Advent of Code 2015/8 'Matchsticks'' in C# by encse

Space on the sleigh is limited this year, and so Santa will be bringing his list as a digital copy. He needs to know how much space it will take up when stored.

It is common in many programming languages to provide a way to escape special characters in strings. For example, C, JavaScript, Perl, Python, and even PHP handle special characters in very similar ways.

Read the full puzzle.

using System.Linq;
using System.Text.RegularExpressions;

namespace AdventOfCode.Y2015.Day08;

[ProblemName("Matchsticks")]
class Solution : Solver {

    public object PartOne(string input) =>
        (from line in input.Split('\n')
         let u = Regex.Unescape(line.Substring(1, line.Length - 2))
         select line.Length - u.Length).Sum();


    public object PartTwo(string input) =>
        (from line in input.Split('\n')
        let u = "\"" + line.Replace("\\", "\\\\").Replace("\"", "\\\"") + "\""
        select u.Length - line.Length).Sum();

}

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