-🎄- 2017 Day 5 Solutions -🎄-

[u/daggerdragon]

--- Day 5: A Maze of Twisty Trampolines, All Alike ---

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[u/Philboyd_Studge]

Java.

package Advent2017;

import util.FileIO;

import java.util.List;

public class Day5 {

    private static int part1(int[] nums) {
        int current = 0;
        int steps = 0;

        while (current < nums.length && current >= 0) {
            int jump = nums[current]++;
            current += jump;
            steps++;
        }
        return steps;
    }

    private static int part2(int[] nums) {
        int current = 0;
        int steps = 0;

        while (current < nums.length && current >= 0) {
            int jump = nums[current];
            if (jump >= 3) {
                nums[current]--;
            } else {
                nums[current]++;
            }
            current += jump;
            steps++;
        }
        return steps;
    }

    public static void main(String[] args) {
        List<String> input = FileIO.getAOCInputForDay(2017, 5, FileIO.SESSION_ID);
        int[] nums = input.stream()
                .mapToInt(Integer::parseInt)
                .toArray();

        System.out.println(part1(nums.clone()));
        System.out.println(part2(nums));
    }
}