Advent of Code 2017 Day 1

Day1.java

package Advent2017;

import util.FileIO;
import util.Timer;

/**
 * @author /u/Philboyd_Studge
 */
public class Day1 {

    private static int part1(String s) {
        return solve(s, 1);
    }

    private static int part2(String s) {
        return solve(s, s.length() / 2);
    }

    private static int solve(String s, int dist) {
        int sum = 0;
        for (int i = 0; i < s.length(); i++) {
            int next = (i + dist) % s.length();
            if (s.charAt(i) == s.charAt(next)) {
                sum += val(s.charAt(i));
            }
        }
        return sum;
    }

    private static int val(char c) {
        return c ^ 0x30;
    }

    public static void main(String[] args) {

        Timer.startTimer();
        int result = FileIO.performIntActionOnLine("advent2017_day1.txt", Day1::part1);
        System.out.println("Part 1: " + result);
        int result2 = FileIO.performIntActionOnLine("advent2017_day1.txt", Day1::part2);
        System.out.println("Part 2: " + result2);
        System.out.println(Timer.endTimer());

    }
}