Method letterToNum

hw0b/src/MapExercises.java:8–10

Returns a map from every lower case letter to the number corresponding to that letter, where 'a' is 1, 'b' is 2, 'c' is 3, ..., 'z' is 26.

()

     * 1, 'b' is 2, 'c' is 3, ..., 'z' is 26.
     */
    public static Map<Character, Integer> letterToNum() {
        return null;
    }

    /** Returns a map from the integers in the list to their squares. For example, if the input list
     *  is [1, 3, 6, 7], the returned map goes from 1 to 1, 3 to 9, 6 to 36, and 7 to 49.