Delete Characters to Make Fancy String LeetCode solution in C++

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class Solution {
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 public:
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  string makeFancyString(string s) {
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    int cnt = 1;
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    string ans = "";
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    ans.push_back(s[0]);
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    for (int i = 1; i < s.length(); ++i) {
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      cnt = s[i] == s[i - 1] ? cnt + 1 : 1;
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      if (cnt < 3) {
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        ans.push_back(s[i]);
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      }
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    }
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    return ans;
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  }
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};
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}
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;