Advent of Code 2017 - Day 4

Day4.java

package Advent2017;

import util.FileIO;
import util.Timer;

import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class Day4 {

    private static boolean part1(String[] s) {
        Set<String> set = new HashSet<>(Arrays.asList(s));
        return set.size() == s.length;
    }

    private static boolean part2(String[] s) {
        return noAnagrams(s);
    }

    private static boolean isAnagram(String s, String t) {
        char[] c = s.toCharArray();
        char[] d = t.toCharArray();
        Arrays.sort(c);
        Arrays.sort(d);
        return Arrays.equals(c, d);

    }

    private static boolean noAnagrams(String[] s) {
        for (int i = 0; i < s.length - 1; i++) {
            for (int j = i + 1; j < s.length; j++) {
                if (isAnagram(s[i], s[j])) {
                    return false;
                }
            }
        }
        return true;
    }

    public static void main(String[] args) {

        Timer.startTimer();
        List<String[]> input = FileIO.getFileLinesSplit("advent2017_day4.txt", "\\s+");

        long resultPart1 = input.stream()
                .filter(Day4::part1)
                .count();

        long resultPart2 = input.stream()
                .filter(Day4::part2)
                .count();

        System.out.println("Part 1: " + resultPart1);
        System.out.println("Part 2: " + resultPart2);
        System.out.println(Timer.endTimer());

    }
}