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| 1 | +using System.Net; |
| 2 | + |
| 3 | +namespace AdventOfCode._2022; |
| 4 | + |
| 5 | +public class Day02 |
| 6 | +{ |
| 7 | + List<(char, char)> input; |
| 8 | + |
| 9 | + public Day02() |
| 10 | + { |
| 11 | + input = File.ReadAllLines("Inputs/Day02.txt") |
| 12 | + .Select(line => line.Split(' ')) |
| 13 | + .Select(parts => (parts[0][0], parts[1][0])) |
| 14 | + .ToList(); |
| 15 | + } |
| 16 | + |
| 17 | + [Fact] |
| 18 | + public void Part1() |
| 19 | + { |
| 20 | + static int Result(char a, char b) => (a, b) switch |
| 21 | + { |
| 22 | + ('A', 'X') => 4, // Rock vs Rock |
| 23 | + ('A', 'Y') => 8, // Rock vs Paper |
| 24 | + ('A', 'Z') => 3, // Rock vs Scissors |
| 25 | + ('B', 'X') => 1, // Paper vs Rock |
| 26 | + ('B', 'Y') => 5, // Paper vs Paper |
| 27 | + ('B', 'Z') => 9, // Paper vs Scissors |
| 28 | + ('C', 'X') => 7, // Scissors vs Rock |
| 29 | + ('C', 'Y') => 2, // Scissors vs Paper |
| 30 | + ('C', 'Z') => 6, // Scissors vs Scissors |
| 31 | + _ => throw new ArgumentException("Invalid input") |
| 32 | + }; |
| 33 | + |
| 34 | + int answer = input.Sum(pair => Result(pair.Item1, pair.Item2)); |
| 35 | + Assert.Equal(14297, answer); |
| 36 | + } |
| 37 | + |
| 38 | + [Fact] |
| 39 | + public void Part2() |
| 40 | + { |
| 41 | + static int Result(char a, char b) => (a, b) switch |
| 42 | + { |
| 43 | + ('A', 'X') => 3, // Rock vs Scissors |
| 44 | + ('A', 'Y') => 4, // Rock vs Rock |
| 45 | + ('A', 'Z') => 8, // Rock vs Paper |
| 46 | + ('B', 'X') => 1, // Paper vs Rock |
| 47 | + ('B', 'Y') => 5, // Paper vs Paper |
| 48 | + ('B', 'Z') => 9, // Paper vs Scissors |
| 49 | + ('C', 'X') => 2, // Scissors vs Paper |
| 50 | + ('C', 'Y') => 6, // Scissors vs Scissors |
| 51 | + ('C', 'Z') => 7, // Scissors vs Rock |
| 52 | + _ => throw new ArgumentException("Invalid input") |
| 53 | + }; |
| 54 | + int answer = input.Sum(pair => Result(pair.Item1, pair.Item2)); |
| 55 | + Assert.Equal(10498, answer); |
| 56 | + } |
| 57 | +} |
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