53 lines
1.1 KiB
C#
53 lines
1.1 KiB
C#
namespace AOC2015;
|
|
|
|
/// <summary>
|
|
/// Day 10: <see href="https://adventofcode.com/2015/day/10"/>
|
|
/// </summary>
|
|
public sealed class Day10 : Day
|
|
{
|
|
private string _seed;
|
|
|
|
public Day10() : base(2015, 10, "Puzzle Name")
|
|
{
|
|
_seed = Input.First();
|
|
}
|
|
|
|
public override object Part1()
|
|
{
|
|
for (var i = 0; i < 40; i++)
|
|
_seed = string.Concat(LookAndSay(_seed));
|
|
|
|
return _seed.Length;
|
|
}
|
|
|
|
public override object Part2()
|
|
{
|
|
for (var i = 0; i < 10; i++)
|
|
_seed = string.Concat(LookAndSay(_seed));
|
|
|
|
return _seed.Length;
|
|
}
|
|
|
|
public static IEnumerable<int> LookAndSay(string data)
|
|
{
|
|
var currentDigit = data[0];
|
|
int count = 1, place = 1;
|
|
|
|
while (place < data.Length)
|
|
{
|
|
if (data[place] == currentDigit) count++;
|
|
else
|
|
{
|
|
yield return count;
|
|
yield return currentDigit - '0';
|
|
currentDigit = data[place];
|
|
count = 1;
|
|
}
|
|
|
|
place++;
|
|
}
|
|
|
|
yield return count;
|
|
yield return currentDigit - '0';
|
|
}
|
|
} |