1408 - String Matching in an Array\.

Easy

Given an array of string words. Return all strings in words which is substring of another word in any order.

String words[i] is substring of words[j], if can be obtained removing some characters to left and/or right side of words[j].

Example 1:

Input: words = "mass","as","hero","superhero"

Output: "as","hero"

Explanation: "as" is substring of "mass" and "hero" is substring of "superhero". "hero","as" is also a valid answer.

Example 2:

Input: words = "leetcode","et","code"

Output: "et","code"

Explanation: "et", "code" are substring of "leetcode".

Example 3:

Input: words = "blue","green","bu"

Output: []

Constraints:

• 1 <= words.length <= 100

• 1 <= words[i].length <= 30

• words[i] contains only lowercase English letters.

• It's guaranteed that words[i] will be unique.