0890. Find and Replace Pattern

https://leetcode.com/problems/find-and-replace-pattern

Description

Given a list of strings words and a string pattern, return a list of words[i] that match pattern. You may return the answer in any order.

A word matches the pattern if there exists a permutation of letters p so that after replacing every letter x in the pattern with p(x), we get the desired word.

Recall that a permutation of letters is a bijection from letters to letters: every letter maps to another letter, and no two letters map to the same letter.

Example 1:

**Input:** words = ["abc","deq","mee","aqq","dkd","ccc"], pattern = "abb"
**Output:** ["mee","aqq"]
**Explanation:** "mee" matches the pattern because there is a permutation {a -> m, b -> e, ...}. 
"ccc" does not match the pattern because {a -> c, b -> c, ...} is not a permutation, since a and b map to the same letter.

Example 2:

**Input:** words = ["a","b","c"], pattern = "a"
**Output:** ["a","b","c"]

Constraints:

• 1 <= pattern.length <= 20

• 1 <= words.length <= 50

• words[i].length == pattern.length

• pattern and words[i] are lowercase English letters.

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