Isomorphic Strings LeetCode solution in C++

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class Solution {
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 public:
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  bool isIsomorphic(string s, string t) {
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    if (s.size() != t.size()) return false;
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    unordered_map<char, char> mp;
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    for (int i = 0; i < s.size(); i++) {
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      if (mp.find(s[i]) == mp.end()) {
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        for (auto it : mp) {
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          if (it.second == t[i]) return false;
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        }
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        mp[s[i]] = t[i];
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      } else {
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        if (mp[s[i]] != t[i]) return false;
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      }
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    }
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    return true;
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  }
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};