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Day03.cs
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Day03.cs
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var input = await File.ReadAllLinesAsync(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Input\Day03.txt"));
var totalPriority = 0;
var priorityLookup = new Dictionary<char, int>();
for (var c = 'a'; c <= 'z'; c++)
{
priorityLookup.Add(c, c - 96);
}
for (var c = 'A'; c <= 'Z'; c++)
{
priorityLookup.Add(c, c - 38);
}
var bag1set = new HashSet<char>();
var bag2set = new HashSet<char>();
var bags = input.Split(Environment.NewLine);
for (int i = 0; i < bags.Length; i++)
{
var bag = bags[i];
// Part one
//var compartment1Items = new HashSet<char>();
//var compartment1 = bag[..(bag.Length / 2)];
//foreach (var item in compartment1)
//{
// compartment1Items.Add(item);
//}
//var compartment2 = bag[(bag.Length / 2)..];
//foreach (var item in compartment2)
//{
// if (compartment1Items.Contains(item))
// {
// totalPriority += priorityLookup[item];
// break;
// }
//}
// Part two
if (i % 3 == 0)
{
foreach (var item in bag)
{
bag1set.Add(item);
}
}
else if (i % 3 == 1)
{
foreach (var item in bag)
{
bag2set.Add(item);
}
}
else
{
foreach (var item in bag)
{
if (bag1set.Contains(item) && bag2set.Contains(item))
{
totalPriority += priorityLookup[item];
bag1set.Clear();
bag2set.Clear();
break;
}
}
}
}
Console.WriteLine(totalPriority);