A C# Dictionary Version


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    public bool IsIsomorphic(string s, string t) {
        Dictionary<char, char> dict = new Dictionary<char, char>();
        for(int i = 0; i < s.Length; i++)
            if(dict.ContainsKey(s[i]) && dict[s[i]] != t[i]) return false;
            else if (!dict.ContainsKey(s[i]) && dict.ContainsValue(t[i])) return false;
            else if (!dict.ContainsKey(s[i]) && !dict.ContainsValue(s[i])) dict.Add(s[i], t[i]);
        return true;
    }

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