1408. String Matching in an Array

https://leetcode.com/problems/string-matching-in-an-array

Description

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.

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