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Day02.cs
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Day02.cs
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using AdventOfCode.CSharp.Common;
using System;
namespace AdventOfCode.CSharp.Y2016.Solvers;
public class Day02 : ISolver
{
public static void Solve(ReadOnlySpan<byte> input, Solution solution)
{
const string part1Code = "123456789";
const string part2Code = "0010002340567890ABC000E00";
int part1x = 1, part1y = 1;
int part2x = 2, part2y = 2;
var part1Writer = solution.GetPart1Writer();
var part2Writer = solution.GetPart2Writer();
foreach (ReadOnlySpan<byte> line in input.SplitLines())
{
foreach (byte dir in line)
{
switch (dir)
{
case (byte)'L':
part1x = Math.Max(part1x - 1, 0);
part2x = Math.Max(part2x - 1, Math.Abs(2 - part2y));
break;
case (byte)'R':
part1x = Math.Min(part1x + 1, 2);
part2x = Math.Min(part2x + 1, 4 - Math.Abs(2 - part2y));
break;
case (byte)'U':
part1y = Math.Max(part1y - 1, 0);
part2y = Math.Max(part2y - 1, Math.Abs(2 - part2x));
break;
case (byte)'D':
part1y = Math.Min(part1y + 1, 2);
part2y = Math.Min(part2y + 1, 4 - Math.Abs(2 - part2x));
break;
}
}
part1Writer.Write(part1Code[part1x + 3 * part1y]);
part2Writer.Write(part2Code[part2x + 5 * part2y]);
}
// Put a newline at the end to signify end of output
part1Writer.Complete();
part2Writer.Complete();
}
}