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Ben Harris 2020-12-14 15:24:05 -05:00
parent ca34fdae9e
commit 9904a454a0
1 changed files with 8 additions and 15 deletions
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23
aoc2020/Day14.cs
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@ -9,11 +9,13 @@ namespace aoc2020
/// </summary>
public sealed class Day14 : Day
{
private readonly Dictionary<ulong, ulong> _writesDict;
private readonly Dictionary<ulong, ulong> _writes;
private readonly Dictionary<ulong, ulong> _writes2;
public Day14() : base(14)
{
_writesDict = new Dictionary<ulong, ulong>();
_writes = new Dictionary<ulong, ulong>();
_writes2 = new Dictionary<ulong, ulong>();
}
public override string Part1()
@ -21,22 +23,14 @@ namespace aoc2020
ulong mask = 0, bits = 0;
foreach (var line in Input)
{
if (line.StartsWith("mask = "))
{
var str = line.Split("mask = ", 2)[1];
mask = bits = 0;
for (var i = 35; i >= 0; --i)
{
if (str[35 - i] == 'X')
{
mask |= (ulong) 1 << i;
}
else if (str[35 - i] == '1')
{
bits |= (ulong) 1 << i;
}
}
else if (str[35 - i] == '1') bits |= (ulong) 1 << i;
}
else
{
@ -46,11 +40,10 @@ namespace aoc2020
.Select(ulong.Parse)
.ToArray();
_writesDict[spl[0]] = (spl[1] & mask) | bits;
_writes[spl[0]] = (spl[1] & mask) | bits;
}
}
return $"{_writesDict.Aggregate<KeyValuePair<ulong, ulong>, ulong>(0, (current, w) => current + w.Value)}";
return $"{_writes.Aggregate<KeyValuePair<ulong, ulong>, ulong>(0, (current, w) => current + w.Value)}";
}
public override string Part2()
@ -58,4 +51,4 @@ namespace aoc2020
return "";
}
}
}
}