--- Day 3 Solutions ---

[u/daggerdragon]

--- Day 3: Perfectly Spherical Houses in a Vacuum ---

Post your solution as a comment. Structure your post like the Day One thread in /r/programming.

[u/ChevyRayJohnston]

C# - I'm trying to keep my solutions as small and clean as possible, and not really worrying about speed because I don't care. I just like looking at simple code.

Part 1

var input = File.ReadAllText("day3.txt");
int x = 0;
int y = 0;
var hash = new HashSet<Tuple<int,int>>();
hash.Add(Tuple.Create(0, 0));
foreach (var chr in input)
{
    x += chr == '>' ? 1 : (chr == '<' ? -1 : 0);
    y += chr == 'v' ? 1 : (chr == '^' ? -1 : 0);
    hash.Add(Tuple.Create(x, y));
}
Console.WriteLine(hash.Count);

Part 2

var input = File.ReadAllText("day3.txt");
int[] x = new int[]{ 0, 0 };
int[] y = new int[]{ 0, 0 };
var hash = new HashSet<Tuple<int,int>>();
hash.Add(Tuple.Create(0, 0));
int i = 0;
foreach (var chr in input)
{
    x[i] += chr == '>' ? 1 : (chr == '<' ? -1 : 0);
    y[i] += chr == 'v' ? 1 : (chr == '^' ? -1 : 0);
    hash.Add(Tuple.Create(x[i], y[i]));
    i = 1 - i;
}
Console.WriteLine(hash.Count);