80 lines
3.3 KiB
C#
80 lines
3.3 KiB
C#
namespace Day_02.Day_02
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{
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internal class Day02
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{
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private static string inputPath = "Day 02/day-02-input.txt";
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private static int Win = 6, Draw = 3, Lost = 0, Rock = 1, Paper = 2, Scissors = 3;
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private static string OpponentRock = "A", OpponentPaper = "B", OpponentScissors = "C",
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PlayRock = "X", PlayPaper = "Y", PlayScissors = "Z",
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PlayWin = "Z", PlayDraw = "Y", PlayLose = "X";
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private static Dictionary<string, int> PossibleScores;
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private static void BuildScoreDic()
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{
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if (PossibleScores == null)
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{
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PossibleScores = new Dictionary<string, int>();
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// Rock combos
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PossibleScores.Add(OpponentRock + " " + PlayPaper, Paper + Win); // win
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PossibleScores.Add(OpponentRock + " " + PlayRock, Rock + Draw); // draw
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PossibleScores.Add(OpponentRock + " " + PlayScissors, Scissors + Lost); // lose
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// Paper
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PossibleScores.Add(OpponentPaper + " " + PlayScissors, Scissors + Win); // win
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PossibleScores.Add(OpponentPaper + " " + PlayPaper, Paper + Draw); // draw
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PossibleScores.Add(OpponentPaper + " " + PlayRock, Rock + Lost); // lose
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// Scissors
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PossibleScores.Add(OpponentScissors + " " + PlayRock, Rock + Win); // win
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PossibleScores.Add(OpponentScissors + " " + PlayScissors, Scissors + Draw); // draw
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PossibleScores.Add(OpponentScissors + " " + PlayPaper, Paper + Lost); // lose
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}
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}
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private static void BuildWinDrawLoseTable()
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{
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if (PossibleScores == null)
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{
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PossibleScores = new Dictionary<string, int>();
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// Rock combos
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PossibleScores.Add(OpponentRock + " " + PlayWin, Paper + Win); // win
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PossibleScores.Add(OpponentRock + " " + PlayDraw, Rock + Draw); // draw
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PossibleScores.Add(OpponentRock + " " + PlayLose, Scissors + Lost); // lose
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// Paper
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PossibleScores.Add(OpponentPaper + " " + PlayWin, Scissors + Win); // win
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PossibleScores.Add(OpponentPaper + " " + PlayDraw, Paper + Draw); // draw
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PossibleScores.Add(OpponentPaper + " " + PlayLose, Rock + Lost); // lose
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// Scissors
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PossibleScores.Add(OpponentScissors + " " + PlayWin, Rock + Win); // win
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PossibleScores.Add(OpponentScissors + " " + PlayDraw, Scissors + Draw); // draw
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PossibleScores.Add(OpponentScissors + " " + PlayLose, Paper + Lost); // lose
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}
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}
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private static int GetScore(string input) => PossibleScores[input];
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internal static int GetPart1()
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{
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BuildScoreDic();
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return File.ReadAllLines(inputPath)
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.Select(GetScore)
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.Sum();
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}
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internal static int GetPart2()
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{
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BuildWinDrawLoseTable();
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return File.ReadAllLines(inputPath)
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.Select(GetScore)
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.Sum();
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}
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}
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}
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