Determine if String Halves Are Alike LeetCode solution in C++

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class Solution {
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 public:
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  bool halvesAreAlike(string s) {
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    unordered_set<char> set = {'a', 'e', 'i', 'o', 'u', 'A', 'I', 'E', 'O', 'U'};
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    int i = 0, j = s.size() / 2, cnt = 0;
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    while (j < s.size()) {
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      if (set.find(s[i]) != set.end()) cnt++;
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      if (set.find(s[j]) != set.end()) cnt--;
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      i++;
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      j++;
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    }
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    return cnt == 0;
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  }
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};