static void Main(string[] args)
{
System.Console.WriteLine("Day 14");
string filename = @"Datasets\day14.txt";
Dictionary <string, Reaction> reaction = new Dictionary <string, Reaction>();
reaction.Add("ORE", new Reaction("ORE"));
using (StreamReader sr = new StreamReader(filename))
{
string[] data = sr.ReadToEnd().Trim().Split("\n");
foreach (string line in data)
{
string[] formula = line.Split("=>");
// result
string[] item = formula[1].Trim().Split(" ");
if (!reaction.ContainsKey(item[1]))
{
reaction.Add(item[1], new Reaction(item[1], Int64.Parse(item[0])));
}
Reaction result = reaction[item[1]];
result.Output = Int64.Parse(item[0]);
// sources
foreach (string s in formula[0].Split(","))
{
item = s.Trim().Split(" ");
result.AddSource(item[1], Int64.Parse(item[0]));
if (!reaction.ContainsKey(item[1]))
{
reaction.Add(item[1], new Reaction(item[1], 0)); // Skeleton reaction, to add product to
}
reaction[item[1]].AddProduct(result.Name, result.Output);
}
}
}
// Part 1
long requiredOre = GetRequiredOre(reaction);
System.Console.WriteLine($"1. {requiredOre}");
// Part 2
long target = 1_000_000_000_000;
long lower = (target / requiredOre) - 1_000;
long higher = (target / requiredOre) + 1_000_000_000;
while (lower < higher)
{
long mid = (lower + higher) / 2;
long guess = GetRequiredOre(reaction, mid);
if (guess > target)
{
// System.Console.WriteLine($"MORE: {guess}");
higher = mid;
}
else if (guess < target)
{
// System.Console.WriteLine($"LESS: {guess}");
if (mid == lower)
{
break;
}
lower = mid;
}
else
{
lower = mid;
break;
}
}
System.Console.WriteLine($"2. {lower}");
}
