leetcode 判断两字符串是否同构实例讲解

class Solution:
    def isIsomorphic(self, s, t):
        """
        :type s: str
        :type t: str
        :rtype: bool
        """
        a = {}
        if len(set(s)) != len(set(t)):
            return False
        for i in range(len(s)):
            if s[i] not in a:
                a[s[i]] = t[i]
            else:
                if a[s[i]] != t[i]:
                    return False
            return True

class Solution:
    def isIsomorphic(self, s, t):
        """
        :type s: str
        :type t: str
        :rtype: bool
        """
        return len(set(zip(s,t))) == len(set(s)) == len(set(t))