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day 14 part 1
continuous-integration/drone/push Build is passing Details

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Ben Harris 2020-12-14 14:27:14 -05:00
parent 97b58586dd
commit ca34fdae9e
2 changed files with 41 additions and 1 deletions
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1
aoc2020.test/DayTests.cs
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@ -21,6 +21,7 @@ namespace aoc2020.test
[DataRow(typeof(Day11), "2303", "2057")]
[DataRow(typeof(Day12), "1710", "62045")]
[DataRow(typeof(Day13), "171", "539746751134958")]
[DataRow(typeof(Day14), "17481577045893", "")]
public void CheckAllDays(Type dayType, string part1, string part2)
{
// create day instance

41
aoc2020/Day14.cs
View File

@ -1,3 +1,7 @@
using System;
using System.Collections.Generic;
using System.Linq;
namespace aoc2020
{
/// <summary>
@ -5,13 +9,48 @@ namespace aoc2020
/// </summary>
public sealed class Day14 : Day
{
private readonly Dictionary<ulong, ulong> _writesDict;
public Day14() : base(14)
{
_writesDict = new Dictionary<ulong, ulong>();
}
public override string Part1()
{
return "";
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
{
var spl = line.Split(new[] {'[', ']', '='},
StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries)
.Skip(1)
.Select(ulong.Parse)
.ToArray();
_writesDict[spl[0]] = (spl[1] & mask) | bits;
}
}
return $"{_writesDict.Aggregate<KeyValuePair<ulong, ulong>, ulong>(0, (current, w) => current + w.Value)}";
}
public override string Part2()