Preguntas de entrevista para software development engineer compartidas por los candidatos
A string is received, which contains from 0 to N numbers. Print all the possible combination of valid words, mapping each number in the string to a character in the telephone keypad. Assume no 0 or 1's are provided, as they do not have characters in it. A function bool isValid(string) is provided, so you may know whether a word is considered valid.