0205-Isomorphic-Strings.py

'''
Given two strings s and t, determine if they are isomorphic.

Two strings are isomorphic if the characters in s can be replaced to get t.

All occurrences of a character must be replaced with another character while preserving the order of characters. No two characters may map to the same character but a character may map to itself.

Example 1:

Input: s = "egg", t = "add"
Output: true

Example 2:

Input: s = "foo", t = "bar"
Output: false

Example 3:

Input: s = "paper", t = "title"
Output: true

Note:
You may assume both s and t have the same length.
'''
class Solution:
    def isIsomorphic(self, s: str, t: str) -> bool:
        
        table_s, table_t = {}, {}
        
        for i in range(len(s)):
            
            if (s[i] in table_s and table_s[s[i]] != t[i]) or (t[i] in table_t and table_t[t[i]] != s[i]):
                return False
                
            table_s[s[i]], table_t[t[i]] = t[i], s[i]
            
        return True