//: Playground - noun: a place where people can play
// https://repl.it/@sdrew/FogCreek-Application-Problem-Swift

import UIKit

let alphabet: Array<Character> = Array("abcdefghijklmnopqrstuvwxyz_")
var dict: Dictionary<Character, Int> = Dictionary(uniqueKeysWithValues: zip(alphabet, Array(repeatElement(0, count: alphabet.count))))

let dataPath: String? = Bundle.main.path(forResource: "data", ofType: "txt");
let data: String = try String.init(contentsOfFile: dataPath!)

for char: Character in Array(data) {
    let prevVal: Int? = dict[char]
    if (prevVal != nil) { dict[char] = 1 + prevVal! }
}

var sorted: Array<Character> = Array(dict.keys).sorted { (a, b) -> Bool in
    return dict[a]! > dict[b]!
}

let word: String.SubSequence = String(sorted).split(separator: Character("_")).first!