205. Isomorphic Strings

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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

# mapping 사용
# 없으면 등록, 있을때 다르면 False

class Solution:
    def isIsomorphic(self, s: str, t: str) -> bool:
        dict = {}
        
        for i in range(len(s)):
            if len(s) != len(t) :
                return False
            
            # Dict 에 없으면 등록
            if s[i] not in dict.keys():
                if t[i] not in dict.values():
                    dict[s[i]] = t[i]
                else : 
                    return False

            # 있을때 비교
            else:  
                if dict[s[i]] != t[i]:
                    return False
                
        return True