查找表_leetcode205

# 解题思路：字典建立隐射关系,一一对应  20190302 找工作期间


class Solution(object):
    def isIsomorphic(self, s, t):
        """
        :type s: str
        :type t: str
        :rtype: bool
        """


        # 使用字典，pattern当key,str当value，形成配对
        dic = {}
     
        if len(s) != len(t) or len(set(s)) != len(set(t)):
            return False

        for i, val in enumerate(s):
             if val not in dic:
                    dic[val] = t[i]
             elif dic[val] != t[i]:
                    return False
        return True