(answer);
}
public long SecondAnswer()
{
long seed = 0;
long step = Buslines.First();
int i = 1;
while (!IsAnswer(seed))
{
seed += step;
if (seed % Buslines.First() == 0 && (seed + Diffs[i]) % Buslines.ElementAt(i) == 0)
{
step = Buslines[0..(i + 1)].Select(x => Convert.ToInt64(x)).Aggregate((a, b) => a * b);
