private int PositionAt(FireWall f, int delay)
{
int time = delay + f.Depth;
int position = time % (2 * (f.Severity - 1));
return(position);
}
string Firewall(string input, bool part2)
{
var inputs = input.Split('\n');
var firewalls = new List <FireWall>();
int maxDepth = 0;
int penalty = 0;
foreach (var i in inputs)
{
var depth = Convert.ToInt32(i.Substring(0, i.IndexOf(':')));
var severity = Convert.ToInt32(i.Substring(i.IndexOf(' ') + 1));
var f = new FireWall(depth, severity);
firewalls.Add(f);
maxDepth = depth;
}
if (part2)
{
int delay = 0;
while (true)
{
penalty = 0;
delay += 1;
foreach (var f in firewalls)
{
f.Position = PositionAt(f, delay);
if (f.Position == 0)
{
penalty += Math.Max(f.Depth, 1);
break;
}
}
if (penalty == 0)
{
penalty = delay;
break;
}
}
}
else
{
penalty = RunFirewalls(firewalls, maxDepth, part2);
}
return(penalty.ToString());
}
