Decrypt String from Alphabet to Integer Mapping LeetCode solution in C++

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class Solution {
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 public:
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  string freqAlphabets(string s) {
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    int n = s.size();
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    string ans = "";
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    for (int i = 0; i < n;) {
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      if (i + 2 < n && s[i + 2] == '#') {
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        ans += (s[i] - '0') * 10 + (s[i + 1] - '0') + 96;
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        i += 3;
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      } else {
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        ans += (s[i] - '0') + 96;
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        i++;
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      }
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    }
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    return ans;
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  }
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};