day02-part2

day02.cls

public with sharing class day02 {

    public static Integer part2(List<String> puzzleInputLines) {
        Integer total = 0; 
        for(String line : puzzleInputLines) {
            Map<String, Integer> maxGameCubesByColor = new Map<String, Integer>();
            Integer gameNumber = Integer.valueOf(line.substring(line.indexOf(' ') + 1, line.indexOf(':')));
            String gameRounds = line.substring(line.indexOf(':') + 1, line.length());
            for(String round : gameRounds.split(';')) {
                for(String score : round.split(',')) {
                    String numberColor = score.trim();
                    Integer cubeNumber = Integer.valueOf(numberColor.substring(0,numberColor.indexOf(' ')));
                    String cubeColor = numberColor.substring(numberColor.indexOf(' ') + 1, numberColor.length());
                    
                    if(maxGameCubesByColor.get(cubeColor) == null) {
                        maxGameCubesByColor.put(cubeColor, cubeNumber);
                    }
                    // if new highest cube number, put in map
                    if(maxGameCubesByColor.get(cubeColor) < cubeNumber) {
                        maxGameCubesByColor.put(cubeColor, cubeNumber);
                    }
                }
            }
            total += powerOfMaxCubes(maxGameCubesByColor);
        }

        return total;
    }

    private static Integer powerOfMaxCubes(Map<String, Integer> maxGameCubesByColor) {
        Integer powerResult = maxGameCubesByColor.values()[0] * maxGameCubesByColor.values()[1] * maxGameCubesByColor.values()[2];
        return powerResult;
    }
}