Hi, here’s your problem today. This problem was recently asked by Twitter:

Find all words that are concatenations of a list.

Input: [“tech”, “lead”, “techlead”, “cat”, “cats”, “dog”, “catsdog”]

Output: [‘techlead’, ‘catsdog’]

class Solution(object): def findAllConcatenatedWordsInADict(self, words): # Fill this in.

input = [“tech”, “lead”, “techlead”, “cat”, “cats”, “dog”, “catsdog”]

print(Solution().findAllConcatenatedWordsInADict(input))

Note: This question is classified as “hard.” HINT: Start with a brute-force solution.