public object Part2()
{
var mem = new Dictionary <ulong, ulong>();
Bitmask mask = null;
foreach (var i in Instructions)
{
if (i.Type == InstructionType.SetMask)
{
mask = (Bitmask)i.Value;
}
else if (i.Type == InstructionType.SetMemory)
{
var a = ((ulong index, ulong value))i.Value;
var indices = mask.MaskV2(a.index);
foreach (var i2 in indices)
{
if (mem.ContainsKey(i2))
{
mem[i2] = a.value;
}
else
{
mem.Add(i2, a.value);
}
}
}
}
var sum = (ulong)0;
foreach (var m in mem.Values)
{
sum += m;
}
return(sum);
}
