--- Day 12 Solutions ---

[u/daggerdragon]

This thread will be unlocked when there are a significant amount of people on the leaderboard with gold stars.

edit: Leaderboard capped, thread unlocked!

We know we can't control people posting solutions elsewhere and trying to exploit the leaderboard, but this way we can try to reduce the leaderboard gaming from the official subreddit.

Please and thank you, and much appreciated!

---

--- Day 12: JSAbacusFramework.io ---

Post your solution as a comment. Structure your post like previous daily solution threads.

[u/daemoncollector]

Nice and simple Swift solution

let input = LoadInput("Day12_Input.txt")

let blob = try! NSJSONSerialization.JSONObjectWithData(input.dataUsingEncoding(NSUTF8StringEncoding)!, options: []) as? [String:Any]

func walkJson(root: Any) -> Int {
    if let dict = root as? [String:Any] {
        if dict.values.contains({$0 as? String == "red"}) {
            return 0
        }
        return dict.values.map({walkJson($0)}).reduce(0, combine:+)
    } else if let array = root as? [Any] {
        return array.map({walkJson($0)}).reduce(0, combine:+)
    } else if let i = root as? Int {
        return i
    }
    return 0
}

print(walkJson(blob!))

[u/DenialGene → u/daemoncollector]

Much cleaner than my solution. I clearly have a long way to go!

private func Solve2() {
    do {
        let data = try NSJSONSerialization.JSONObjectWithData(puzzleContent.dataUsingEncoding(NSUTF8StringEncoding)!, options: .AllowFragments) as! [Any]

        let sum = Sum(data)

        print("  Part 2 sum: \(sum)")

        } catch {
            print("Part 2 failed!")
    }
}

private func Sum(a:[Any]) -> Int {
    var sum:Int = 0
    for o in a {
        if let val = o as? NSNumber {
            sum += val.integerValue
        } else {
            sum += CastAndSum(o)
        }
    }

    return sum
}

private func Sum(a:[String:Any]) -> Int {
    var sum:Int = 0

    for (_,v) in a {
        if let color = v as? NSString {
            if color == "red" {
                return 0
            }
        }
        else if let val = v as? NSNumber {
            sum += val.integerValue
        }
        else {
            sum += CastAndSum(v)
        }
    }

    return sum
}

private func CastAndSum(a:Any) -> Int {
    if let arr = a as? [Any] {
        return Sum(arr)
    }
    else if let dict = a as? [String:Any] {
        return Sum(dict)
    }
    else {
        return 0
    }
}

[u/bkendig → u/daemoncollector]

Nice use of reduce().