advent of code day 3 2022

adventday3.java

package org.example;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Arrays;
import java.util.Scanner;

public class AdventDay3 {
    public static int getLowerCasePriority(char c) {
        return c - 'a' + 1;
    }

    public static int getUpperCasePriority(char c) {
        return c - 'A' + 27;
    }

    public static int getCommonItemValue(String first, String sec, String third) {
        return first.chars()
                .filter((c) -> sec.chars().anyMatch((a) -> a == c) && third.chars().anyMatch((b) -> b == c))
                .map((c) -> Character.isUpperCase(c) ? getUpperCasePriority((char) c) : getLowerCasePriority((char) c))
                .findFirst().getAsInt();
    }

    public static void main(String[] args) throws FileNotFoundException {
        Scanner scan = new Scanner(new File("day3.txt"));
        int sum = 0;
        try {
            while (true) {
                sum += getCommonItemValue(scan.nextLine(), scan.nextLine(), scan.nextLine());
            }
        }
        catch (Exception ignored) {
            // eof
        }

        System.out.println(sum);
    }
}