Day 2: Playing Rock Paper Scissors with elves

Author: Inusette

Advent_2022/src/main/java/Day02/Day02Main.java

@@ -1,21 +1,23 @@
 package Day02;
 
-import java.util.Collections;
 import java.util.List;
 
+import advent.utils.AdventFileUtils;
+
 public class Day02Main {
 
 	public static void main(String[] args) {
+		RockPaperScissorer rockPaperScissorer = new RockPaperScissorer();
+		List<String> stringList = getInput();
 
-		System.out.println("Here we go!");
-
-		// read input
-
-		// print puzzle solutions
+		int myTotalScore = rockPaperScissorer.playRockPaperScissors(stringList);
+		System.out.println("The score I thought I would get: " + myTotalScore);
 
+		int myPredefinedScore = rockPaperScissorer.playPredefinedRockPaperScissors(stringList);
+		System.out.println("The predefined score: " + myPredefinedScore);
 	}
 
-	protected static List<Integer> getInput() {
-		return Collections.emptyList();
+	protected static List<String> getInput() {
+		return AdventFileUtils.readInputIntoStringLines(Day02Main.class);
 	}
 }

Advent_2022/src/main/java/Day02/RockPaperScissorer.java

@@ -0,0 +1,59 @@
+package Day02;
+
+import java.util.List;
+import java.util.Map;
+
+/**
+ * @author Inna Pirina
+ * @since 02.12.2022
+ */
+public class RockPaperScissorer {
+
+	private final Map<String, Integer> elfScores = Map.of("A", 1, "B", 2, "C", 3);
+	private final Map<String, Integer> myScores = Map.of("X", 1, "Y", 2, "Z", 3);
+
+	private final Map<String, Integer> winningStrategy = Map.of("A", 2, "B", 3, "C", 1);
+	private final Map<String, Integer> losingStrategy = Map.of("A", 3, "B", 1, "C", 2);
+
+	private static final int WIN_SCORE = 6;
+	private static final int DRAW_SCORE = 3;
+
+	private static final String WIN = "Z";
+	private static final String DRAW = "Y";
+	private static final String LOSE = "X";
+
+	public int playRockPaperScissors(List<String> rounds) {
+		int myTotalScore = 0;
+		for (String round : rounds) {
+			String[] deals = round.trim().split(" ");
+			int elf = elfScores.get(deals[0]);
+			int me = myScores.get(deals[1]);
+			myTotalScore += me;
+
+			int difference = Math.abs(elf - me);
+			if ((me > elf && difference == 1) || (elf > me && difference == 2)) {
+				myTotalScore += WIN_SCORE;
+			} else if (me == elf) {
+				myTotalScore += DRAW_SCORE;
+			}
+		}
+		return myTotalScore;
+	}
+
+	public int playPredefinedRockPaperScissors(List<String> rounds) {
+		int myTotalScore = 0;
+		for (String round : rounds) {
+			String[] deals = round.trim().split(" ");
+			String elf = deals[0];
+			String me = deals[1];
+
+			switch (me) {
+			case WIN -> myTotalScore += WIN_SCORE + winningStrategy.get(elf);
+			case DRAW -> myTotalScore += DRAW_SCORE + elfScores.get(elf);
+			case LOSE -> myTotalScore += losingStrategy.get(elf);
+			default -> System.out.println("OH No!");
+			}
+		}
+		return myTotalScore;
+	}
+}