Given a list of words, we may encode it by writing a reference string S and a list of indexes A.

For example, if the list of words is [“time”, “me”, “bell”], we can write it as S = “time#bell#” and indexes = [0, 2, 5].

Then for each index, we will recover the word by reading from the reference string from that index until we reach a “#” character.

What is the length of the shortest reference string S possible that encodes the given words?

Example:

Input: words = ["time", "me", "bell"]
Output: 10
Explanation: S = "time#bell#" and indexes = [0, 2, 5].

Note:

1 <= words.length <= 2000.
1 <= words[i].length <= 7.
Each word has only lowercase letters.

class Solution {
    public int minimumLengthEncoding(String[] words) {
        Set<String> good = new HashSet(Arrays.asList(words));
        for (String word: words) {
            for (int k = 1; k < word.length(); ++k)
                good.remove(word.substring(k));
        }

        int ans = 0;
        for (String word: good)
            ans += word.length() + 1;
        return