Word Pattern

class Solution { func wordPattern(_ pattern: String, _ str: String) -> Bool { var dicChar = [Character : String]() var dicWord = [String : Character]() let words = str.split(separator: " ") if words.count != pattern.count { return false } for (char, word) in zip(pattern, words) { let w = "\(word)" if dicChar[char, default: w] != w { return false } dicChar[char] = w if dicWord[w, default: char] != char { return false } dicWord[w] = char } return true } }