820 - Short Encoding of Words.

Medium

A valid encoding of an array of words is any reference string s and array of indices indices such that:

• words.length == indices.length

• The reference string s ends with the '#' character.

• For each index indices[i], the substring of s starting from indices[i] and up to (but not including) the next '#' character is equal to words[i].

Given an array of words, return the length of the shortest reference string s possible of any valid encoding of words.

Example 1:

Input: words = "time", "me", "bell"

Output: 10

Explanation: A valid encoding would be s = "time#bell#" and indices = [0, 2, 5].

words0 = "time", the substring of s starting from indices0 = 0 to the next '#' is underlined in "time#bell#"

words1 = "me", the substring of s starting from indices1 = 2 to the next '#' is underlined in "time#bell#"

words2 = "bell", the substring of s starting from indices2 = 5 to the next '#' is underlined in "time#bell#"

Example 2:

Input: words = "t"

Output: 2

Explanation: A valid encoding would be s = "t#" and indices = 0.

Constraints:

• 1 <= words.length <= 2000

• 1 <= words[i].length <= 7

• words[i] consists of only lowercase letters.