890. Find and Replace Pattern

https://leetcode.com/problems/find_and_replace_pattern/

Python

class Solution:
    def findAndReplacePattern(self, words: List[str], pattern: str) -> List[str]:
        result = []
        
        for word in words:
            if len(word) != len(pattern):
                continue
            
            mapper, mapped = dict(), set()
            for i in range(len(pattern)):
                p, c = pattern[i], word[i]
                if p not in mapper:
                    if c in mapped:
                        break

                    mapper[p] = c
                    mapped.add(c)
                else:
                    if mapper[p] != c:
                        break
            else:
                result.append(word)
        
        return result