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This is a response to this brute-force version where the algorithm was not intended for review.

This is a response to this brute-force version where the algorithm was not intended for review.

private static int[][] getTriangle(Path source) throws IOException {
    try(Stream<String> lines = Files.lines(source)) {
        return lines.map(line -> line.trim())
                .filter(line -> !line.isEmpty())
                .map(level -> parseLevel(level))
                .toArray(sz -> new int[sz][]);
    }
}

private static int[] parseLevel(String level) {
    return Stream.of(level.trim().split("\\s+"))
                 .mapToInt(Integer::parseInt)
                 .toArray();
}

private static int[][] getTriangle(Path source) throws IOException {
    try(Stream<String> lines = Files.lines(source)) {
        return lines.map(String::trim)
                .filter(line -> !line.isEmpty())
                .map(level -> parseLevel(level))
                .toArray(sz -> new int[sz][]);
    }
}

private static int[] parseLevel(String level) {
    return Stream.of(level.split("\\s+"))
                 .mapToInt(Integer::parseInt)
                 .toArray();
}

I decided to use some Java 8-based idioms to parse and process the triangle.

I decided to use some Java 8-based idioms to parse and process the triangle. This is where I hope to get some focus for the review as well, whether there are better Java-8 ways to do this.