Add year 2022 day2

Author: linl33

year2022/src/main/java/dev/linl33/adventofcode/year2022/Day2.java

@@ -0,0 +1,47 @@
+package dev.linl33.adventofcode.year2022;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.io.BufferedReader;
+import java.util.function.IntBinaryOperator;
+
+public class Day2 extends AdventSolution2022<Integer, Integer> {
+  public static void main(String[] args) {
+    new Day2().runAndPrintAll();
+  }
+
+  @Override
+  public Integer part1(@NotNull BufferedReader reader) {
+    return scoreStrategyGuide(
+        reader,
+        (p1, p2) -> {
+          // add 3 to make it positive
+          var outcome = (p2 - p1 + 1 + 3) % 3;
+          return scoreRound(outcome, p2);
+        }
+    );
+  }
+
+  @Override
+  public Integer part2(@NotNull BufferedReader reader) {
+    return scoreStrategyGuide(
+        reader,
+        (p1, outcome) -> {
+          var offset = outcome + 2;
+          var p2 = (p1 + offset) % 3;
+          return scoreRound(outcome, p2);
+        }
+    );
+  }
+
+  private static int scoreStrategyGuide(@NotNull BufferedReader reader, @NotNull IntBinaryOperator op) {
+    return reader
+        .lines()
+        .mapToInt(line -> op.applyAsInt(line.charAt(0) - 'A', line.charAt(2) - 'X'))
+        .sum();
+  }
+
+  private static int scoreRound(int outcome, int p2) {
+    return outcome * 3 + (p2 + 1);
+  }
+}