题目：

题解：

class Solution:
    def isIsomorphic(self, s: str, t: str) -> bool:
        dicts = Counter(s)
        dictt = Counter(t)        
        if list(dicts.values()) != list(dictt.values()):
            return False
    
        for i in range(len(s)):
            inds = list(dicts.keys()).index(s[i])
            if list(dictt.keys())[inds] != t[i]:
                return False
        return True