Given a string A and a dictionary of words B, add spaces in A to construct a sentence where each word is a valid dictionary word.
Return all such possible sentences.
Note : Make sure the strings are sorted in your result.
The first argument is a string, A. The second argument is an array of strings, B.
Return a vector of strings representing the answer as described in the problem statement.
1 <= len(A) <= 50 1 <= len(B) <= 25 1 <= len(B[i]) <= 20
Input 1: A = "b" B = ["aabbb"] Output 1:  Input 1: A = "catsanddog", B = ["cat", "cats", "and", "sand", "dog"] Output 1: ["cat sand dog", "cats and dog"]
NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.