边工作边刷题：70天一遍leetcode: day 31

Isomorphic Strings

要点：一道简单题，要点就是map不是bijection的，所以要用两个map来表示bijection

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