Check if All A's Appears Before All B's LeetCode solution in C++

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class Solution {
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 public:
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  bool checkString(string s) {
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    for (int i = 1; i < s.size(); i++) {
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      if (s[i - 1] == 'b' && s[i] == 'a') {
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        return false;
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      }
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    }
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    return true;
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  }
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};