AOC2.java

package esperimentini;

import java.nio.file.Files;
import java.nio.file.Path;

public class AOC2 {

	public static String FIRST = "ABC"; 
	public static String SECOND = "XYZ"; 
			
	public static void main(String[] args) throws Exception {

		var list = Files.readAllLines(Path.of("input2.txt"));
		var tok = list
				.stream()
				.map(s -> s.split(" "))
				.map(s -> new int[]{FIRST.indexOf(s[0]), SECOND.indexOf(s[1])})
				.toList();
				
		System.out.println(tok.stream().mapToLong(s -> score(s[0], s[1])).sum());
		System.out.println(tok.stream().mapToLong(s -> score2(s[0], s[1])).sum());
		
	}
	private static long score2(int v1, int v2)
	{
		v2 = ( v2 == 1 ? v1 : (v2 == 0 ? v1+2 : v1+1) ) % 3; 
		
		int sc = v1 == v2 ? 3 :	( (v1+3 - v2)%3==2 ? 6 : 0);
		
		return sc+ v2 + 1;
	}
	private static long score(int v1, int v2)
	{
		int sc = v1 == v2 ? 3 : ( (v1+3 - v2)%3==2 ? 6 : 0);
		
		return sc+ v2 + 1;
	}

}