Change Minimum Characters to Satisfy One of Three Conditions LeetCode solution in C++

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class Solution {
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 public:
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  int count(string &a, string &b) {
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    int ans = INT_MAX;
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    for (char c = 'a'; c < 'z'; c++) {
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      int cnt = 0;
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      for (char it : a) cnt += (it > c);
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      for (char it : b) cnt += (it <= c);
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      ans = min(ans, cnt);
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    }
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    return ans;
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  }
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  int minCharacters(string a, string b) {
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    int x = count(a, b), y = count(b, a);
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    int fans = INT_MAX;
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    for (char c = 'a'; c <= 'z'; c++) {
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      int cnt = 0;
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      for (char it : a) cnt += (it != c);
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      for (char it : b) cnt += (it != c);
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      fans = min(fans, cnt);
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    }
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    return min({x, y, fans});
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  }
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};