Given a string
s and a string array
dictionary, return the longest string in the dictionary that can be formed by deleting some of the given string characters. If there is more than one possible result, return the longest word with the smallest lexicographical order. If there is no possible result, return the empty string.
Input: s = "abpcplea", dictionary = ["ale","apple","monkey","plea"]
Because return the longest word with the smallest lexicographical order. So, I need sort dictionary first. Each of two arrays have a pointer. Base on dictionary array and check s string one by one to find the same as char of dictionary. Record the string of dictionary, if satisfaction condition. I compare and get the longest word of dictionary, then return it.