royvanrijn

    /**
     * Takes a string with digits (max length 8) from "-9999999" to "99999999" and returns the integer value.
     * @param input
     * @return
     */
    private static int parseInteger(final String input) {

        byte[] bytes = input.getBytes();
        // Read String as long:
        long bits = UNSAFE.getLong(bytes, Unsafe.ARRAY_BYTE_BASE_OFFSET);

royvanrijn

/*
 *  Copyright 2023 The original authors
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software

royvanrijn

package com.royvanrijn.advent.aoc2023;

import java.math.BigInteger;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

royvanrijn

package com.royvanrijn.advent.aoc2023;

import java.math.BigInteger;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;

royvanrijn

package com.royvanrijn.advent.aoc2023;

import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

royvanrijn

package com.royvanrijn.advent.aoc2023;

import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

royvanrijn

package com.royvanrijn.advent.aoc2023;

import java.math.BigInteger;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Day8 {

royvanrijn

package com.royvanrijn.advent.aoc2023;

import java.math.BigInteger;

public class Day6 {

    public static void main(String[] args) throws Exception {
        new Day6().day6(); // No static context.
    }

royvanrijn

import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class Day5 {

    public static void main(String[] args) throws Exception {

royvanrijn

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

public class Day25 {
    public static void main(String[] args) throws Exception {
        new Day25().calculate();
    }

    public void calculate() throws Exception {