LetterSet | Topcoder Archive

Problem Statement

Write a method which, given a String[] over the alphabet 'A'-'Z', figures out the set of letters that are not present in the String's and orders them alphabetically.

Definition

Class:: LetterSet
Method:: compliment
Parameters:: String[]
Returns:: String
Method signature:: String compliment(String[] str)
(be sure your method is public)

Constraints

str contains between 0 to 50 elements, inclusive.
Each element of str contains between 1 and 50 characters, inclusive.
Each element of str contains only the capital letters 'A'-'Z'.

Examples

{"A"}

Returns: "BCDEFGHIJKLMNOPQRSTUVWXYZ"

{"ACE", "LACE"}

Returns: "BDFGHIJKMNOPQRSTUVWXYZ"

{"X", "XYZ"}

Returns: "ABCDEFGHIJKLMNOPQRSTUVW"

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