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Day10.cs
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Day10.cs
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using AdventOfCode.CSharp.Common;
using System;
namespace AdventOfCode.CSharp.Y2015.Solvers;
public class Day10 : ISolver
{
public static void Solve(ReadOnlySpan<byte> input, Solution solution)
{
input = input.TrimEnd((byte)'\n');
byte[] currentSequence = new byte[input.Length];
int curLength = input.Length;
for (int i = 0; i < input.Length; i++)
{
currentSequence[i] = (byte)(input[i] - '0');
}
int part1 = 0;
for (int i = 0; i < 50; i++)
{
if (i == 40)
{
part1 = curLength;
}
// maximum size
byte[] nextSequence = new byte[curLength * 2];
int nextLength = 0;
int curIndex = 0;
while (curIndex < curLength)
{
byte curVal = currentSequence[curIndex];
byte amount = 1;
for (int j = 1; j <= 2; j++)
{
if (curIndex + j >= curLength || currentSequence[curIndex + j] != curVal)
{
break;
}
amount++;
}
nextSequence[nextLength++] = amount;
nextSequence[nextLength++] = curVal;
curIndex += amount;
}
currentSequence = nextSequence;
curLength = nextLength;
}
solution.SubmitPart1(part1);
solution.SubmitPart2(curLength);
}
}